Neurons: The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM.Neurons, Afferent: Neurons which conduct NERVE IMPULSES to the CENTRAL NERVOUS SYSTEM.Motor Neurons: Neurons which activate MUSCLE CELLS.Action Potentials: Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.Dopaminergic Neurons: Neurons whose primary neurotransmitter is DOPAMINE.GABAergic Neurons: Neurons whose primary neurotransmitter is GAMMA-AMINOBUTYRIC ACID.Patch-Clamp Techniques: An electrophysiologic technique for studying cells, cell membranes, and occasionally isolated organelles. All patch-clamp methods rely on a very high-resistance seal between a micropipette and a membrane; the seal is usually attained by gentle suction. The four most common variants include on-cell patch, inside-out patch, outside-out patch, and whole-cell clamp. Patch-clamp methods are commonly used to voltage clamp, that is control the voltage across the membrane and measure current flow, but current-clamp methods, in which the current is controlled and the voltage is measured, are also used.Electrophysiology: The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.Hippocampus: A curved elevation of GRAY MATTER extending the entire length of the floor of the TEMPORAL HORN of the LATERAL VENTRICLE (see also TEMPORAL LOBE). The hippocampus proper, subiculum, and DENTATE GYRUS constitute the hippocampal formation. Sometimes authors include the ENTORHINAL CORTEX in the hippocampal formation.Synapses: Specialized junctions at which a neuron communicates with a target cell. At classical synapses, a neuron's presynaptic terminal releases a chemical transmitter stored in synaptic vesicles which diffuses across a narrow synaptic cleft and activates receptors on the postsynaptic membrane of the target cell. The target may be a dendrite, cell body, or axon of another neuron, or a specialized region of a muscle or secretory cell. Neurons may also communicate via direct electrical coupling with ELECTRICAL SYNAPSES. Several other non-synaptic chemical or electric signal transmitting processes occur via extracellular mediated interactions.Ganglia, Spinal: Sensory ganglia located on the dorsal spinal roots within the vertebral column. The spinal ganglion cells are pseudounipolar. The single primary branch bifurcates sending a peripheral process to carry sensory information from the periphery and a central branch which relays that information to the spinal cord or brain.Axons: Nerve fibers that are capable of rapidly conducting impulses away from the neuron cell body.Cells, Cultured: Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.Synaptic Transmission: The communication from a NEURON to a target (neuron, muscle, or secretory cell) across a SYNAPSE. In chemical synaptic transmission, the presynaptic neuron releases a NEUROTRANSMITTER that diffuses across the synaptic cleft and binds to specific synaptic receptors, activating them. The activated receptors modulate specific ion channels and/or second-messenger systems in the postsynaptic cell. In electrical synaptic transmission, electrical signals are communicated as an ionic current flow across ELECTRICAL SYNAPSES.Dendrites: Extensions of the nerve cell body. They are short and branched and receive stimuli from other NEURONS.Sensory Receptor Cells: Specialized afferent neurons capable of transducing sensory stimuli into NERVE IMPULSES to be transmitted to the CENTRAL NERVOUS SYSTEM. Sometimes sensory receptors for external stimuli are called exteroceptors; for internal stimuli are called interoceptors and proprioceptors.Olfactory Receptor Neurons: Neurons in the OLFACTORY EPITHELIUM with proteins (RECEPTORS, ODORANT) that bind, and thus detect, odorants. These neurons send their DENDRITES to the surface of the epithelium with the odorant receptors residing in the apical non-motile cilia. Their unmyelinated AXONS synapse in the OLFACTORY BULB of the BRAIN.Electric Stimulation: Use of electric potential or currents to elicit biological responses.Nerve Tissue ProteinsCholinergic Neurons: Neurons whose primary neurotransmitter is ACETYLCHOLINE.Spinal Cord: A cylindrical column of tissue that lies within the vertebral canal. It is composed of WHITE MATTER and GRAY MATTER.Cerebral Cortex: The thin layer of GRAY MATTER on the surface of the CEREBRAL HEMISPHERES that develops from the TELENCEPHALON and folds into gyri and sulchi. It reaches its highest development in humans and is responsible for intellectual faculties and higher mental functions.gamma-Aminobutyric Acid: The most common inhibitory neurotransmitter in the central nervous system.Membrane Potentials: The voltage differences across a membrane. For cellular membranes they are computed by subtracting the voltage measured outside the membrane from the voltage measured inside the membrane. They result from differences of inside versus outside concentration of potassium, sodium, chloride, and other ions across cells' or ORGANELLES membranes. For excitable cells, the resting membrane potentials range between -30 and -100 millivolts. Physical, chemical, or electrical stimuli can make a membrane potential more negative (hyperpolarization), or less negative (depolarization).Neural Inhibition: The function of opposing or restraining the excitation of neurons or their target excitable cells.Neurons, Efferent: Neurons which send impulses peripherally to activate muscles or secretory cells.Motor Neuron Disease: Diseases characterized by a selective degeneration of the motor neurons of the spinal cord, brainstem, or motor cortex. Clinical subtypes are distinguished by the major site of degeneration. In AMYOTROPHIC LATERAL SCLEROSIS there is involvement of upper, lower, and brainstem motor neurons. In progressive muscular atrophy and related syndromes (see MUSCULAR ATROPHY, SPINAL) the motor neurons in the spinal cord are primarily affected. With progressive bulbar palsy (BULBAR PALSY, PROGRESSIVE), the initial degeneration occurs in the brainstem. In primary lateral sclerosis, the cortical neurons are affected in isolation. (Adams et al., Principles of Neurology, 6th ed, p1089)Models, Neurological: Theoretical representations that simulate the behavior or activity of the neurological system, processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.Animals, Newborn: Refers to animals in the period of time just after birth.Pyramidal Cells: Projection neurons in the CEREBRAL CORTEX and the HIPPOCAMPUS. Pyramidal cells have a pyramid-shaped soma with the apex and an apical dendrite pointed toward the pial surface and other dendrites and an axon emerging from the base. The axons may have local collaterals but also project outside their cortical region.Immunohistochemistry: Histochemical localization of immunoreactive substances using labeled antibodies as reagents.Medulla Oblongata: The lower portion of the BRAIN STEM. It is inferior to the PONS and anterior to the CEREBELLUM. Medulla oblongata serves as a relay station between the brain and the spinal cord, and contains centers for regulating respiratory, vasomotor, cardiac, and reflex activities.Dopamine: One of the catecholamine NEUROTRANSMITTERS in the brain. It is derived from TYROSINE and is the precursor to NOREPINEPHRINE and EPINEPHRINE. Dopamine is a major transmitter in the extrapyramidal system of the brain, and important in regulating movement. A family of receptors (RECEPTORS, DOPAMINE) mediate its action.Excitatory Postsynaptic Potentials: Depolarization of membrane potentials at the SYNAPTIC MEMBRANES of target neurons during neurotransmission. Excitatory postsynaptic potentials can singly or in summation reach the trigger threshold for ACTION POTENTIALS.Interneurons: Most generally any NEURONS which are not motor or sensory. Interneurons may also refer to neurons whose AXONS remain within a particular brain region in contrast to projection neurons, which have axons projecting to other brain regions.Mesencephalon: The middle of the three primitive cerebral vesicles of the embryonic brain. Without further subdivision, midbrain develops into a short, constricted portion connecting the PONS and the DIENCEPHALON. Midbrain contains two major parts, the dorsal TECTUM MESENCEPHALI and the ventral TEGMENTUM MESENCEPHALI, housing components of auditory, visual, and other sensorimoter systems.Brain: The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.Neuropeptides: Peptides released by NEURONS as intercellular messengers. Many neuropeptides are also hormones released by non-neuronal cells.Serotonergic Neurons: Neurons whose primary neurotransmitter is SEROTONIN.Cats: The domestic cat, Felis catus, of the carnivore family FELIDAE, comprising over 30 different breeds. The domestic cat is descended primarily from the wild cat of Africa and extreme southwestern Asia. Though probably present in towns in Palestine as long ago as 7000 years, actual domestication occurred in Egypt about 4000 years ago. (From Walker's Mammals of the World, 6th ed, p801)Rats, Wistar: A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain.Glutamic Acid: A non-essential amino acid naturally occurring in the L-form. Glutamic acid is the most common excitatory neurotransmitter in the CENTRAL NERVOUS SYSTEM.Time Factors: Elements of limited time intervals, contributing to particular results or situations.Tetrodotoxin: An aminoperhydroquinazoline poison found mainly in the liver and ovaries of fishes in the order TETRAODONTIFORMES, which are eaten. The toxin causes paresthesia and paralysis through interference with neuromuscular conduction.Brain Stem: The part of the brain that connects the CEREBRAL HEMISPHERES with the SPINAL CORD. It consists of the MESENCEPHALON; PONS; and MEDULLA OBLONGATA.Tyrosine 3-Monooxygenase: An enzyme that catalyzes the conversion of L-tyrosine, tetrahydrobiopterin, and oxygen to 3,4-dihydroxy-L-phenylalanine, dihydrobiopterin, and water. EC 1.14.16.2.Ganglia, Invertebrate: Clusters of neuronal cell bodies in invertebrates. Invertebrate ganglia may also contain neuronal processes and non-neuronal supporting cells. Many invertebrate ganglia are favorable subjects for research because they have small numbers of functional neuronal types which can be identified from one animal to another.Nerve Net: A meshlike structure composed of interconnecting nerve cells that are separated at the synaptic junction or joined to one another by cytoplasmic processes. In invertebrates, for example, the nerve net allows nerve impulses to spread over a wide area of the net because synapses can pass information in any direction.Afferent Pathways: Nerve structures through which impulses are conducted from a peripheral part toward a nerve center.Mice, Inbred C57BLMice, Transgenic: Laboratory mice that have been produced from a genetically manipulated EGG or EMBRYO, MAMMALIAN.Neurites: In tissue culture, hairlike projections of neurons stimulated by growth factors and other molecules. These projections may go on to form a branched tree of dendrites or a single axon or they may be reabsorbed at a later stage of development. "Neurite" may refer to any filamentous or pointed outgrowth of an embryonal or tissue-culture neural cell.Nitrergic Neurons: Nerve cells where transmission is mediated by NITRIC OXIDE.Adrenergic Neurons: Neurons whose primary neurotransmitter is EPINEPHRINE.Cell Count: The number of CELLS of a specific kind, usually measured per unit volume or area of sample.Ganglia: Clusters of multipolar neurons surrounded by a capsule of loosely organized CONNECTIVE TISSUE located outside the CENTRAL NERVOUS SYSTEM.Calcium: A basic element found in nearly all organized tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.Neurogenesis: Formation of NEURONS which involves the differentiation and division of STEM CELLS in which one or both of the daughter cells become neurons.Neuronal Plasticity: The capacity of the NERVOUS SYSTEM to change its reactivity as the result of successive activations.Substantia Nigra: The black substance in the ventral midbrain or the nucleus of cells containing the black substance. These cells produce DOPAMINE, an important neurotransmitter in regulation of the sensorimotor system and mood. The dark colored MELANIN is a by-product of dopamine synthesis.Neuroglia: The non-neuronal cells of the nervous system. They not only provide physical support, but also respond to injury, regulate the ionic and chemical composition of the extracellular milieu, participate in the BLOOD-BRAIN BARRIER and BLOOD-RETINAL BARRIER, form the myelin insulation of nervous pathways, guide neuronal migration during development, and exchange metabolites with neurons. Neuroglia have high-affinity transmitter uptake systems, voltage-dependent and transmitter-gated ion channels, and can release transmitters, but their role in signaling (as in many other functions) is unclear.Ganglia, Sympathetic: Ganglia of the sympathetic nervous system including the paravertebral and the prevertebral ganglia. Among these are the sympathetic chain ganglia, the superior, middle, and inferior cervical ganglia, and the aorticorenal, celiac, and stellate ganglia.Thalamus: Paired bodies containing mostly GRAY MATTER and forming part of the lateral wall of the THIRD VENTRICLE of the brain.Cerebellum: The part of brain that lies behind the BRAIN STEM in the posterior base of skull (CRANIAL FOSSA, POSTERIOR). It is also known as the "little brain" with convolutions similar to those of CEREBRAL CORTEX, inner white matter, and deep cerebellar nuclei. Its function is to coordinate voluntary movements, maintain balance, and learn motor skills.Evoked Potentials: Electrical responses recorded from nerve, muscle, SENSORY RECEPTOR, or area of the CENTRAL NERVOUS SYSTEM following stimulation. They range from less than a microvolt to several microvolts. The evoked potential can be auditory (EVOKED POTENTIALS, AUDITORY), somatosensory (EVOKED POTENTIALS, SOMATOSENSORY), visual (EVOKED POTENTIALS, VISUAL), or motor (EVOKED POTENTIALS, MOTOR), or other modalities that have been reported.Physical Stimulation: Act of eliciting a response from a person or organism through physical contact.Nerve Degeneration: Loss of functional activity and trophic degeneration of nerve axons and their terminal arborizations following the destruction of their cells of origin or interruption of their continuity with these cells. The pathology is characteristic of neurodegenerative diseases. Often the process of nerve degeneration is studied in research on neuroanatomical localization and correlation of the neurophysiology of neural pathways.Nerve Growth Factors: Factors which enhance the growth potentialities of sensory and sympathetic nerve cells.Nociceptors: Peripheral AFFERENT NEURONS which are sensitive to injuries or pain, usually caused by extreme thermal exposures, mechanical forces, or other noxious stimuli. Their cell bodies reside in the DORSAL ROOT GANGLIA. Their peripheral terminals (NERVE ENDINGS) innervate target tissues and transduce noxious stimuli via axons to the CENTRAL NERVOUS SYSTEM.Behavior, Animal: The observable response an animal makes to any situation.Green Fluorescent Proteins: Protein analogs and derivatives of the Aequorea victoria green fluorescent protein that emit light (FLUORESCENCE) when excited with ULTRAVIOLET RAYS. They are used in REPORTER GENES in doing GENETIC TECHNIQUES. Numerous mutants have been made to emit other colors or be sensitive to pH.Prosencephalon: The anterior of the three primitive cerebral vesicles of the embryonic brain arising from the NEURAL TUBE. It subdivides to form DIENCEPHALON and TELENCEPHALON. (Stedmans Medical Dictionary, 27th ed)Serotonin: A biochemical messenger and regulator, synthesized from the essential amino acid L-TRYPTOPHAN. In humans it is found primarily in the central nervous system, gastrointestinal tract, and blood platelets. Serotonin mediates several important physiological functions including neurotransmission, gastrointestinal motility, hemostasis, and cardiovascular integrity. Multiple receptor families (RECEPTORS, SEROTONIN) explain the broad physiological actions and distribution of this biochemical mediator.Choline O-Acetyltransferase: An enzyme that catalyzes the formation of acetylcholine from acetyl-CoA and choline. EC 2.3.1.6.Neocortex: The largest portion of the CEREBRAL CORTEX in which the NEURONS are arranged in six layers in the mammalian brain: molecular, external granular, external pyramidal, internal granular, internal pyramidal and multiform layers.Superior Cervical Ganglion: The largest and uppermost of the paravertebral sympathetic ganglia.Receptors, N-Methyl-D-Aspartate: A class of ionotropic glutamate receptors characterized by affinity for N-methyl-D-aspartate. NMDA receptors have an allosteric binding site for glycine which must be occupied for the channel to open efficiently and a site within the channel itself to which magnesium ions bind in a voltage-dependent manner. The positive voltage dependence of channel conductance and the high permeability of the conducting channel to calcium ions (as well as to monovalent cations) are important in excitotoxicity and neuronal plasticity.GABA Antagonists: Drugs that bind to but do not activate GABA RECEPTORS, thereby blocking the actions of endogenous GAMMA-AMINOBUTYRIC ACID and GABA RECEPTOR AGONISTS.Aplysia: An opisthobranch mollusk of the order Anaspidea. It is used frequently in studies of nervous system development because of its large identifiable neurons. Aplysiatoxin and its derivatives are not biosynthesized by Aplysia, but acquired by ingestion of Lyngbya (seaweed) species.Macaca mulatta: A species of the genus MACACA inhabiting India, China, and other parts of Asia. The species is used extensively in biomedical research and adapts very well to living with humans.Corpus Striatum: Striped GRAY MATTER and WHITE MATTER consisting of the NEOSTRIATUM and paleostriatum (GLOBUS PALLIDUS). It is located in front of and lateral to the THALAMUS in each cerebral hemisphere. The gray substance is made up of the CAUDATE NUCLEUS and the lentiform nucleus (the latter consisting of the GLOBUS PALLIDUS and PUTAMEN). The WHITE MATTER is the INTERNAL CAPSULE.Excitatory Amino Acid Antagonists: Drugs that bind to but do not activate excitatory amino acid receptors, thereby blocking the actions of agonists.Nodose Ganglion: The inferior (caudal) ganglion of the vagus (10th cranial) nerve. The unipolar nodose ganglion cells are sensory cells with central projections to the medulla and peripheral processes traveling in various branches of the vagus nerve.Mice, Knockout: Strains of mice in which certain GENES of their GENOMES have been disrupted, or "knocked-out". To produce knockouts, using RECOMBINANT DNA technology, the normal DNA sequence of the gene being studied is altered to prevent synthesis of a normal gene product. Cloned cells in which this DNA alteration is successful are then injected into mouse EMBRYOS to produce chimeric mice. The chimeric mice are then bred to yield a strain in which all the cells of the mouse contain the disrupted gene. Knockout mice are used as EXPERIMENTAL ANIMAL MODELS for diseases (DISEASE MODELS, ANIMAL) and to clarify the functions of the genes.N-Methylaspartate: An amino acid that, as the D-isomer, is the defining agonist for the NMDA receptor subtype of glutamate receptors (RECEPTORS, NMDA).Rats, Sprague-Dawley: A strain of albino rat used widely for experimental purposes because of its calmness and ease of handling. It was developed by the Sprague-Dawley Animal Company.Reaction Time: The time from the onset of a stimulus until a response is observed.Vestibular Nuclei: The four cellular masses in the floor of the fourth ventricle giving rise to a widely dispersed special sensory system. Included is the superior, medial, inferior, and LATERAL VESTIBULAR NUCLEUS. (From Dorland, 27th ed)Stilbamidines: STILBENES with AMIDINES attached.Microelectrodes: Electrodes with an extremely small tip, used in a voltage clamp or other apparatus to stimulate or record bioelectric potentials of single cells intracellularly or extracellularly. (Dorland, 28th ed)Presynaptic Terminals: The distal terminations of axons which are specialized for the release of neurotransmitters. Also included are varicosities along the course of axons which have similar specializations and also release transmitters. Presynaptic terminals in both the central and peripheral nervous systems are included.Visual Cortex: Area of the OCCIPITAL LOBE concerned with the processing of visual information relayed via VISUAL PATHWAYS.Neurotransmitter Agents: Substances used for their pharmacological actions on any aspect of neurotransmitter systems. Neurotransmitter agents include agonists, antagonists, degradation inhibitors, uptake inhibitors, depleters, precursors, and modulators of receptor function.Raphe Nuclei: Collections of small neurons centrally scattered among many fibers from the level of the TROCHLEAR NUCLEUS in the midbrain to the hypoglossal area in the MEDULLA OBLONGATA.Posterior Horn Cells: Neurons in the SPINAL CORD DORSAL HORN whose cell bodies and processes are confined entirely to the CENTRAL NERVOUS SYSTEM. They receive collateral or direct terminations of dorsal root fibers. They send their axons either directly to ANTERIOR HORN CELLS or to the WHITE MATTER ascending and descending longitudinal fibers.Retinal Neurons: Nerve cells of the RETINA in the pathway of transmitting light signals to the CENTRAL NERVOUS SYSTEM. They include the outer layer of PHOTORECEPTOR CELLS, the intermediate layer of RETINAL BIPOLAR CELLS and AMACRINE CELLS, and the internal layer of RETINAL GANGLION CELLS.Signal Transduction: The intracellular transfer of information (biological activation/inhibition) through a signal pathway. In each signal transduction system, an activation/inhibition signal from a biologically active molecule (hormone, neurotransmitter) is mediated via the coupling of a receptor/enzyme to a second messenger system or to an ion channel. Signal transduction plays an important role in activating cellular functions, cell differentiation, and cell proliferation. Examples of signal transduction systems are the GAMMA-AMINOBUTYRIC ACID-postsynaptic receptor-calcium ion channel system, the receptor-mediated T-cell activation pathway, and the receptor-mediated activation of phospholipases. Those coupled to membrane depolarization or intracellular release of calcium include the receptor-mediated activation of cytotoxic functions in granulocytes and the synaptic potentiation of protein kinase activation. Some signal transduction pathways may be part of larger signal transduction pathways; for example, protein kinase activation is part of the platelet activation signal pathway.Photic Stimulation: Investigative technique commonly used during ELECTROENCEPHALOGRAPHY in which a series of bright light flashes or visual patterns are used to elicit brain activity.Astrocytes: A class of large neuroglial (macroglial) cells in the central nervous system - the largest and most numerous neuroglial cells in the brain and spinal cord. Astrocytes (from "star" cells) are irregularly shaped with many long processes, including those with "end feet" which form the glial (limiting) membrane and directly and indirectly contribute to the BLOOD-BRAIN BARRIER. They regulate the extracellular ionic and chemical environment, and "reactive astrocytes" (along with MICROGLIA) respond to injury.Locus Coeruleus: Bluish-colored region in the superior angle of the FOURTH VENTRICLE floor, corresponding to melanin-like pigmented nerve cells which lie lateral to the PERIAQUEDUCTAL GRAY.Pons: The front part of the hindbrain (RHOMBENCEPHALON) that lies between the MEDULLA and the midbrain (MESENCEPHALON) ventral to the cerebellum. It is composed of two parts, the dorsal and the ventral. The pons serves as a relay station for neural pathways between the CEREBELLUM to the CEREBRUM.Bicuculline: An isoquinoline alkaloid obtained from Dicentra cucullaria and other plants. It is a competitive antagonist for GABA-A receptors.Central Nervous System: The main information-processing organs of the nervous system, consisting of the brain, spinal cord, and meninges.Survival of Motor Neuron 1 Protein: A SMN complex protein that is essential for the function of the SMN protein complex. In humans the protein is encoded by a single gene found near the inversion telomere of a large inverted region of CHROMOSOME 5. Mutations in the gene coding for survival of motor neuron 1 protein may result in SPINAL MUSCULAR ATROPHIES OF CHILDHOOD.Myenteric Plexus: One of two ganglionated neural networks which together form the ENTERIC NERVOUS SYSTEM. The myenteric (Auerbach's) plexus is located between the longitudinal and circular muscle layers of the gut. Its neurons project to the circular muscle, to other myenteric ganglia, to submucosal ganglia, or directly to the epithelium, and play an important role in regulating and patterning gut motility. (From FASEB J 1989;3:127-38)Trigeminal Ganglion: The semilunar-shaped ganglion containing the cells of origin of most of the sensory fibers of the trigeminal nerve. It is situated within the dural cleft on the cerebral surface of the petrous portion of the temporal bone and gives off the ophthalmic, maxillary, and part of the mandibular nerves.Cell Differentiation: Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs.Glutamate Decarboxylase: A pyridoxal-phosphate protein that catalyzes the alpha-decarboxylation of L-glutamic acid to form gamma-aminobutyric acid and carbon dioxide. The enzyme is found in bacteria and in invertebrate and vertebrate nervous systems. It is the rate-limiting enzyme in determining GAMMA-AMINOBUTYRIC ACID levels in normal nervous tissues. The brain enzyme also acts on L-cysteate, L-cysteine sulfinate, and L-aspartate. EC 4.1.1.15.Ganglia, Parasympathetic: Ganglia of the parasympathetic nervous system, including the ciliary, pterygopalatine, submandibular, and otic ganglia in the cranial region and intrinsic (terminal) ganglia associated with target organs in the thorax and abdomen.Inhibitory Postsynaptic Potentials: Hyperpolarization of membrane potentials at the SYNAPTIC MEMBRANES of target neurons during NEUROTRANSMISSION. They are local changes which diminish responsiveness to excitatory signals.Gene Expression Regulation, Developmental: Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control of gene action during the developmental stages of an organism.In Situ Hybridization: A technique that localizes specific nucleic acid sequences within intact chromosomes, eukaryotic cells, or bacterial cells through the use of specific nucleic acid-labeled probes.Axonal Transport: The directed transport of ORGANELLES and molecules along nerve cell AXONS. Transport can be anterograde (from the cell body) or retrograde (toward the cell body). (Alberts et al., Molecular Biology of the Cell, 3d ed, pG3)Periodicity: The tendency of a phenomenon to recur at regular intervals; in biological systems, the recurrence of certain activities (including hormonal, cellular, neural) may be annual, seasonal, monthly, daily, or more frequently (ultradian).Reticular Formation: A region extending from the PONS & MEDULLA OBLONGATA through the MESENCEPHALON, characterized by a diversity of neurons of various sizes and shapes, arranged in different aggregations and enmeshed in a complicated fiber network.Brain-Derived Neurotrophic Factor: A member of the nerve growth factor family of trophic factors. In the brain BDNF has a trophic action on retinal, cholinergic, and dopaminergic neurons, and in the peripheral nervous system it acts on both motor and sensory neurons. (From Kendrew, The Encyclopedia of Molecular Biology, 1994)Analysis of Variance: A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.Sodium Channels: Ion channels that specifically allow the passage of SODIUM ions. A variety of specific sodium channel subtypes are involved in serving specialized functions such as neuronal signaling, CARDIAC MUSCLE contraction, and KIDNEY function.Cell Survival: The span of viability of a cell characterized by the capacity to perform certain functions such as metabolism, growth, reproduction, some form of responsiveness, and adaptability.Animals, Genetically Modified: ANIMALS whose GENOME has been altered by GENETIC ENGINEERING, or their offspring.Organ Culture Techniques: A technique for maintenance or growth of animal organs in vitro. It refers to three-dimensional cultures of undisaggregated tissue retaining some or all of the histological features of the tissue in vivo. (Freshney, Culture of Animal Cells, 3d ed, p1)Receptors, GABA-A: Cell surface proteins which bind GAMMA-AMINOBUTYRIC ACID and contain an integral membrane chloride channel. Each receptor is assembled as a pentamer from a pool of at least 19 different possible subunits. The receptors belong to a superfamily that share a common CYSTEINE loop.Cell Death: The termination of the cell's ability to carry out vital functions such as metabolism, growth, reproduction, responsiveness, and adaptability.Ventral Tegmental Area: A region in the MESENCEPHALON which is dorsomedial to the SUBSTANTIA NIGRA and ventral to the RED NUCLEUS. The mesocortical and mesolimbic dopaminergic systems originate here, including an important projection to the NUCLEUS ACCUMBENS. Overactivity of the cells in this area has been suspected to contribute to the positive symptoms of SCHIZOPHRENIA.Dose-Response Relationship, Drug: The relationship between the dose of an administered drug and the response of the organism to the drug.Electrophysiological Phenomena: The electrical properties, characteristics of living organisms, and the processes of organisms or their parts that are involved in generating and responding to electrical charges.Capsaicin: An alkylamide found in CAPSICUM that acts at TRPV CATION CHANNELS.Olfactory Bulb: Ovoid body resting on the CRIBRIFORM PLATE of the ethmoid bone where the OLFACTORY NERVE terminates. The olfactory bulb contains several types of nerve cells including the mitral cells, on whose DENDRITES the olfactory nerve synapses, forming the olfactory glomeruli. The accessory olfactory bulb, which receives the projection from the VOMERONASAL ORGAN via the vomeronasal nerve, is also included here.6-Cyano-7-nitroquinoxaline-2,3-dione: A potent excitatory amino acid antagonist with a preference for non-NMDA iontropic receptors. It is used primarily as a research tool.Receptors, AMPA: A class of ionotropic glutamate receptors characterized by their affinity for the agonist AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid).Arcuate Nucleus: A nucleus located in the middle hypothalamus in the most ventral part of the third ventricle near the entrance of the infundibular recess. Its small cells are in close contact with the ependyma.Iontophoresis: Therapeutic introduction of ions of soluble salts into tissues by means of electric current. In medical literature it is commonly used to indicate the process of increasing the penetration of drugs into surface tissues by the application of electric current. It has nothing to do with ION EXCHANGE; AIR IONIZATION nor PHONOPHORESIS, none of which requires current.Mechanoreceptors: Cells specialized to transduce mechanical stimuli and relay that information centrally in the nervous system. Mechanoreceptor cells include the INNER EAR hair cells, which mediate hearing and balance, and the various somatosensory receptors, often with non-neural accessory structures.Disease Models, Animal: Naturally occurring or experimentally induced animal diseases with pathological processes sufficiently similar to those of human diseases. They are used as study models for human diseases.RNA, Messenger: RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.Embryo, Mammalian: The entity of a developing mammal (MAMMALS), generally from the cleavage of a ZYGOTE to the end of embryonic differentiation of basic structures. For the human embryo, this represents the first two months of intrauterine development preceding the stages of the FETUS.Visual Pathways: Set of cell bodies and nerve fibers conducting impulses from the eyes to the cerebral cortex. It includes the RETINA; OPTIC NERVE; optic tract; and geniculocalcarine tract.S100 Calcium Binding Protein G: A calbindin protein found in many mammalian tissues, including the UTERUS, PLACENTA, BONE, PITUITARY GLAND, and KIDNEYS. In intestinal ENTEROCYTES it mediates intracellular calcium transport from apical to basolateral membranes via calcium binding at two EF-HAND MOTIFS. Expression is regulated in some tissues by VITAMIN D.Thalamic Nuclei: Several groups of nuclei in the thalamus that serve as the major relay centers for sensory impulses in the brain.Auditory Pathways: NEURAL PATHWAYS and connections within the CENTRAL NERVOUS SYSTEM, beginning at the hair cells of the ORGAN OF CORTI, continuing along the eighth cranial nerve, and terminating at the AUDITORY CORTEX.Leeches: Annelids of the class Hirudinea. Some species, the bloodsuckers, may become temporarily parasitic upon animals, including man. Medicinal leeches (HIRUDO MEDICINALIS) have been used therapeutically for drawing blood since ancient times.Excitatory Amino Acid Agonists: Drugs that bind to and activate excitatory amino acid receptors.Supraoptic Nucleus: Hypothalamic nucleus overlying the beginning of the OPTIC TRACT.Proto-Oncogene Proteins c-fos: Cellular DNA-binding proteins encoded by the c-fos genes (GENES, FOS). They are involved in growth-related transcriptional control. c-fos combines with c-jun (PROTO-ONCOGENE PROTEINS C-JUN) to form a c-fos/c-jun heterodimer (TRANSCRIPTION FACTOR AP-1) that binds to the TRE (TPA-responsive element) in promoters of certain genes.Neurotoxins: Toxic substances from microorganisms, plants or animals that interfere with the functions of the nervous system. Most venoms contain neurotoxic substances. Myotoxins are included in this concept.Rats, Long-Evans: An outbred strain of rats developed in 1915 by crossing several Wistar Institute white females with a wild gray male. Inbred strains have been derived from this original outbred strain, including Long-Evans cinnamon rats (RATS, INBRED LEC) and Otsuka-Long-Evans-Tokushima Fatty rats (RATS, INBRED OLETF), which are models for Wilson's disease and non-insulin dependent diabetes mellitus, respectively.Potassium Channels: Cell membrane glycoproteins that are selectively permeable to potassium ions. At least eight major groups of K channels exist and they are made up of dozens of different subunits.Parvalbumins: Low molecular weight, calcium binding muscle proteins. Their physiological function is possibly related to the contractile process.Paraventricular Hypothalamic Nucleus: Nucleus in the anterior part of the HYPOTHALAMUS.Electric Conductivity: The ability of a substrate to allow the passage of ELECTRONS.Acoustic Stimulation: Use of sound to elicit a response in the nervous system.Sodium Channel Blockers: A class of drugs that act by inhibition of sodium influx through cell membranes. Blockade of sodium channels slows the rate and amplitude of initial rapid depolarization, reduces cell excitability, and reduces conduction velocity.Vesicular Glutamate Transport Protein 2: A vesicular glutamate transporter protein that is predominately expressed in the DIENCEPHALON and lower brainstem regions of the CENTRAL NERVOUS SYSTEM.Axotomy: Transection or severing of an axon. This type of denervation is used often in experimental studies on neuronal physiology and neuronal death or survival, toward an understanding of nervous system disease.Substance P: An eleven-amino acid neurotransmitter that appears in both the central and peripheral nervous systems. It is involved in transmission of PAIN, causes rapid contractions of the gastrointestinal smooth muscle, and modulates inflammatory and immune responses.Hypothalamic Area, Lateral: Area in the hypothalamus bounded medially by the mammillothalamic tract and the anterior column of the FORNIX (BRAIN). The medial edge of the INTERNAL CAPSULE and the subthalamic region form its lateral boundary. It contains the lateral hypothalamic nucleus, tuberomammillary nucleus, lateral tuberal nuclei, and fibers of the MEDIAL FOREBRAIN BUNDLE.Calbindins: Calcium-binding proteins that are found in DISTAL KIDNEY TUBULES, INTESTINES, BRAIN, and other tissues where they bind, buffer and transport cytoplasmic calcium. Calbindins possess a variable number of EF-HAND MOTIFS which contain calcium-binding sites. Some isoforms are regulated by VITAMIN D.Neuroprotective Agents: Drugs intended to prevent damage to the brain or spinal cord from ischemia, stroke, convulsions, or trauma. Some must be administered before the event, but others may be effective for some time after. They act by a variety of mechanisms, but often directly or indirectly minimize the damage produced by endogenous excitatory amino acids.Calbindin 2: A calbindin protein that is differentially expressed in distinct populations of NEURONS throughout the vertebrate and invertebrate NERVOUS SYSTEM, and modulates intrinsic neuronal excitability and influences LONG-TERM POTENTIATION. It is also found in LUNG, TESTIS, OVARY, KIDNEY, and BREAST, and is expressed in many tumor types found in these tissues. It is often used as an immunohistochemical marker for MESOTHELIOMA.Neural Conduction: The propagation of the NERVE IMPULSE along the nerve away from the site of an excitation stimulus.Somatosensory Cortex: Area of the parietal lobe concerned with receiving sensations such as movement, pain, pressure, position, temperature, touch, and vibration. It lies posterior to the central sulcus.Dendritic Spines: Spiny processes on DENDRITES, each of which receives excitatory input from one nerve ending (NERVE ENDINGS). They are commonly found on PURKINJE CELLS and PYRAMIDAL CELLS.Calcium Channels: Voltage-dependent cell membrane glycoproteins selectively permeable to calcium ions. They are categorized as L-, T-, N-, P-, Q-, and R-types based on the activation and inactivation kinetics, ion specificity, and sensitivity to drugs and toxins. The L- and T-types are present throughout the cardiovascular and central nervous systems and the N-, P-, Q-, & R-types are located in neuronal tissue.Vagus Nerve: The 10th cranial nerve. The vagus is a mixed nerve which contains somatic afferents (from skin in back of the ear and the external auditory meatus), visceral afferents (from the pharynx, larynx, thorax, and abdomen), parasympathetic efferents (to the thorax and abdomen), and efferents to striated muscle (of the larynx and pharynx).Respiratory Center: Part of the brain located in the MEDULLA OBLONGATA and PONS. It receives neural, chemical and hormonal signals, and controls the rate and depth of respiratory movements of the DIAPHRAGM and other respiratory muscles.Macaca fascicularis: A species of the genus MACACA which typically lives near the coast in tidal creeks and mangrove swamps primarily on the islands of the Malay peninsula.Chick Embryo: The developmental entity of a fertilized chicken egg (ZYGOTE). The developmental process begins about 24 h before the egg is laid at the BLASTODISC, a small whitish spot on the surface of the EGG YOLK. After 21 days of incubation, the embryo is fully developed before hatching.Ganglia, Sensory: Clusters of neurons in the somatic peripheral nervous system which contain the cell bodies of sensory nerve axons. Sensory ganglia may also have intrinsic interneurons and non-neuronal supporting cells.Enteric Nervous System: Two ganglionated neural plexuses in the gut wall which form one of the three major divisions of the autonomic nervous system. The enteric nervous system innervates the gastrointestinal tract, the pancreas, and the gallbladder. It contains sensory neurons, interneurons, and motor neurons. Thus the circuitry can autonomously sense the tension and the chemical environment in the gut and regulate blood vessel tone, motility, secretions, and fluid transport. The system is itself governed by the central nervous system and receives both parasympathetic and sympathetic innervation. (From Kandel, Schwartz, and Jessel, Principles of Neural Science, 3d ed, p766)Cholinergic Fibers: Nerve fibers liberating acetylcholine at the synapse after an impulse.Macaca: A genus of the subfamily CERCOPITHECINAE, family CERCOPITHECIDAE, consisting of 16 species inhabiting forests of Africa, Asia, and the islands of Borneo, Philippines, and Celebes.Kainic Acid: (2S-(2 alpha,3 beta,4 beta))-2-Carboxy-4-(1-methylethenyl)-3-pyrrolidineacetic acid. Ascaricide obtained from the red alga Digenea simplex. It is a potent excitatory amino acid agonist at some types of excitatory amino acid receptors and has been used to discriminate among receptor types. Like many excitatory amino acid agonists it can cause neurotoxicity and has been used experimentally for that purpose.Inferior Colliculi: The posterior pair of the quadrigeminal bodies which contain centers for auditory function.Gene Expression Regulation: Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control (induction or repression) of gene action at the level of transcription or translation.Nervous System: The entire nerve apparatus, composed of a central part, the brain and spinal cord, and a peripheral part, the cranial and spinal nerves, autonomic ganglia, and plexuses. (Stedman, 26th ed)Purkinje Cells: The output neurons of the cerebellar cortex.Biological Clocks: The physiological mechanisms that govern the rhythmic occurrence of certain biochemical, physiological, and behavioral phenomena.Receptors, Glutamate: Cell-surface proteins that bind glutamate and trigger changes which influence the behavior of cells. Glutamate receptors include ionotropic receptors (AMPA, kainate, and N-methyl-D-aspartate receptors), which directly control ion channels, and metabotropic receptors which act through second messenger systems. Glutamate receptors are the most common mediators of fast excitatory synaptic transmission in the central nervous system. They have also been implicated in the mechanisms of memory and of many diseases.Nerve Regeneration: Renewal or physiological repair of damaged nerve tissue.Neurofilament Proteins: Type III intermediate filament proteins that assemble into neurofilaments, the major cytoskeletal element in nerve axons and dendrites. They consist of three distinct polypeptides, the neurofilament triplet. Types I, II, and IV intermediate filament proteins form other cytoskeletal elements such as keratins and lamins. It appears that the metabolism of neurofilaments is disturbed in Alzheimer's disease, as indicated by the presence of neurofilament epitopes in the neurofibrillary tangles, as well as by the severe reduction of the expression of the gene for the light neurofilament subunit of the neurofilament triplet in brains of Alzheimer's patients. (Can J Neurol Sci 1990 Aug;17(3):302)Microscopy, Confocal: A light microscopic technique in which only a small spot is illuminated and observed at a time. An image is constructed through point-by-point scanning of the field in this manner. Light sources may be conventional or laser, and fluorescence or transmitted observations are possible.Neuropeptide Y: A 36-amino acid peptide present in many organs and in many sympathetic noradrenergic neurons. It has vasoconstrictor and natriuretic activity and regulates local blood flow, glandular secretion, and smooth muscle activity. The peptide also stimulates feeding and drinking behavior and influences secretion of pituitary hormones.Superior Colliculi: The anterior pair of the quadrigeminal bodies which coordinate the general behavioral orienting responses to visual stimuli, such as whole-body turning, and reaching.Synaptic Potentials: The voltages across pre- or post-SYNAPTIC MEMBRANES.Olivary Nucleus: A part of the MEDULLA OBLONGATA situated in the olivary body. It is involved with motor control and is a major source of sensory input to the CEREBELLUM.Mirror Neurons: Neurons that fire when an animal acts or observes the same action of another thus coding the motor response. They were originally discovered in the premotor and parietal cortex of the monkey and studies have shown that neurons that have a similar mechanism are present in humans. Mirror neurons are theorized to be related to social cognition.Odors: The volatile portions of substances perceptible by the sense of smell. (Grant & Hackh's Chemical Dictionary, 5th ed)Preoptic Area: Region of hypothalamus between the ANTERIOR COMMISSURE and OPTIC CHIASM.Nerve Growth Factor: NERVE GROWTH FACTOR is the first of a series of neurotrophic factors that were found to influence the growth and differentiation of sympathetic and sensory neurons. It is comprised of alpha, beta, and gamma subunits. The beta subunit is responsible for its growth stimulating activity.Neostriatum: The phylogenetically newer part of the CORPUS STRIATUM consisting of the CAUDATE NUCLEUS and PUTAMEN. It is often called simply the striatum.Nerve Fibers: Slender processes of NEURONS, including the AXONS and their glial envelopes (MYELIN SHEATH). Nerve fibers conduct nerve impulses to and from the CENTRAL NERVOUS SYSTEM.Fluorescent Dyes: Agents that emit light after excitation by light. The wave length of the emitted light is usually longer than that of the incident light. Fluorochromes are substances that cause fluorescence in other substances, i.e., dyes used to mark or label other compounds with fluorescent tags.Ion Channels: Gated, ion-selective glycoproteins that traverse membranes. The stimulus for ION CHANNEL GATING can be due to a variety of stimuli such as LIGANDS, a TRANSMEMBRANE POTENTIAL DIFFERENCE, mechanical deformation or through INTRACELLULAR SIGNALING PEPTIDES AND PROTEINS.Smell: The ability to detect scents or odors, such as the function of OLFACTORY RECEPTOR NEURONS.Brain Mapping: Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures.Calcium Signaling: Signal transduction mechanisms whereby calcium mobilization (from outside the cell or from intracellular storage pools) to the cytoplasm is triggered by external stimuli. Calcium signals are often seen to propagate as waves, oscillations, spikes, sparks, or puffs. The calcium acts as an intracellular messenger by activating calcium-responsive proteins.Trigeminal Nerve: The 5th and largest cranial nerve. The trigeminal nerve is a mixed motor and sensory nerve. The larger sensory part forms the ophthalmic, mandibular, and maxillary nerves which carry afferents sensitive to external or internal stimuli from the skin, muscles, and joints of the face and mouth and from the teeth. Most of these fibers originate from cells of the TRIGEMINAL GANGLION and project to the TRIGEMINAL NUCLEUS of the brain stem. The smaller motor part arises from the brain stem trigeminal motor nucleus and innervates the muscles of mastication.GABA Agonists: Endogenous compounds and drugs that bind to and activate GAMMA-AMINOBUTYRIC ACID receptors (RECEPTORS, GABA).Grasshoppers: Plant-eating orthopterans having hindlegs adapted for jumping. There are two main families: Acrididae and Romaleidae. Some of the more common genera are: Melanoplus, the most common grasshopper; Conocephalus, the eastern meadow grasshopper; and Pterophylla, the true katydid.Mutation: Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.Trigeminal Nuclei: Nuclei of the trigeminal nerve situated in the brain stem. They include the nucleus of the spinal trigeminal tract (TRIGEMINAL NUCLEUS, SPINAL), the principal sensory nucleus, the mesencephalic nucleus, and the motor nucleus.
Regulation of neurotrophin-3 expression by epithelial-mesenchymal interactions: the role of Wnt factors. (1/5514)
Neurotrophins regulate survival, axonal growth, and target innervation of sensory and other neurons. Neurotrophin-3 (NT-3) is expressed specifically in cells adjacent to extending axons of dorsal root ganglia neurons, and its absence results in loss of most of these neurons before their axons reach their targets. However, axons are not required for NT-3 expression in limbs; instead, local signals from ectoderm induce NT-3 expression in adjacent mesenchyme. Wnt factors expressed in limb ectoderm induce NT-3 in the underlying mesenchyme. Thus, epithelial-mesenchymal interactions mediated by Wnt factors control NT-3 expression and may regulate axonal growth and guidance. (+info)Plasticity of first-order sensory synapses: interactions between homosynaptic long-term potentiation and heterosynaptically evoked dopaminergic potentiation. (2/5514)
Persistent potentiations of the chemical and electrotonic components of the eighth nerve (NVIII) EPSP recorded in vivo in the goldfish reticulospinal neuron, the Mauthner cell, can be evoked by afferent tetanization or local dendritic application of an endogenous transmitter, dopamine (3-hydroxytyramine). These modifications are attributable to the activation of distinct intracellular kinase cascades. Although dopamine-evoked potentiation (DEP) is mediated by the cAMP-dependent protein kinase (PKA), tetanization most likely activates a Ca2+-dependent protein kinase via an increased intracellular Ca2+ concentration. We present evidence that the eighth nerve tetanus that induces LTP does not act by triggering dopamine release, because it is evoked in the presence of a broad spectrum of dopamine antagonists. To test for interactions between these pathways, we applied the potentiating paradigms sequentially. When dopamine was applied first, tetanization produced additional potentiation of the mixed synaptic response, but when the sequence was reversed, DEP was occluded, indicating that the synapses potentiated by the two procedures belong to the same or overlapping populations. Experiments were conducted to determine interactions between the underlying regulatory mechanisms and the level of their convergence. Inhibiting PKA does not impede tetanus-induced LTP, and chelating postsynaptic Ca2+ with BAPTA does not block DEP, indicating that the initial steps of the induction processes are independent. Pharmacological and voltage-clamp analyses indicate that the two pathways converge on functional AMPA/kainate receptors for the chemically mediated EPSP and gap junctions for the electrotonic component or at intermediaries common to both pathways. A cellular model incorporating these interactions is proposed on the basis of differential modulation of synaptic responses via receptor-protein phosphorylation. (+info)Neural mapping of direction and frequency in the cricket cercal sensory system. (3/5514)
Primary mechanosensory receptors and interneurons in the cricket cercal sensory system are sensitive to the direction and frequency of air current stimuli. Receptors innervating long mechanoreceptor hairs (>1000 microm) are most sensitive to low-frequency air currents (<150 Hz); receptors innervating medium-length hairs (900-500 microm) are most sensitive to higher frequency ranges (150-400 Hz). Previous studies demonstrated that the projection pattern of the synaptic arborizations of long hair receptor afferents form a continuous map of air current direction within the terminal abdominal ganglion (). We demonstrate here that the projection pattern of the medium-length hair afferents also forms a continuous map of stimulus direction. However, the afferents from the long and medium-length hair afferents show very little spatial segregation with respect to their frequency sensitivity. The possible functional significance of this small degree of spatial segregation was investigated, by calculating the relative overlap between the long and medium-length hair afferents with the dendrites of two interneurons that are known to have different frequency sensitivities. Both interneurons were shown to have nearly equal anatomical overlap with long and medium hair afferents. Thus, the differential overlap of these interneurons with the two different classes of afferents was not adequate to explain the observed frequency selectivity of the interneurons. Other mechanisms such as selective connectivity between subsets of afferents and interneurons and/or differences in interneuron biophysical properties must play a role in establishing the frequency selectivities of these interneurons. (+info)Differential expression of the mRNA for the vanilloid receptor subtype 1 in cells of the adult rat dorsal root and nodose ganglia and its downregulation by axotomy. (4/5514)
Sensitivity to the pungent vanilloid, capsaicin, defines a subpopulation of primary sensory neurons that are mainly polymodal nociceptors. The recently cloned vanilloid receptor subtype 1 (VR1) is activated by capsaicin and noxious heat. Using combined in situ hybridization and histochemical methods, we have characterized in sensory ganglia the expression of VR1 mRNA. We show that this receptor is almost exclusively expressed by neurofilament-negative small- and medium-sized dorsal root ganglion cells. Within this population, VR1 mRNA is detected at widely varying levels in both the NGF receptor (trkA)-positive, peptide-producing cells that elicit neurogenic inflammation and the functionally less characterized glial cell line-derived neurotrophic factor-responsive cells that bind lectin Griffonia simplicifolia isolectin B4 (IB4). Cells without detectable levels of VR1 mRNA are found in both classes. A subpopulation of the IB4-binding cells that produce somatostatin has relatively low levels of VR1 mRNA. A previously uncharacterized population of very small cells that express the receptor tyrosine kinase (RET) and that do not label for trkA or IB4-binding has the highest relative levels of VR1 mRNA. The majority of small visceral sensory neurons of the nodose ganglion also express VR1 mRNA, in conjunction with the BDNF receptor trkB but not trkA. Axotomy results in the downregulation of VR1 mRNA in dorsal root ganglion cells. Our data emphasize the heterogeneity of VR1 mRNA expression by subclasses of small sensory neurons, and this may result in their differential sensitivity to chemical and noxious heat stimuli. Our results also indicate that peripherally derived trophic factors may regulate levels of VR1 mRNA. (+info)Localization of sympathetic, parasympathetic and sensory neurons innervating the heart of the Beijing duck by means of the retrograde transport of horseradish peroxidase. (5/5514)
Sympathetic, parasympathetic and sensory neurons were labeled by injections of horseradish peroxidase into various regions of the heart in 33 Beijing ducks. Sympathetic postganglionic neurons innervating the heart were located in the paravertebral ganglia C15 (C16 is the last cervical segment in the duck) to T3, especially in the ganglion T1. The coronary sulcus and ventricle were more abundantly innervated by sympathetic neurons than the atrium. The left side of the heart was preferentially innervated by sympathetic postganglionic neurons in the left side of paravertebral ganglia but the right side of the heart were equally supplied from the right and left ganglia. Within the medulla oblongata, the number of labeled vagal preganglionic neurons in the nucleus ambiguus was much greater than that in the dorsal motor nucleus of the vagus nerve. Labeled neurons of the nucleus ambiguus were found in many ducks injected into the coronary sulcus. Cardiac sensory neurons were observed in the dorsal root ganglia C15 to T2 (highest in the ganglion T1) and in the nodose and jugular ganglia of the vagus nerve. These labeled neurons probably form the afferent and efferent limbs of cardiac reflexes and control circulation in the Beijing duck. (+info)The posterior nasal nerve plays an important role on cardiopulmonary reflexes to nasal application of capsaicin, distilled water and l-menthol in anesthetized dogs. (6/5514)
The sensory innervation of the cardiopulmonary reflexes to nasal application of capsaicin (CAPS), distilled water (DW) and l-menthol (LM) was studied in anesthetized dogs breathing through tracheostomy. A marked cardiopulmonary reflex was observed by CAPS and DW into the nasal cavity, while a prolongation of expiration was induced by LM. All these reflexes were significantly decreased by bilateral section of the posterior nasal nerve (PNN) and completely abolished by topical nasal anesthesia with lidocaine. Responses of the whole nerve activity of the PNN to these substances corresponded to the magnitude of the reflexes. These results indicate that PNN afferents play an important role on the reflex elicitation of the noxious, water and cold stimuli from the nasal cavity. (+info)Mechanisms for generating the autonomous cAMP-dependent protein kinase required for long-term facilitation in Aplysia. (7/5514)
The formation of a persistently active cAMP-dependent protein kinase (PKA) is critical for establishing long-term synaptic facilitation (LTF) in Aplysia. The injection of bovine catalytic (C) subunits into sensory neurons is sufficient to produce protein synthesis-dependent LTF. Early in the LTF induced by serotonin (5-HT), an autonomous PKA is generated through the ubiquitin-proteasome-mediated proteolysis of regulatory (R) subunits. The degradation of R occurs during an early time window and appears to be a key function of proteasomes in LTF. Lactacystin, a specific proteasome inhibitor, blocks the facilitation induced by 5-HT, and this block is rescued by injecting C subunits. R is degraded through an allosteric mechanism requiring an elevation of cAMP coincident with the induction of a ubiquitin carboxy-terminal hydrolase. (+info)Electrophysiological evidence for tetrodotoxin-resistant sodium channels in slowly conducting dural sensory fibers. (8/5514)
A tetrodotoxin (TTX)-resistant sodium channel was recently identified that is expressed only in small diameter neurons of peripheral sensory ganglia. The peripheral axons of sensory neurons appear to lack this channel, but its presence has not been investigated in peripheral nerve endings, the site of sensory transduction in vivo. We investigated the effect of TTX on mechanoresponsiveness in nerve endings of sensory neurons that innervate the intracranial dura. Because the degree of TTX resistance of axonal branches could potentially be affected by factors other than channel subtype, the neurons were also tested for sensitivity to lidocaine, which blocks both TTX-sensitive and TTX-resistant sodium channels. Single-unit activity was recorded from dural afferent neurons in the trigeminal ganglion of urethan-anesthetized rats. Response thresholds to mechanical stimulation of the dura were determined with von Frey monofilaments while exposing the dura to progressively increasing concentrations of TTX or lidocaine. Neurons with slowly conducting axons were relatively resistant to TTX. Application of 1 microM TTX produced complete suppression of mechanoresponsiveness in all (11/11) fast A-delta units [conduction velocity (c.v.) 5-18 m/s] but only 50% (5/10) of slow A-delta units (1.5
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Sensory nervous systemThese impulses are transmitted to the brain through afferent neurons. Senses and receptors[edit]. While debate exists among ... "Neuron. 67 (1): 49-60. doi:10.1016/j.neuron.2010.05.023. PMC 2904318. PMID 20624591.. CS1 maint: Uses authors parameter (link) ... This action potential then travels along afferent neurons to specific brain regions where it is processed and interpreted.[5] ... Olfactory nerve: 1° neuron. *Olfactory receptor neurons (Olfactory receptor) → Olfactory bulb (Glomeruli) ...
These impulses are transmitted to the brain through afferent neurons.. Senses and receptors[edit]. While debate exists among ... This action potential then travels along afferent neurons to specific brain regions where it is processed and interpreted.[5] ... Olfactory nerve: 1° neuron. *Olfactory receptor neurons (Olfactory receptor) → Olfactory bulb (Glomeruli) ... which is carried along one or more afferent neurons towards a specific area of the brain. While the term sensory cortex is ...
The pupillary light reflex neural pathway on the each side has an afferent limb and two efferent limbs. The afferent limb has ... Types of neurons[edit]. The optic nerve, or more precisely, the photosensitive ganglion cells through the retinohypothalamic ... The afferent limb carries sensory input. Anatomically, the afferent limb consists of the retina, the optic nerve, and the ... Afferent signals from the left eye cannot pass through the transected left optic nerve to reach the intact efferent limb on the ...
"Deletion of leptin signaling in vagal afferent neurons results in hyperphagia and obesity". Molecular Metabolism. 3 (6): 595- ...
Often tumor cells secrete growth factors which activate receptors close to primary afferent neurons. Activation of these neural ... For many years it has been known that bones are innervated with sensory neurons. Yet their exact anatomy remained obscure due ... Bone tissue is innervated by both myelinated (A beta and A delta fiber) and unmyelinated (C fiber) sensory neurons. In ... Mouse and other animal models are being heavily used to determine the neuron tissue densities in bone and mechanisms for ...
Willis, William D.; Coggeshall, Richard E. (31 January 2004). Sensory Mechanisms of the Spinal Cord: Primary afferent neurons ... "Neuron. 65 (2): 150-164. doi:10.1016/j.neuron.2009.12.009. PMC 3717333. PMID 20152123.. ... doi:10.1016/j.neuron.2006.11.012. PMID 17178409.. *^ Stone, James V. (2012): "Vision and Brain: How we perceive the world", ... Some processing of texture and movement occurs within the neurons on the retina before the information is sent to the brain. In ...
The Ia afferent signals are transmitted monosynaptically to many alpha motor neurons of the receptor-bearing muscle. The ... The motor part of the spindle is provided by motor neurons: up to a dozen gamma motor neurons and one or two beta motor neurons ... Gamma motor neurons supply only muscle fibres within the spindle, whereas beta motor neurons supply muscle fibres both within ... The sensory endings of a primary (group Ia) afferent and a secondary (group II) afferent coil around the non-contractile ...
These afferent neurons project up the spinal cord to the parabrachial area, which innervates several areas of the preoptic area ... Endogenous angiotensin II facilitates GABAergicneurotransmission afferent to the Na+-responsive neurons of the rat median ... a b Luppi, P. H., & Fort, P. (2011). What are the mechanisms activating the sleep-active neurons located in the preoptic area? ... The promotion of sleep by GABAergic neurons in the median preoptic area is most closely associated with NREM, or quiet sleep.[ ...
Rizzolatti, G., Scandolara, C., Matelli, M. and Gentilucci, J (1981). "Afferent properties of periarcuate neurons in macaque ... Neurons here are responsive to tactile stimuli, visual stimuli, and auditory stimuli.[15][16][17][18] These neurons are ... Mirror neurons were first discovered in area F5 in the monkey brain by Rizzolatti and colleagues.[24][25] These neurons are ... Yet the same neurons become active when the monkey watches an experimenter grasp an object in the same way. The neurons are ...
Rizzolatti, G; Scandolara, C; Matelli, M; Gentilucci, M. (1981). "Afferent properties of periarcuate neurons in macaque monkeys ... Each multisensory neuron responded to a touch within a specific "tactile receptive field" on the body surface. Each neuron also ... Some neurons responded to sound sources near the tactile receptive field. Some neurons also responded mnemonically, becoming ... Neuron. 43 (4): 585-593. doi:10.1016/j.neuron.2004.07.029. PMID 15312656. Cooke, DF; Graziano, MSA (2004). "Sensorimotor ...
This action potential then travels along afferent neurons to specific brain regions where it is processed and interpreted.[5] ... "Neuron. 67 (1): 49-60. doi:10.1016/j.neuron.2010.05.023. PMC 2904318. PMID 20624591.. CS1 maint: uses authors parameter (link) ... which is carried along one or more afferent neurons towards a specific area of the brain. While the term sensory cortex is ... A sensory system consists of sensory neurons (including the sensory receptor cells), neural pathways, and parts of the brain ...
"Afferent properties of periarcuate neurons in macaque monkeys, II. Visual responses". Beh. Brain Res. 2 (2): 147-163. doi: ... a neuron in motor cortex sends an axon or projection to the spinal cord and forms a synapse on a motor neuron. The motor neuron ... Yet the same neurons become active when the monkey watches an experimenter grasp an object in the same way. The neurons are ... Mirror neurons were first discovered in area F5 in the monkey brain by Rizzolatti and colleagues. These neurons are active when ...
... s are at the ends of afferent neurons. They are usually encapsulated in elaborate cellular corpuscles. ... In sensory transduction, the afferent nerves transmit through a series of synapses in the central nervous system, first in the ...
... pathways arise from subpopulations of primary afferent nociceptor". Neuron. 47: 787-93. doi:10.1016/j.neuron.2005.08.015. PMID ... "VGLUT2 expression in primary afferent neurons is essential for normal acute pain and injury-induced heat hypersensitivity". ... Cao, Y.Q.; Mantyh, P.W.; Carlson, E.J.; Gillespie, A.-M.; Epstein, C.J.; Basbaum, A.I. (1998). "Primary afferent tachykinins ... Liu, H.; Mantyh, P.W.; Basbaum, A.I. (1997). "NMDA-receptor regulation of substance P release from primary afferent nociceptors ...
These impulses are transmitted to the brain through afferent neurons. While debate exists among neurologists as to the specific ... This action potential then travels along afferent neurons to specific brain regions where it is processed and interpreted. ... which is carried along one or more afferent neurons towards a specific area of the brain. While the term sensory cortex is ... A sensory system consists of sensory neurons (including the sensory receptor cells), neural pathways, and parts of the brain ...
Golgi I neurons have long axons that can move signals over long distances, such as in Purkinje cells, whereas Golgi II neurons ... A categorisation based on Golgi impregnation of spinal and cranial somatic and visceral afferent and efferent cells in the ... The shape of a neuron often directs the neuron's function by establishing its synaptic partnerships. However, there is also a ... Neuron *^ a b Peters, Alan; Palay, Sanford L.; Webster, Henry deF. (January 1991). The Fine Structure of the Nervous System: ...
... and third order neurons. The first order neuron is the afferent neuron. The first order neuron enters the spinal cord through ... sensory neurons) found within the various layer of the skin and body. The afferent neuron travels to the spinal column, then up ... In most cases, the nerve damage occurs in afferent neurons in the foot and lower limbs. Nerve damage can be assessed with ... If the neurons are coming from the lower limbs are carried by the fasciculus gracilis into the medulla. If the neurons are ...
Synaptic integration by V1 neurons depends on location within the orientation map. Neuron 36: 969-978, 2002. Newton, J.R., C. ... Disruption of retinogeniculate afferent segregation by antagonists to NMDA receptors. Nature 351: 568-570, 1991. Nelson, S., L ... Neuron 47: 267-280, 2005. Tropea, D., G. Kreiman, A. Lyckman, S. Mukherjee, H. Yu, S. Horng and M. Sur. Gene expression changes ... Neuron 32: 1181-1192, 2001. Dragoi, V., J. Sharma, E.K. Miller and M. Sur. Dynamics of neuronal sensitivity in visual cortex ...
Afferent signals enter the spinal cord at the superficial layer of the dorsal horn[disambiguation needed] Second order neurons ... Jänig, W. (1996-01-05). "Neurobiology of visceral afferent neurons: neuroanatomy, functions, organ regulations and sensations ... Afferent signals from the vagus nerve enter the spinal cord in layers IV, V, and VI of the dorsal horn[disambiguation needed] ... Afferent signals from the mechanoreceptors or proprioceptors enter the spinal cord at the dorsal root ganglia Second order ...
The main function of the IHCs is to transmit sound information via afferent neurons. They do this by transducing mechanical ... This electric current creates action potentials within the connected afferent neurons. OHCs are different in that they actually ... Whereby, neurons which would normally be stimulated by the dead region, have been reassigned to respond to functioning areas ... Thus, an increase in firing rate of the auditory neurons connected to the hair cell occurs. On the other hand, the bending of ...
The dendrites receive most of the synaptic inputs from afferent neurons that regulate the magnocellular neurons; typically a ... These cells are neuroendocrine neurons, are electrically excitable, and generate action potentials in response to afferent ... magnocellular neuron receives about 10,000 synapses from afferent neurons. Parvocellular neurosecretory cell Leng, G; Brown, CH ... Magnocellular neurosecretory cells in rats (where these neurons have been most extensively studied) in general have a single ...
"Innervation of different peptide-containing neurons in the hippocampus by GABAergic septal afferents". Neuroscience. 37 (1): 31 ... pyr.) contains the cell bodies of the Pyramidal neurons, which are the principal excitatory neurons of the hippocampus. This ... Subicular neurons send their axons mainly to the EC. The perforant path-to-dentate gyrus-to-CA3-to-CA1 was called the ... At the circuit level, the alveus contains axonal fibers from the DG and from Pyramidal neurons of CA3, CA2, CA1 and subiculum ( ...
As enteric afferent and efferent nerves do not protrude into the intestinal lumen, EC cells act as a form of sensory ... The primary effect of serotonin involves the increase in peristaltic contraction through its effects on both ENS neurons and ... Upon activation, EC cells release serotonin to act upon serotonin receptors on ENS neurons. Dependent on concentration, ... 5-HT also activates a neural secretory response, whereby binding at 5-HT1P receptors on myenteric neurons triggers a signalling ...
... afferent). The axons of dorsal root ganglion neurons are known as afferents. In the peripheral nervous system, afferents refer ... In a neuron, the dendrite receives information from another neuron's axon at the synapse, and the axon sends information to the ... Unlike the majority of neurons found in the central nervous system, an action potential in posterior root ganglion neuron may ... Note: the neuron can consist of three parts: Dendrite that receives the information and relays it to the Soma, or cell body. ...
The loss of afferent signals induces functional changes in dorsal horn neurons. A decrease in the large fiber input decreases ... the activity of interneurons inhibiting nociceptive neurons i.e. loss of afferent inhibition. Hypoactivity of the descending ... Neurons become unusually sensitive and develop spontaneously pathological activity, abnormal excitability, and heightened ... This phenomenon is called "peripheral sensitization". The (spinal cord) dorsal horn neurons give rise to the spinothalamic ...
... coexists with the excitatory neurotransmitter glutamate in primary afferents that respond to painful stimulation.[ ... Its receptor - the neurokinin type 1 - is distributed over cytoplasmic and nuclear membranes of many cell types (neurons, glia ... and neurons containing norepinephrine that are targeted by the currently used antidepressant drugs.[12] The SP receptor ... "Cytokine regulation of substance P expression in sympathetic neurons". Proceedings of the National Academy of Sciences of the ...
The Primary Afferent Neuron: A survey oj recent morpho:functional aspects. H held in Zurich on March 24th. 1988 in connection ... As sCientific research on the primary afferent neuron is so extensive. it is impossible to take inventory of all the present ... This book is based on contributions presented at the symposion "The Primary Afferent Neuron: A survey oj recent morpho: ... shows how morphological research contributes to our present -day concepts of the primary afferent neuron. Although fundamental ...
Unmyelinated type II afferent neurons report cochlear damage | PNASUnmyelinated type II afferent neurons report cochlear damage. Chang Liu, Elisabeth Glowatzki, and Paul Albert Fuchs ... Loud sound progressively damages type I afferent neurons and OHCs (1). Once damaged beyond repair, these do not regenerate as ... In support of this hypothesis, sparse (∼5% of all spiral ganglion neurons) unmyelinated type II afferents can survive cochlear ... 2015) Type II spiral ganglion afferent neurons drive medial olivocochlear reflex suppression of the cochlear amplifier. Nat ...
Unmyelinated type II afferent neurons report cochlear damage. Chang Liu, Elisabeth Glowatzki, and Paul Albert Fuchs ... Intriguingly, type II afferents remain intact in damaged regions of the cochlea. Here, we show that type II afferents are ... unmyelinated afferents-C fibers. Like somatic C fibers, unmyelinated type II cochlear afferents differ in size, number, and ... Type II afferents may be the cochleas nociceptors, prompting avoidance of further damage to the irreparable inner ear. ...
Efferent neurons carry nerve impulses from the central... ... Afferent neurons are special nerve cells that are responsible ... What Type of Neuron Carries Information to the CNS?. A: Afferent neurons, also known as sensory neurons, carry sensory ... Afferent neurons are also known as sensory receptor neurons. For example, a touch stimulus creates a sensation in the brain ... These are neurons that form a connection between two or more neurons creating a complex network of neurons. They are also ...
Fine afferent fibers respond to a number of potentially harmful physiological stimuli including pressure, heat and a variety of ... Nerve Growth Factor Dorsal Root Ganglion Dorsal Root Ganglion Neuron Afferent Nerve Terminal Inflammatory Hyperalgesia These ... Dray A. (1994) Influences of the Chemical Environment on Peripheral Afferent Neurons. In: Urban L. (eds) Cellular Mechanisms of ... Nowycky, M. (1992) Voltage gated ion channels in dorsal root ganglion neurons. In: Sensory Neurons: Diversity, Development and ...
... we report that peripheral nerve injury increases expression of the DNA methyltransferase DNMT3a in the injured DRG neurons via ... increases excitability in DRG neurons and leads to spinal cord central sensitization and neuropathic pain symptoms. These ... neurons, which may contribute to nerve injury-induced neuropathic pain. DNA methylation represses gene expression. Here, ... DNA methyltransferase DNMT3a contributes to neuropathic pain by repressing Kcna2 in primary afferent neurons. *Jian-Yuan Zhao1, ...
The Primary Afferent Neuron by Wolfgang Zenker, Winifred L. Neuhuber | WaterstonesBuy The Primary Afferent Neuron by Wolfgang Zenker, Winifred L. Neuhuber from Waterstones today! Click and Collect from your ... The Primary Afferent Neuron: A Survey of Recent Morpho-Functional Aspects (Paperback). Wolfgang Zenker (editor), Winifred L. ... As sCientific research on the primary afferent neuron is so extensive. it is impossible to take inventory of all the present ... This book is based on contributions presented at the symposion "The Primary Afferent Neuron: A survey oj recent morpho: ...
Afferent and efferent synaptic connections of somatostatin-immunoreactive neurons in the rat fascia dentata. - PubMed - NCBIAfferent and efferent synaptic connections of somatostatin-immunoreactive neurons in the rat fascia dentata.. Leranth C1, ... The aim of this study was to determine whether somatostatin (SS)-immunoreactive neurons of the rat fascia dentata are involved ... These observations suggest that SS-immunoreactive neurons in the dentate hilar area may be driven directly by their perforant ... Via their dendrites in the outer molecular layer, the SS-immunoreactive neurons receive synaptic inputs from perforant pathway ...
Afferent neuron Synonyms, Afferent neuron Antonyms | Thesaurus.comSynonyms for afferent neuron at Thesaurus.com with free online thesaurus, antonyms, and definitions. Find descriptive ... More words related to afferent neuron. nerve cell. noun. . cell of the nervous system ...
Intermittent Failure of Spike Propagation in Primary Afferent Neurons during Tactile Stimulation. Dhekra Al-Basha and Steven A ... Intermittent Failure of Spike Propagation in Primary Afferent Neurons during Tactile Stimulation ... Intermittent Failure of Spike Propagation in Primary Afferent Neurons during Tactile Stimulation ... Intermittent Failure of Spike Propagation in Primary Afferent Neurons during Tactile Stimulation ...
Afferent neuron | definition of afferent neuron by Medical dictionary... afferent neuron explanation free. What is afferent neuron? Meaning of afferent neuron medical term. What does afferent neuron ... Looking for online definition of afferent neuron in the Medical Dictionary? ... Related to afferent neuron: afferent pathway. afferent neuron. A neuron that conducts sensory impulses toward the brain or ... Afferent neurons mediating escape swimming of the marine mollusc, Tritonia.. Evidence that the swim afferent neurons of ...
2012) Activation of VTA GABA neurons disrupts reward consumption. Neuron 73:1184-1194, doi:10.1016/j.neuron.2012.02.016, pmid: ... neurons within the VTA. The mean amplitude of the IPSCs onto confirmed TH(+) neurons was larger than onto TH(−) neurons (128.9 ... Opioid Modulation of Ventral Pallidal Afferents to Ventral Tegmental Area Neurons. Gregory O. Hjelmstad, Yanfang Xia, Elyssa B. ... Opioid Modulation of Ventral Pallidal Afferents to Ventral Tegmental Area Neurons. Gregory O. Hjelmstad, Yanfang Xia, Elyssa B. ...
Comparison of primary afferent and glutamate excitation of neurons in the mammalian spinal dorsal horn. SP Schneider and ER ... Comparison of primary afferent and glutamate excitation of neurons in the mammalian spinal dorsal horn ... Comparison of primary afferent and glutamate excitation of neurons in the mammalian spinal dorsal horn ... Comparison of primary afferent and glutamate excitation of neurons in the mammalian spinal dorsal horn ...
Information about complex fingertip parameters in individual human tactile afferent neurons... Saal, Hannes P ... Although information in tactile afferent neurons represented by firing rates has been studied extensively over nearly a century ... We conclude that information about tactile stimuli in timing of spikes in primary afferents, even if limited to the first ... Here, we used information theory to compare the information content in the discharges of 92 tactile afferents distributed over ...
Two populations of extrinsic primary afferent neurons, vagal and spinal, subserve this goal through different mechanisms. These ... in identifying molecular nocisensors on afferent neurons and in dissecting the signaling mechanisms whereby afferent neurons ... Two populations of extrinsic primary afferent neurons, vagal and spinal, subserve this goal through different mechanisms. These ... Spinal afferents, in addition, can initiate protective tissue reactions at the site of assault through release of calcitonin ...
7D,E,I,J). In the L4 DRG of naive rats, 34.1 ± 2.7% of the neurons were TRPV1 mRNA-positive neurons. The number of neurons ... of the neurons were BDNF mRNA-positive neurons. The percentage of BDNF mRNA-positive neurons in the vehicle group at 7 d after ... Fukuoka T, Noguchi K (2002) Contribution of the spared primary afferent neurons to the pathomechanisms of neuropathic pain. Mol ... At least 250 neurons from each DRG of each rat were measured. The number of positively labeled DRG neurons was divided by the ...
Vagal afferent neurons in the nodose ganglia express MC4 but not MC3 receptors. mRNA for MC4R, but not MC3R, was detected in ... Vagal afferent fibers use glutamate as their main transmitter onto NTS neurons (Andresen and Yang, 1990; Smith et al., 1998; ... 2003) Cholecystokinin activates both A- and C-type vagal afferent neurons. Am J Physiol Gastrointest Liver Physiol 285:G1204- ... Because the major source of glutamatergic input to neurons of the NTS originates from vagal afferent fibers (Champagnat et al ...
Response properties of electrosensory afferent fibers and secondary brain stem neurons in the paddlefish | Journal of...... a neuron that sends collaterals to neighboring neurons has to rely on the fact that the neighboring neurons also have adjacent ... Tricas, T. C. and New, J. G. (1998). Sensitivity and response dynamics of elasmobranch electrosensory primary afferent neurons ... Response properties of electrosensory afferent fibers and secondary brain stem neurons in the paddlefish ... Response properties of electrosensory afferent fibers and secondary brain stem neurons in the paddlefish ...
Synaptic convergence of afferent inputs in primary infrared-sensitive nucleus (LTTD) neurons of rattlesnakes (Crotalinae) as ... Synaptic convergence of afferent inputs in primary infrared-sensitive nucleus (LTTD) neurons of rattlesnakes (Crotalinae) as ... Synaptic convergence of afferent inputs in primary infrared-sensitive nucleus (LTTD) neurons of rattlesnakes (Crotalinae) as ... Synaptic convergence of afferent inputs in primary infrared-sensitive nucleus (LTTD) neurons of rattlesnakes (Crotalinae) as ...
PRIME PubMed | [Immunoreactivity of the synapses on the primary afferent axons and sensory neurons of the spinal cord Lampetra...Immunoreactivity of the synapses on the primary afferent axons and sensory neurons of the spinal cord Lampetra fluviatilis were ... AnimalsAntibodiesAxonsGlutamic AcidImmunohistochemistryLampreysMicroscopy, ImmunoelectronNeurons, AfferentSensory Receptor ... Immunoreactivity of the synapses on the primary afferent axons and sensory neurons of the spinal cord Lampetra fluviatilis].. ... TY - JOUR T1 - [Immunoreactivity of the synapses on the primary afferent axons and sensory neurons of the spinal cord Lampetra ...
Aberrant Innervation of Lamina II Neurons by Aβ Afferents Message Subject (Your Name) has forwarded a page to you from Journal ... Aberrant Innervation of Lamina II Neurons by Aβ Afferents. Ikuhide Kohama, Kuniko Ishikawa and Jeffery D. Kocsis ... Aberrant Innervation of Lamina II Neurons by Aβ Afferents ... Aberrant Innervation of Lamina II Neurons by Aβ Afferents. ... Rostral Ventromedial Medulla Neurons That Project to the Spinal Cord Express Multiple Opioid Receptor Phenotypes ...
The Neuropeptide Y Y2 receptor is co-expressed with Nppb in primary afferent neurons and Y2 activation reduces histaminergic ... The Neuropeptide Y Y2 receptor is co-expressed with Nppb in primary afferent neurons and Y2 activation reduces histaminergic ... The Neuropeptide Y Y2 receptor is co-expressed with Nppb in primary afferent neurons and Y2 activation reduces histaminergic ... The Neuropeptide Y Y2 receptor is co-expressed with Nppb in primary afferent neurons and Y2 activation reduces histaminergic ...
EFFECTS OF AGING ON NEUROCHEMICAL PROPERTIES OF MOUSE CORNEAL COLD SENSORY NEURONS, CHANGES IN MORPHOLOGY IN THEIR AFFERENT ... EFFECTS OF AGING ON NEUROCHEMICAL PROPERTIES OF MOUSE CORNEAL COLD SENSORY NEURONS, CHANGES IN MORPHOLOGY IN THEIR AFFERENT ... EFFECTS OF AGING ON NEUROCHEMICAL PROPERTIES OF MOUSE CORNEAL COLD SENSORY NEURONS, CHANGES IN MORPHOLOGY IN THEIR AFFERENT ... TG neurons projecting to the cornea were traced with Fast Blue applied onto the cornea of the mice and were identified in TG ...
Verberne AJM, Saita M, and Sartor DM. Chemical stimulation of vagal afferent neurons and sympathetic vasomotor tone. Brain Res ... Only one neuron was studied in each experiment. CCK-sensitive RVLM presympathetic neurons are a subpopulation of the total ... CCK-induced inhibition of presympathetic vasomotor neurons: dependence on subdiaphragmatic vagal afferents and central NMDA ... CCK-induced inhibition of presympathetic vasomotor neurons: dependence on subdiaphragmatic vagal afferents and central NMDA ...
H. Hirata, I. D. Meng; A Special Type of Primary Afferent Sensory Neuron Plays a Critical Role in Tear Production: Implications ... A Special Type of Primary Afferent Sensory Neuron Plays a Critical Role in Tear Production: Implications for Dry Eye Disease ... A Special Type of Primary Afferent Sensory Neuron Plays a Critical Role in Tear Production: Implications for Dry Eye Disease ... 2) These neurons displayed the highly sensitive response to cooling (less than 1oC) of cornea as well as a "paradoxical" ...
FibersInterneuronsReceptorsStimuliExcitatoryInnervateSynapsesNeuronalStimulationTypes of neuronsAxonNeurotransmitterVentralImpulsesPeripheralSynapseSignalsAlpha motor nNervesPathwaysEfferent neuronsCell bodiesInhibitoryLower motor nUpper motor nReceptorInhibitionGamma motor nResponsesNociceptiveDorsal root ganProjectionsVagal afferentsVisceralAction potentialsTransmitBrainstemBodiesGABAergicStimulusSympatheticTerminalsNeuralInterneuronInputsDendritesPrimary afferent neuronDepolarizationGangliaIntrafusalModulateRatsIntrinsicInnervationSpinal dorsal hornCholinergicPostsynapticParasympatheticAxons of sensory neuronsMotorSomaticSynaptic transmissionOlfactoryNervous systemPeptideMultipolar
- This differential behavior invites comparison with somatic pain responses driven by the anatomically distinct subset of small-diameter, unmyelinated afferents-C fibers. (pnas.org)
- Like somatic C fibers, unmyelinated type II cochlear afferents differ in size, number, and innervation pattern from type I afferents that encode sound. (pnas.org)
- Fine afferent fibers respond to a number of potentially harmful physiological stimuli including pressure, heat and a variety of noxious chemicals. (springer.com)
- We conclude that a subset of spinal neurons directly excited by dorsal root fibers have excitatory membrane receptors activated by L-glutamate. (jneurosci.org)
- This conclusion is consistent with the concept that L-glutamate or a substance binding to the receptors it activates is released from the central terminals of some primary afferent fibers and mediates fast synaptic transmission from them to certain spinal neurons in the dorsal horn. (jneurosci.org)
- Satiation signals such as gastric distention or nutrients in the intestine reach the nucleus tractus solitarius (NTS) via vagal afferent fibers or circulating hormones. (jneurosci.org)
- In order to gain insights into the algorithms involved, we compared the response properties of units in the dorsal octavolateral nucleus (DON) with primary afferent fibers in the paddlefish. (biologists.org)
- To begin to address this question, we investigated signal processing in the first relay center of the paddlefish, the dorsal octavolateral nucleus (DON), by comparing the response properties of the second order neurons in the DON with those of the primary afferent fibers, which carry the information from peripheral receptors to the brain. (biologists.org)
- A presumed, yet so far unknown neuronal connectivity within this central nucleus exerts a synaptic computation that constrains the relatively large receptive field of primary afferent fibers. (biologists.org)
- the gastrointestinal peptide cholecystokinin (CCK) is a powerful stimulant of gastrointestinal vagal afferent nerve fibers ( 1 , 12 , 24 , 25 ) and has selective effects on sympathetic vasomotor outflow that are dependent on intact vagal afferents ( 17 ). (physiology.org)
- Spinal neuronal responses to stimulation of cardiopulmonary sympathetic afferent (CPS) fibers were studied in 25 alpha-chloralose-anesthetized cats. (semanticscholar.org)
- Eighty-two neurons located in the T7-T9 segments were tested for responses to electrical stimulation of CPS fibers. (semanticscholar.org)
- Activation of vagal afferent fibers results in inhibition of food intake, gastric emptying, and stimulation of pancreatic secretion. (eurekaselect.com)
- Intravenous administration of a 5-HT3 antagonist blocked these responses suggesting that nodose neuronal responses to luminal osmolarity and to the digestion products of carbohydrates are dependent on the release of endogenous 5- HT from the mucosal enterochromaffin (EC) cells, which acts on the 5-HT3 receptors on vagal afferent fibers to stimulate vagal afferent neurons. (eurekaselect.com)
- Alpha motor neurons are distinct from gamma motor neurons , which innervate intrafusal muscle fibers of muscle spindles . (wikipedia.org)
- An alpha motor neuron and the muscle fibers it innervates is a motor unit . (wikipedia.org)
- The nerve fibers are actually extensions of the cytoplasm surrounding the nucleus of the neuron. (thefreedictionary.com)
- The axons of motor neurons form synapses with skeletal fibers to produce motion. (thefreedictionary.com)
- The axon of a motor neuron divides just before it enters the muscle fibers and forms synapses near the nuclei of muscle fibers. (thefreedictionary.com)
- We were concerned with the afferent fibers in the ventral root that travel distally and then enter the spinal cord through the dorsal root. (utmb.edu)
- Spindle afferents (Ia fibers) make the strongest connections with motoneurons supplying the same (homonymous) muscle but make few or no connections with motoneurons supplying antagonistic or functionally unrelated muscles. (jneurosci.org)
- Dorsal root potentials and primary afferent depolarization, indicators of presynaptic inhibition at the central terminals of low-threshold myelinated fibers, are diminished after complete sciatic nerve axotomy ( Wall and Devor, 1981 ). (jneurosci.org)
- HRP-labeled tooth pulp afferent fibers projected to all four rostrocaudal subdivisions of the ipsilateral trigeminal brainstem nuclear complex (TBNC) and to the upper cervical spinal cord. (elsevier.com)
- Sengupta JN, Gebhart GF (1994) Gastrointestinal afferent fibers and sensation. (springer.com)
- C tactile (CT) afferents are a class of nerve fibers that innervate the human skin. (wikipedia.org)
- CT afferents belong to group C nerve fibers, and are unmyelinated, have a small diameter and slow conduction velocity. (wikipedia.org)
- CT afferents project to the insular cortex in the brain, and the firing frequency of CT fibers correlate with perceived pleasantness of skin stroking. (wikipedia.org)
- In the context of a given brain region, afferents are arriving fibers while efferents are exiting fibers. (wikipedia.org)
- All of the axons in the dorsal root, which contains afferent nerve fibers, are used in the transduction of somatosensory information. (wikipedia.org)
- For example, a specific muscle fiber called an intrafusal muscle fiber is a type of afferent neuron that lies parallel to the extrafusal muscle fibers thus functions as a stretch receptor by detecting muscle length. (wikipedia.org)
- Types of afferent fibers include the general somatic (GSA), the general visceral (GVA), the special somatic (SSA) and the special visceral afferent fibers (SVA). (wikipedia.org)
- Modulatory interneurons are neurons that are physically situated next to muscle fibers and innervate the nerve fibers which allow for some orienting movement. (wikipedia.org)
- Many of the nonspiking neurons are found near neuromuscular junctions and exist as long fibers that help to innervate certain motor nerves such as the thoracic-coxal muscle receptor organ (TCMRO) of a crab. (wikipedia.org)
- Alpha motor neurons innervate extrafusal muscle fibers that generate force at neuromuscular junctions at the start of muscle contraction. (wikipedia.org)
- Gamma motor neurons innervate intrafusal muscle fibers that control the sensitivity of muscle spindles to stretch. (wikipedia.org)
- These neurons mediate the activity of nociceptive and temperature afferent fibers. (wikipedia.org)
- The neurons of this layer are only C fibers and contain almost no myelin. (wikipedia.org)
- The cell bodies of visceral afferent fibers of the vagus nerve are located bilaterally in the inferior ganglion of the vagus nerve (nodose ganglia). (wikipedia.org)
- It also has some afferent fibers that innervate the inner (canal) portion of the outer ear (via the auricular branch, also known as Alderman's nerve) and part of the meninges. (wikipedia.org)
- The secondary nerve association involves an efferent and afferent pathway that measure the stress and strain placed on the muscle (usually the extrafusal fibers connected from the muscle portion to a bone). (wikipedia.org)
- As intrafusal muscle fibers, nuclear chain fibers both send afferent (sensory) innervation and receive efferent (motor) innervation. (wikipedia.org)
- The afferent innervation is via type Ia sensory fibers and type II sensory fibers. (wikipedia.org)
- Stimulation of γ neurons causes the nuclear chain to shorten along with the extrafusal muscle fibers. (wikipedia.org)
- Aδ fibers are characterized by thin axons and thin myelin sheaths, and are either D-hair receptors or nociceptive neurons. (wikipedia.org)
- C fibers account for 60-70% of primary afferent neurons that innervate the skin. (wikipedia.org)
- C-fiber nociceptors that respond only to mechanical stimuli are called C-mechanonociceptors (C-M). Other groups of C fibers include C-fiber low threshold mechanoreceptors (C-LT), which are involved in nondiscriminative touch, and mechanically insensitive afferents (MIA), which lack mechanosensitivity and are also known as "silent" or "sleeping" nociceptors. (wikipedia.org)
- Sensory information conveyed by primary type Ia sensory fibers and secondary type II sensory fibers, which spiral around muscle fibres within the spindle Motor action by up to a dozen gamma motor neurons and to a lesser extent by one or two beta motor neurons that activate muscle fibres within the spindle. (wikipedia.org)
- Muscle spindles are composed of three to twelve muscle fibers, of which there are three types: dynamic nuclear bag fibers (bag1 fibers), static nuclear bag fibers (bag2 fibers), nuclear chain fibers and afferent nerve fibers. (wikipedia.org)
- Activation of the neurons causes a contraction and stiffening of the end parts of the muscle spindle muscle fibers. (wikipedia.org)
- Fusimotor neurons are classified as static or dynamic according to the type of muscle fibers they innervate and their effects on the responses of the Ia and II sensory neurons innervating the central, non-contractile part of the muscle spindle. (wikipedia.org)
- They increase the stretch-sensitivity of the Ia afferents by stiffening the bag1 intrafusal fibers. (wikipedia.org)
- they make synapses at either or both of the ends of the intrafusal muscle fibers and regulate the sensitivity of the sensory afferents, which are located in the non-contractile central (equatorial) region. (wikipedia.org)
- The function of the gamma motor neurons is not to supplement the force of muscle contraction provided by the extrafusal fibers, but to modify the sensitivity of the muscle spindle sensory afferents to stretch. (wikipedia.org)
- Upon release of acetylcholine by the active gamma motor neuron, the end portions of the intrafusal muscle fibers contract, thus elongating the non-contractile central portions (see "fusimotor action" schematic below). (wikipedia.org)
- From there, acetylcholine is released from the axon terminal knobs of alpha motor neurons and received by postsynaptic receptors (Nicotinic acetylcholine receptors) of muscles, thereby relaying the stimulus to contract muscle fibers. (wikipedia.org)
- As a general rule, in the thorax and abdomen, general visceral afferent (GVA) pain fibers follow sympathetic fibers back to the same spinal cord segments that gave rise to the preganglionic sympathetic fibers. (wikipedia.org)
- Also, the dermatomes of this region of the body wall and upper limb have their neuronal cell bodies in the same dorsal root ganglia (T1-5) and synapse in the same second order neurons in the spinal cord segments (T1-5) as the general visceral sensory fibers from the heart. (wikipedia.org)
- Convergent projection proposes that afferent nerve fibers from tissues converge onto the same spinal neuron, and explains why referred pain is believed to be segmented in much the same way as the spinal cord. (wikipedia.org)
- The axons (as afferent nerve fibers), of sensory neurons connect with, or respond to, various receptor cells. (wikipedia.org)
- Conversely, the rostral and caudal areas have lower capillary density and are mostly made of nerve fibers with fewer neurons and glial cells seen in this area. (wikipedia.org)
- SFO neurons have also been experimentally shown to broadcast efferent projections to regions involved in cardiovascular regulation including the lateral hypothalamus, with fibers terminating in the supraoptic (SON) and paraventricular (PVN) nuclei, and the anteroventral 3rd ventricle (AV3V) with fibers terminating in the OVLT and the median preoptic area. (wikipedia.org)
- Brainstem afferents in DLF include fibers coming from the parabrachial area, which conveys taste & general visceral sensation to the hypothalamus from the nucleus of the tractus solitarius in the medulla. (wikipedia.org)
- These fibers continue on into the spinal cord where they synapse with preganglionic autonomic neurons. (wikipedia.org)
- In addition, the spindle also has a motor efferent innervation carried by the efferent nerve fibers of gamma motor neurons, which is used by the nervous system to modify the spindle's sensitivity. (wikipedia.org)
- A gamma motor neuron (γ motor neuron), also called gamma motoneuron, is a type of lower motor neuron that takes part in the process of muscle contraction, and represents about 30% of ( Aγ ) fibers going to the muscle. (wikipedia.org)
- Muscle spindles can be made up of three different types of muscle fibers: dynamic nuclear bag fibers (bag1 fibers), static nuclear bag fibers (bag2 fibers), nuclear chain fibers, and the axons of sensory neurons. (wikipedia.org)
- Alpha motor neurons, the most abundant type, are used in the actual force for muscle contraction and therefore innervate extrafusal muscle fibers (muscle fibers outside of the muscle spindle). (wikipedia.org)
- Gamma motor neurons, on the other hand, innervate only intrafusal muscle fibers (within the muscle spindle), whereas beta motor neurons, which are present in very low amounts, innervate both intrafusal and extrafusal muscle cells. (wikipedia.org)
- However, with alpha gamma co-activation where both alpha neurons and gamma neurons are present, muscle fibers with the muscle spindles are pulled parallel to the extrafusal contraction causing the muscle movement. (wikipedia.org)
- The firing of gamma motor neurons in sync with alpha motor neurons pulls muscle spindles from polar ends of the fibers as this is where gamma motor neurons innervate the muscle. (wikipedia.org)
- Because beta motor neurons innervate extrafusal as well as intrafusal muscle fibers, they are more specifically named skeletofusimotor neurons. (wikipedia.org)
- Afferent nerve fibers responsible for sensory stimulus detection and feedback are especially sensitive to stimulation. (wikipedia.org)
- This results from the specialized mechanoreceptor cells that are superimposed upon the afferent nerve fibers. (wikipedia.org)
- They are less sensitive than the encapsulated afferent fibers and generally function in the perception of pain. (wikipedia.org)
- The afferent limb has nerve fibers running within the optic nerve (CN II). (wikipedia.org)
- Each Edinger-Westphal nucleus gives rise to preganglionic parasympathetic fibers which exit with CN III and synapse with postganglionic parasympathetic neurons in the ciliary ganglion. (wikipedia.org)
- Neurons of the cingulum receive afferent fibers from the parts of the thalamus that are associated with the spinothalamic tract. (wikipedia.org)
- All voluntary movement relies on spinal lower motor neurons, which innervate skeletal muscle fibers and act as a link between upper motor neurons and muscles. (wikipedia.org)
- Lower motor neurons are classified based on the type of muscle fiber they innervate: Alpha motor neurons (α-MNs) innervate extrafusal muscle fibers, the most numerous type of muscle fiber and the one involved in muscle contraction. (wikipedia.org)
- Beta motor neurons (β-MNs) innervate intrafusal fibers of muscle spindles with collaterals to extrafusal fibers (type of slow twitch fibers). (wikipedia.org)
- Gamma motor neurons (γ-MNs) innervate intrafusal muscle fibers, which together with sensory afferents compose muscle spindles. (wikipedia.org)
- This sensory information travels along afferent nerve fibers in an afferent or sensory nerve, to the brain via the spinal cord. (wikipedia.org)
- It is a cable-like bundle of the afferent nerve fibers coming from sensory receptors in the peripheral nervous system (PNS). (wikipedia.org)
- Afferent nerve fibers link the sensory neurons throughout the body, in pathways to the relevant processing circuits in the central nervous system. (wikipedia.org)
- Afferent nerve fibers are often paired with efferent nerve fibers from the motor neurons (that travel from the CNS to the PNS), in mixed nerves. (wikipedia.org)
- Afferent nerve fibers leave the sensory neuron from the dorsal root ganglia of the spinal cord, and motor commands carried by the efferent fibers leave the cord at the ventral roots. (wikipedia.org)
- The spinal cord functions primarily in the transmission of nerve signals from the motor cortex to the body, and from the afferent fibers of the sensory neurons to the sensory cortex. (wikipedia.org)
- Ventral roots consist of efferent fibers that arise from motor neurons whose cell bodies are found in the ventral (or anterior) gray horns of the spinal cord. (wikipedia.org)
- this contrasts inner hair cells (IHC) that have only afferent innervation (30+ nerve fibers per one hair) but are heavily connected. (wikipedia.org)
- The opposite direction of neural activity is afferent conduction, which carries impulses by way of the afferent nerve fibers of sensory neurons. (wikipedia.org)
- The efferent nerve fibers of motor neurons are involved in muscle control, both skeletal and smooth muscle. (wikipedia.org)
- Subtypes of these fibers include (GSE): alpha motor neurons (α) - these target extrafusal muscle fibers, and gamma motor neurons (γ) that target intrafusal muscle fibers. (wikipedia.org)
- The Gate-Control Theory was first proposed in the 1960s and it states that the concurrent activation of tactile afferent nerve fibers reduces inhibits activation of nociceptive afferent fibres. (wikipedia.org)
- A nerve is an enclosed, cable-like bundle of axons (nerve fibers, the long and slender projections of neurons) in the peripheral nervous system. (wikipedia.org)
- Bundles of fibres or axons, in the peripheral nervous system are called nerves, and bundles of afferent fibers are known as sensory nerves. (wikipedia.org)
- The axons from the lower motor neurons are efferent nerve fibers that carry signals from the spinal cord to the effectors. (wikipedia.org)
- Alpha motor neurons innervate extrafusal muscle fibers, which are the main force-generating component of a muscle. (wikipedia.org)
- It is an enclosed, cable-like bundle of efferent nerve fibers (the axons of motor neurons) in the peripheral nervous system (PNS). (wikipedia.org)
- The afferent nerve fibers of the olfactory receptor neurons, transmit nerve impulses about odors to the central nervous system, where they are perceived by the sense of smell (olfaction). (wikipedia.org)
- Thalamocortical (TC) fibers have been referred to as one of the two constituents of the isothalamus, the other being micro neurons. (wikipedia.org)
- The PIR neurons cluster together creating "densely terminating afferent fibers…forming a core imposed on a diffuse background matrix of PIR cells" (Jones 2001). (wikipedia.org)
- The interneurons facilitate the movement of information between the efferent neurons and the afferent neurons. (reference.com)
- Synapses between primary afferent neurons and the giant interneurons also occur in the periphery, in the antenniform leg, a feature first discovered by Foelix (1975). (thefreedictionary.com)
- Alpha motor neurons receive input from a number of sources, including upper motor neurons , sensory neurons , and interneurons . (wikidoc.org)
- N -(1-azabicyclo[2.2.ct-3-yl)-6-chloro-4-methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-8-carboxamide hydrochloride] were investigated on dorsal horn interneurons mediating reflex actions of group II muscle afferents. (jneurosci.org)
- Effects of agonists were tested on extracellularly recorded responses of individual interneurons evoked by electrical stimulation of group II afferents in a muscle nerve. (jneurosci.org)
- The results show that both 5-HT 1A&7 and 5-HT 3 membrane receptors are involved in counteracting the activation of dorsal horn interneurons by group II afferents. (jneurosci.org)
- Because only quantitative differences were found within the sample of the tested neurons, these results suggest that modulatory actions of 5-HT on excitatory and inhibitory interneurons might be similar. (jneurosci.org)
- In previous studies, axons possessing 5-HT 3 receptors were found to be excitatory, and as 2-Me 5-HT depressed transmission to dorsal horn interneurons, the results indicate that 5-HT operates at 5-HT 3 receptors presynaptic to these neurons to depress excitatory transmission. (jneurosci.org)
- The present study was undertaken to analyze its effects at the level of one particular population of spinal interneurons involved in coordinating motor responses: dorsal horn interneurons in pathways between group II muscle afferents and either ipsilateral or contralateral α motoneurons. (jneurosci.org)
- The pathway from group II afferents via dorsal horn and commissural interneurons is thus trisynaptic and supplements the disynaptic pathway via commissural interneurons, as schematically indicated in Figure 1 A . 5-HT could modulate crossed actions of group II afferents at the level of both of these interneurons. (jneurosci.org)
- Interneurons aren't motor or sensory types of neurons. (hubpages.com)
- intrinsic enteric neurons are recognized: sensory neurons, interneurons, and motor neurons. (britannica.com)
- Sensory neuron s, activated by either mechanical or chemical stimulation of the innermost surface of the gut, transmit information to interneurons located within the Auerbach and the Meissner plexi, and the interneurons relay the information to motor neurons. (britannica.com)
- In contrast, the ENS in the small intestine and colon contains full reflex circuits, including sensory neurons, interneurons and several classes of motor neuron, through which muscle activity, transmucosal fluid fluxes, local blood flow and other functions are controlled. (springer.com)
- This process is carried out through the activity of sensory neurons, interneurons, and motor neurons. (wikipedia.org)
- These modulatory interneurons are usually nonspiking neurons. (wikipedia.org)
- Advances in studying nonspiking neurons included determining new delineations among the different types of interneurons. (wikipedia.org)
- The major difference between these two neuron types is the manner in which encoded information is propagated along a length to the central nervous system or to some locus of interneurons, such as a neuromuscular junction. (wikipedia.org)
- Interneurons" is a name used to indicate neurons that are neither sensory neurons nor motory in nature, but function as an intermediary processing and transmission state for signals that have been received via dorsal root ganglia cells. (wikipedia.org)
- There have been classifications based on the larger group "interneurons" where pre-motor nonspiking neurons are referred to as postlateral (PL) or anteriolateral (AL) interneurons, with AL interneurons divided into three types of interneurons based on staining. (wikipedia.org)
- The anterior grey column, also known as the anterior horn of spinal cord, comprises three different types of neurons: large alpha motor neurons, medium gamma motor neurons, and small neurons thought to be interneurons. (wikipedia.org)
- The majority of posterior column projection neurons are located in lamina I, however most neurons in this layer are interneurons. (wikipedia.org)
- The grey column of the spinal cord appears to have groups of small neurons, often referred to as spinal interneurons, that are neither primary sensory cells nor motor neurons. (wikipedia.org)
- In particular, the cell bodies of the spinal interneurons are found in the grey matter of the spinal cord, which also contains the motor neurons. (wikipedia.org)
- In the mouse's dorsal alar plate, six progenitor domains give rise to dI1-dI6 neurons and two classes of dorsal interneurons. (wikipedia.org)
- In addition, in the ventral half of the neural tube, four classes of (CPG) interneurons known as V0, V1, V2, and V3 neurons are generated. (wikipedia.org)
- V3 neurons are excitatory commissural interneurons that extend caudally projecting primary axons. (wikipedia.org)
- The V1 neurons are inhibitory interneurons with axons that project ipsilaterraly and rostrally. (wikipedia.org)
- The class V1 neurons give rise to two local circuit inhibitory neurons known as Renshaw cells and Ia inhibitory interneurons. (wikipedia.org)
- Research on cat's spinal cord has shown that at the spinal cord level sensory afferents and descending motor pathways converge onto common spinal interneurons. (wikipedia.org)
- A decrease in the large fiber input decreases the activity of interneurons inhibiting nociceptive neurons i.e. loss of afferent inhibition. (wikipedia.org)
- The Ia afferent signal is also transmitted polysynaptically through interneurons (Ia inhibitory interneurons), which inhibit alpha motoneurons of antagonist muscles, causing them to relax. (wikipedia.org)
- The next simplest reflex arc is a three-element chain, beginning with sensory neurons, which activate interneurons in the spinal cord, which then activate motor neurons. (wikipedia.org)
- In the spinal cord reflex pathway the afferent neuron transmits information to spinal cord interneurons. (wikipedia.org)
- These interneurons act collectively, process and make sense of inbound stimuli, and stimulate effector neurons acting as an integration center. (wikipedia.org)
- In humans, other primates, and rodents, these interneurons respond to salient environmental stimuli with stereotyped responses that are temporally aligned with the responses of dopaminergic neurons of the substantia nigra. (wikipedia.org)
- The best known are parvalbumin expressing interneurons, also known as fast-spiking interneurons, which participate in powerful feedforward inhibition of principal neurons. (wikipedia.org)
- Recently, two types of neuropeptide-y expressing GABAergic interneurons have been described in detail, one of which translates synchronous activity of cholinergic interneurons into inhibition of principal neurons. (wikipedia.org)
- The parvocellular neurosecretory cells include those that make: Corticotropin-releasing hormone (CRH), which regulates ACTH secretion from the anterior pituitary gland Vasopressin, which also regulates ACTH secretion (vasopressin and CRH act synergistically to stimulate ACTH secretion) Thyrotropin-releasing hormone (TRH), which regulates TSH and prolactin secretion As well as neuroendocrine neurons, the PVN contains interneurons and populations of neurons that project centrally (i.e., to other brain regions). (wikipedia.org)
- A gating signal from the gatekeeper triggers these inhibitory interneurons in order to prevent one set of neurons from firing even when stimulated by another set. (wikipedia.org)
- Interneurons connect neurons to other neurons within the same region of the brain or spinal cord in neural networks. (wikipedia.org)
- They suggested that both touch and pain afferent fibres synapse on to 'projection cells' and inhibitory interneurons in the dorsal horn. (wikipedia.org)
- More recently neurophysiological studies in animals have indicated that the wide range dynamic neurons (WDR neurons) in the dorsal horn are the homologue of Wall and Melzack's proposed projector neurons and inhibitory interneurons. (wikipedia.org)
- Axons from upper motor neurons synapse onto interneurons in the spinal cord and occasionally directly onto lower motor neurons. (wikipedia.org)
- This layer is home to wide dynamic range tract neurons, interneurons and propriospinal neurons. (wikipedia.org)
- In humans and other mammals, neurons in the PMC send descending excitatory projections to spinally located parasympathetic neurons controlling the detrusor muscle of the bladder and inhibitory interneurons regulating Onuf's nucleus. (wikipedia.org)
- Selective activation of P2Y receptors increased type II afferent excitability by the closure of KCNQ-type potassium channels, a potential mechanism for the painful hypersensitivity (that we term "noxacusis" to distinguish from hyperacusis without pain) that can accompany hearing loss. (pnas.org)
- Afferent neurons are special nerve cells that are responsible for carrying nerve impulses from the receptors to the central nervous system. (reference.com)
- The first discusses the peripheral sensory receptors, the second the spinal ganglion cells, and the third the central terminals of primary afferents. (waterstones.com)
- The actions of L-glutamate and agonists, agents blocking their membrane receptors and dorsal root afferent volleys, were compared on intracellularly recorded neuronal activity in an in vitro horizontal slice preparation of the hamster spinal dorsal horn. (jneurosci.org)
- Release of α-melanocyte-stimulating hormone (αMSH) from terminals of POMC neurons modulates food intake and energy balance through activation of the melanocortin-3 and -4 receptors (MC3R and MC4R, respectively). (jneurosci.org)
- This study was designed to determine whether this effect involved subdiaphragmatic vagal afferents and/or central N -methyl- d -aspartic acid (NMDA) receptors. (physiology.org)
- These results suggest that the effects of systemic CCK on the discharge of RVLM presympathetic neurons is mediated via an action on receptors located on subdiaphragmatic vagal afferents. (physiology.org)
- Thus in addition to examining the role of subdiaphragmatic vagal afferents in the actions of systemic CCK on sympathetic vasomotor outflow, the importance of central NMDA receptors has been assessed by examining the effect of administration of a centrally active NMDA receptor antagonist, dizocilpine (MK-801), on CCK-induced inhibition of RVLM presympathetic neurons. (physiology.org)
- This project investigated the role of HMGB1 through its receptors Receptor for Advanced Glycation End-products (RAGE) and Toll-Like Receptor 4 (TLR4) as it pertained to the development of chronic inflammation and pathology in small diameter, nociceptive sensory neurons. (iupui.edu)
- CCK acted on both high- and lowaffinity CCK-A receptors present on distinct vagal primary afferent neurons. (eurekaselect.com)
- The nodose ganglion contains neurons that may possess only high- or low-affinity CCK-A receptors or 5-HT3 receptors. (eurekaselect.com)
- Some neurons that express high-affinity CCK-A receptors also express 5-HT3 receptors and (or) secretin receptors. (eurekaselect.com)
- Some neurons that possess low-affinity CCK-A receptor colocalize with leptin receptors (OB-Rs). (eurekaselect.com)
- Background and Aims: The gastrointestinal hormone cholecystokinin (CCK) plays an important role in regulating meal size and duration by activating CCK1 receptors on vagal afferent neurons (VAN). (elsevier.com)
- Dopamine D1-like Receptors Regulate Constitutive, μ-Opioid Receptor-Mediated Repression of Use-Dependent Synaptic Plasticity in Dorsal Horn Neurons: More Harm than Good? (jneurosci.org)
- During blockade of either D1R or MOR, low-frequency (0.2 or 3 Hz) stimulation (LFS) to the sciatic nerve induced long-term potentiation (LTP) of C-fiber-evoked potentials, revealing a constituent role of both receptors in repressing afferent-induced synaptic plasticity. (jneurosci.org)
- CCK is released from DMH neurons in response to repeated postsynaptic depolarizations, and acts in an autocrine fashion on CCK2 receptors to enhance postsynaptic NMDA receptor function and liberate the retrograde transmitter, nitric oxide (NO). NO subsequently acts presynaptically to enhance GABA release through a soluble guanylate cyclase-mediated pathway. (jneurosci.org)
- To simulate the spike responses of all the major types of cutaneous tactile afferents, we proposed an electromechanical circuit model, in which a two-channel filter was developed to characterize the mechanical selectivity of tactile receptors, and a spike synthesizer was designed to recreate the action potentials evoked in afferents. (frontiersin.org)
- Tactile receptors are sensory receptors that respond to mechanical pressure or distortion by producing action potentials (spikes) in their associated afferents ( Zhu and Rozell, 2015 ). (frontiersin.org)
- Then it carried out through afferent nerve/pathway to integrating centre for interpret Integrating centre receives impulses from various receptors. (scribd.com)
- All three of these receptors stimulate an action potential in afferent nerves (sensory neurons) found within the various layer of the skin and body. (wikipedia.org)
- Cutaneous receptors are at the ends of afferent neurons. (wikipedia.org)
- Disruption of retinogeniculate afferent segregation by antagonists to NMDA receptors. (wikipedia.org)
- Once it became apparent that interoceptive receptors are present in many tissues of the body other researchers began to investigate afferent body-to-brain signals, mainly by conducting animal experiments to see if interoceptive conditioning was possible. (wikipedia.org)
- Proton-sensing G protein-coupled receptors are expressed by DRG sensory neurons and might play a role in acid-induced nociception. (wikipedia.org)
- The nerve endings of dorsal root ganglion neurons have a variety of sensory receptors that are activated by mechanical, thermal, chemical, and noxious stimuli. (wikipedia.org)
- Since many of the same neurotransmitters are found in the ENS as the brain, it follows that myenteric neurons can express receptors for both peptide and non-peptide (amines, amino acids, purines) neurotransmitters. (wikipedia.org)
- Generally, expression of a receptor is limited to a subset of myenteric neurons, with probably the only exception being expression of nicotinic cholinergic receptors on all myenteric neurons. (wikipedia.org)
- It is the inner hair cells of the organ of Corti that are responsible for activation of afferent receptors in response to pressure waves reaching the basilar membrane through the transduction of sound. (wikipedia.org)
- Hair cells of the cristae activate afferent receptors in response to rotational acceleration. (wikipedia.org)
- Hair cells of the maculae in the utricle activate afferent receptors in response to linear acceleration while hair cells of the maculae in the saccule respond to vertically directed linear force. (wikipedia.org)
- TRPV1 receptors are found mainly in the nociceptive neurons of the peripheral nervous system, but they have also been described in many other tissues, including the central nervous system. (wikipedia.org)
- Often tumor cells secrete growth factors which activate receptors close to primary afferent neurons. (wikipedia.org)
- These receptors work in the same ways that most neurons do, by responding to the energy contained in selected stimuli and changing the permeability of their cell membranes to positively charged ions. (wikipedia.org)
- These stimuli are conveyed from upper motor neurons through the ventral horn of the spinal cord, and across synapses to be received by the sensory receptors of alpha motor neurons (large lower motor neurons) of the brainstem and spinal cord. (wikipedia.org)
- Upper motor neurons release a neurotransmitter, acetylcholine, from their axon terminal knobs, which are received by nicotinic receptors of the alpha motor neurons. (wikipedia.org)
- Neurons in the subfornical organ have receptors for many hormones that circulate in the blood but which do not cross the blood-brain barrier, including angiotensin, atrial natriuretic peptide, endothelin and relaxin. (wikipedia.org)
- External stimulation of the NMDA receptors is responsible for moving the neuron from the down state to the up state, while the stimulation of AMPA receptors allows the neuron to reach and surpass the threshold potential. (wikipedia.org)
- Eventually, the reactions cause the expression of new receptors on the cellular membranes of the postsynaptic neurons or increase the efficacy of the existing receptors through phosphorylation. (wikipedia.org)
- Ghrelin also plays an important role in regulating reward perception in dopamine neurons that link the ventral tegmental area to the nucleus accumbens (a site that plays a role in processing sexual desire, reward, and reinforcement, and in developing addictions) through its colocalized receptors and interaction with dopamine and acetylcholine. (wikipedia.org)
- Ghrelin and synthetic ghrelin mimetics (growth hormone secretagogues) increase body weight and fat mass by triggering receptors in the arcuate nucleus that include the orexigenic neuropeptide Y (NPY) and agouti-related protein (AgRP) neurons. (wikipedia.org)
- U When peptides that mimic the cytoplasmic tails of AMPA receptors are expressed in individual Xenopus neurons, trafficking of AMPA receptors to nascent synapses is minimized in those cells. (wikipedia.org)
- This is because without AMPA receptors, the neuron can't cause neighboring neurons to fire action potentials, therefore disallowing their synapses to strengthen. (wikipedia.org)
- Glutamate released from the upper motor neurons triggers depolarization in the lower motor neurons in the anterior grey column, which in turn causes an action potential to propagate the length of the axon to the neuromuscular junction where acetylcholine is released to carry the signal across the synaptic cleft to the postsynaptic receptors of the muscle cell membrane, signaling the muscle to contract. (wikipedia.org)
- It is due to the photo receptors sinking through the afferent nerves. (wikipedia.org)
- Sensory neurons also known as afferent neurons are neurons that convert a specific type of stimulus, via their receptors, into action potentials or graded potentials. (wikipedia.org)
- Different types of sensory neurons have different sensory receptors that respond to different kinds of stimuli. (wikipedia.org)
- These receptor neurons contain receptors, called olfactory receptors, that are activated by the odor molecules in the air. (wikipedia.org)
- Similarly to olfactory receptor neurons, taste receptors (gustatory receptors) in taste buds interact with chemicals in food to produce an action potential. (wikipedia.org)
- Upon activation, EC cells release serotonin to act upon serotonin receptors on ENS neurons. (wikipedia.org)
- 5-HT also activates a neural secretory response, whereby binding at 5-HT1P receptors on myenteric neurons triggers a signalling cascade in the submucosal plexus. (wikipedia.org)
- Sensory receptors that are spread throughout the body [skin, organs, muscles, etc.] send sensory input signals to the cortex via sensory afferent neurons. (wikipedia.org)
- For example, a touch stimulus creates a sensation in the brain only after the afferent neurons sense the stimuli and send the information about the stimuli. (reference.com)
- Somatic afferent neurons firing in the spinal cord can inhibit viscerosomatic neurons in the dorsal horn from responding to stimuli. (thefreedictionary.com)
- We conclude that information about tactile stimuli in timing of spikes in primary afferents, even if limited to the first spikes, surpasses that contained in firing rates and that these measures of afferents' responses might capture different aspects of the stimulus. (diva-portal.org)
- We examined several forms of mitogen-activated protein kinases (MAPKs) dynamics in primary afferent neurons and also in spinal cord neurons following noxious stimuli to normal tissue or using inflammatory pain model or neuropathic pain model. (nii.ac.jp)
- Double-labeling studies revealed that nodose neurons responded to 5-HT-dependent luminal stimuli contain mainly glutamate and substance P. Over the past year or so it has become clear that there are multiple possible excitatory inputs to a common vagal afferent route with synergistic interactions being common. (eurekaselect.com)
- Understanding how the brain processes sensory information is often complicated by the fact that neurons exhibit trial-to-trial variability in their responses to stimuli. (pnas.org)
- The dendrites receive stimuli from other nerves or from a receptor organ, such as the skin or ear, and transmit them through the neuron to the axon. (thefreedictionary.com)
- The dendrites of the sensory neurons are designed to receive stimuli from various parts of the body. (thefreedictionary.com)
- and (vii) with some exceptions, most neurons receiving ventral root inputs were excited best by mechanical and/or thermal noxious stimuli applied to the periphery. (utmb.edu)
- most neurons were sensitive to interaural time delays in pure tone and noise stimuli such that inhibition was nearly maximal when the stimuli were presented to the ears in-phase. (jneurosci.org)
- Neuronal survival is regulated in a complex environment in which neurons are exposed simultaneously to a variety of stimuli, including peptide neurotrophic factors and depolarization. (jneurosci.org)
- These are the neurons which respond to stimuli. (hubpages.com)
- Different types of tactile afferents respond to mechanical stimuli with different selectivity. (frontiersin.org)
- Rapidly adapting type 1 (RA1) afferents respond to stimuli that bump against the skin and convey information about motion across the skin ( Johansson and Westling, 1987 ). (frontiersin.org)
- At a given receptive-field location, LGN neurons, particularly cells in the parvocellular laminae, tended to prefer either radially oriented stimuli or stimuli oriented more horizontally than their polar axis. (cambridge.org)
- Distance chemoreceptors are integral to receiving stimuli as gases in the olfactory system through both olfactory receptor neurons and neurons in the vomeronasal organ . (wikipedia.org)
- What neurons are responsible for transmitting conducting Sensory stimuli from Peripheral Nervous System to the Central Nervous System? (brainscape.com)
- What portion of the Neuron receives stimuli or messages via chemoreceptors? (brainscape.com)
- Neurons here are responsive to tactile stimuli, visual stimuli, and auditory stimuli. (wikipedia.org)
- The Sur laboratory has also shown how neurons of the mature visual cortex alter their responses dynamically based on the configuration of visual stimuli in space and time. (wikipedia.org)
- Also, the threshold of HT channels was lowered in the presence of PGE2 (a compound that sensitizes neurons to mechanical stimuli and mechanical hyperalgesia) which further supports a role for HT channels in the transduction of mechanical stimuli into nociceptive neuronal signals. (wikipedia.org)
- Neurons become unusually sensitive and develop spontaneously pathological activity, abnormal excitability, and heightened sensitivity to chemical, thermal and mechanical stimuli. (wikipedia.org)
- As a consequence of spontaneous activity arising in the periphery, STT neurons develop increased background activity, enlarged receptive fields and increased responses to afferent impulses, including normally innocuous tactile stimuli. (wikipedia.org)
- Researchers believe that the ability of various somatosensory receptor neurons to respond to specific stimuli is a result of "combinational expression" of various ion channels in each specific neuronal class. (wikipedia.org)
- This process essentially works as a filter as the synapses of the neural network enhance certain signals and repress others, with simple stimuli receiving attention from lower-level neurons, and more complicated stimuli receiving attention from higher level neurons. (wikipedia.org)
- Stimuli from the precentral gyrus are transmitted from upper motor neurons and down the corticospinal tract, via axons to control skeletal (voluntary) muscles. (wikipedia.org)
- These sensory receptor cells are activated by different stimuli such as heat and pain, giving a functional name to the responding sensory neuron, such as a thermoreceptor which carries information about temperature changes. (wikipedia.org)
- Examples of this kind of gating have been found in visual cortical neurons and areas of the prefrontal cortex (PFC) in primates that may be responsible for suppressing irrelevant stimuli. (wikipedia.org)
- Sensory neurons respond to one particular type of stimuli such as touch, sound, or light and all other stimuli affecting the cells of the sensory organs, and converts it into an electrical signal via transduction, which is then sent to the spinal cord or brain. (wikipedia.org)
- The geometry of neurons often depends on the cell type and the history of received stimuli that is processed through the synapses. (wikipedia.org)
- the Aδ and C fibres are nociceptor afferents which respond to painful stimuli. (wikipedia.org)
- Interactions between these connections is thought to mediate the perception of painful stimuli: With no input, the inhibitory interneuron stops signals being sent to the brain from the projection neuron i.e. the gate is closed. (wikipedia.org)
- The magnocellular neurons are electrically excitable: In response to afferent stimuli from other neurons, they generate action potentials, which propagate down the axons. (wikipedia.org)
- Neurons within lamina V are mainly involved in processing sensory afferent stimuli from cutaneous, muscle and joint mechanical nociceptors as well as visceral nociceptors. (wikipedia.org)
- Crain, S.M. and Shen, K-F. (1990) Opioids can evoke direct receptor-mediated excitatory effects on sensory neurons. (springer.com)
- The aim of this study was to determine whether somatostatin (SS)-immunoreactive neurons of the rat fascia dentata are involved in specific excitatory circuitries that may result in their selective damage in models of epilepsy. (nih.gov)
- These observations demonstrate that SS-immunoreactive neurons in the hilar region are integrated in the main excitatory impulse flow of the hippocampal formation. (nih.gov)
- Bathing solutions containing low Ca2+ eliminated synaptic transmission in the slices but failed to block the excitatory effects of L-glutamate for the majority of the neurons tested. (jneurosci.org)
- In four of six neurons unresponsive to MTII, decreasing Ca 2+ e levels to 1.5 m m uncovered an excitatory effect of MTII on EPSC amplitude. (jneurosci.org)
- Here, we used intracellular recordings of LTTD neurons in isolated rattlesnake brains to decipher the spatio-temporal pattern of excitatory and inhibitory responses following electrical stimulation of single and multiple peripheral pit organ-innervating nerve branches. (biologists.org)
- The responses of individual neurons consisted of complex spike sequences that derived from spatially and temporally specific interactions between excitatory and inhibitory synaptic inputs from the same as well as from adjacent peripheral nerve terminal areas. (biologists.org)
- In the present study, CRF was found to increase the amplitude of field potentials recorded in the BLA following excitatory afferent stimulation, in vitro. (nih.gov)
- Taken together, our study reveals a crucial regulatory mechanism by PPTg excitatory inputs onto VTA non-DA neurons during appetitive Pavlovian conditioning. (drugabuse.gov)
- Eighty-seven percent of neurons tested received ongoing nicotinic cholinergic fast excitatory postsynaptic potentials (fEPSPs). (elsevier.com)
- In DLM neurons in vivo , HVC stimulation evoked rapid and precise excitatory responses, with an average latency of 17.8 ms (n = 12). (beds.ac.uk)
- Afferent fiber stimulation evokes a short excitatory response in pallidal cells, which is shaped by an inhibitory network in Area X. This response profile could play various roles in driving firing in DLM, either providing a strong inhibition allowing subsequent post-inhibitory rebound, or shortening rebound firing induced by a previous pause. (beds.ac.uk)
- Here we identify two genetically distinct, spatially segregated populations of excitatory neurons in the mouse BLA that participate in valence-specific behaviors and are connected through mutual inhibition. (nature.com)
- In adult vertebrates, sensory neurons innervating stretch-sensitive muscle spindles make monosynaptic excitatory connections with specific subsets of motoneurons in the spinal cord. (jneurosci.org)
- Ia afferents from one muscle make strong monosynaptic excitatory synapses with motoneurons supplying the same and synergistic muscles, but Ia afferents make few if any direct connections with motoneurons supplying antagonistic muscles. (jneurosci.org)
- Anatomical and physiological evidence, however, shows that low-frequency LSO neurons receive low-frequency inhibitory input from ipsilateral MNTB, which in turn receives excitatory input from the contralateral cochlear nucleus and low-frequency excitatory input from the ipsilateral cochlear nucleus. (jneurosci.org)
- ITDs are extracted by medial superior olive neurons in which ITD sensitivity results from the coincident arrival of excitatory inputs from the two ears [excitatory-excitatory (EE) binaural interaction], causing maximal responses when the ITD in the stimulus offsets differences in neural conduction times from the ears. (jneurosci.org)
- ILDs are extracted by lateral superior olive (LSO) neurons via a subtraction-like process resulting from inhibitory inputs from the contralateral and excitatory inputs from the ipsilateral ear [inhibitory-excitatory (IE) binaural interaction]. (jneurosci.org)
- Methods: Action potentials (APs) and excitatory post-synaptic currents (EPSCs) were investigated in BRNs/barosensitive neurons identified by conduction velocity (CV), capsaicin-conjugated with Iberiotoxin-sensitivity and fluorescent dye using intact nodose slice and brainstem slice in adult female rats. (elsevier.com)
- In this study, the authors find that DNA methyltransferases Dnmt1 and 3a have an active role in the maintenance of DNA methylation in postmitotic excitatory neurons. (nature.com)
- This means that HSD2 neurons probably release the excitatory transmitter glutamate onto their synaptic target neurons, as all Phox2b-expressing neurons in the NTS express the vescicular glutamate transporter VGlut2. (wikipedia.org)
- Deflection towards the longest hair results in depolarization of the hair cell, increased neurotransmitter release at the excitatory afferent synapse, and a higher rate of signal transduction. (wikipedia.org)
- Smaller neurons require a smaller amount of excitatory input to reach its threshold compared to larger neurons. (wikipedia.org)
- Whether it is turned on or off is dependent on the nature of the input signal (either excitatory or inhibitory) from the presynaptic neuron. (wikipedia.org)
- 2008 Sep;295(3):C679-91 Like Substance P [SP], Neurokinin A is present in excitatory neurons and secretory cells of the hypothalamic-pituitary-adrenal axis. (wikipedia.org)
- Of the afferent inputs to the supraoptic nucleus, most contain either the inhibitory neurotransmitter GABA or the excitatory neurotransmitter glutamate, but these transmitters often co-exist with various peptides. (wikipedia.org)
- The majority of SS-immunoreactive axon terminals form symmetric synapses with the granule cell dendrites in the outer molecular layer and also innervate deep hilar neurons. (nih.gov)
- These afferents innervate the large ventral horseshoe neuropil (HN) in the core of each ganglion. (uncg.edu)
- Furthermore, we discovered that some of the crayfish afferents innervate glomeruli within the HN. (uncg.edu)
- While their cell bodies are found in the central nervous system (CNS), α motor neurons are also considered part of the somatic nervous system -a branch of the peripheral nervous system (PNS)-because their axons extend into the periphery to innervate skeletal muscles . (wikipedia.org)
- Like other regions of the spinal cord, cells in this lamina are somatotopically organized, meaning that the position of neurons within the spinal cord is associated with what muscles they innervate. (wikipedia.org)
- Lesions of these neurons produce flaccid paralysis of the muscles they innervate. (thefreedictionary.com)
- Our results thus provide further evidence that unmyelinated primary afferents can be divided into peptide and non-peptide containing subpopulations and that these populations innervate distinct regions of laminae I and II. (wright.edu)
- Transganglionic transport of horseradish peroxidase (HRP) or horseradish peroxidase-wheat germ agglutinin conjugate (HRP-WGA) was used to map in detail the central projections of trigeminal primary afferent neurons that innervate the dental pulp organ of the rat. (elsevier.com)
- Recent studies utilizing electrophysiological, anatomical and gene expression techniques indicate a surprisingly diverse set of distinct afferent subclasses, which innervate all layers of the colon and rectum. (frontiersin.org)
- Extrinsic sensory afferents that innervate the colon and rectum are subdivided based on the location of their soma. (frontiersin.org)
- Cranial visceral afferents innervate second-order nucleus tractus solitarius (NTS) neurons via myelinated (A-type) and unmyelinated (C-type) axons in the solitary tract (ST). A- and C-type afferents often evoke reflexes with distinct performance differences, especially with regard to their frequency-dependent properties. (elsevier.com)
- Later, thalamic axons invade layer 4 where they innervate layer 4 neurons. (wikipedia.org)
- The main areas these neurons innervate are the caudal ventrolateral medulla (CVLM), the nucleus of the solitary tract (NTS), the lateral parabrachial area (LPb), the periaqueductal grey matter (PAG), and certain regions in the thalamus. (wikipedia.org)
- A single afferent nerve fibre branches to innervate up to 90 such endings. (wikipedia.org)
- The first has mixed sensory and motor nerves innervating swimmerets while the second has sensory and motor neurons that innervate the extensor muscles, while the third root contains only motor neuron projections that extend into the flexor muscles. (wikipedia.org)
- The term 'motor neuron' is usually restricted to the lower motor neurons, the efferent nerves that directly innervate muscles. (wikipedia.org)
- A single motor neuron may innervate many muscle fibres and a muscle fibre can undergo many action potentials in the time taken for a single muscle twitch. (wikipedia.org)
- There are seven major white matter motor tracts to be found in the spinal cord and are listed below: Lateral Corticospinal Tract Rubrospinal Tract Lateral Reticulospinal Tract Vestibulospinal tract Medial Reticulospinal Tract Tectospinal Tract Anterior Corticospinal Tract Lower motor neurons are those that originate in the spinal cord and directly or indirectly innervate effector targets. (wikipedia.org)
- These observations suggest that SS-immunoreactive neurons in the dentate hilar area may be driven directly by their perforant path synapses and via the granule cells which are known to receive a dense innervation from the entorhinal cortex. (nih.gov)
- The existence of GABA-like immunoreactivity in the synapses on the primary afferent axons and GABA- and glutamate immunoreactive synapses on the dorsal cell somatic membrane was shown using double postembedding immunogold cytochemistry. (unboundmedicine.com)
- These morphological findings suggest that control of the sensory information in the lamprey spinal cord is realized by means of presynaptic inhibition through the synapses on the primary afferent axons as well as directly through the synapses on the somata of the sensory neurons. (unboundmedicine.com)
- They transmit impulses to other neurons or cells by releasing neurotransmitters at synapses. (thefreedictionary.com)
- A motor neuron (actually an interneuron) found completely within the central nervous system that synapses with or regulates the actions of lower motor neurons in the spinal cord and cranial nerves. (thefreedictionary.com)
- Visceral efferent neurons form synapses with smooth muscle, cardiac muscle, and glands. (thefreedictionary.com)
- Taken together, our results demonstrate that AChE is dispensable for its proposed non-classical roles in muscle fiber formation and sensory neuron development, but is crucial for regulating the stability of neuromuscular synapses. (nih.gov)
- Each receptor cell synapses with several afferent sensory neurons, and each afferent neuron branches to several taste papillae, where each branch makes contact with many receptor cells. (britannica.com)
- Suprachiasmatic clock neurons modulate osmosensory synapses onto vasopressin neurons to facilitate osmoregulated vasopressin release, reports a study in this issue. (nature.com)
- In the medulla, at the dorsal column nuclei, the first order neuron synapses with the second order neuron, which then decussates (crosses over to the other side of the Central Nervous System) into the medial lemniscus. (wikipedia.org)
- In sensory transduction, the afferent nerves transmit through a series of synapses in the central nervous system, first in the spinal cord or trigeminal nucleus, depending on the dermatomic area concerned. (wikipedia.org)
- The striatal afferents contribute more than 90% of synapses. (wikipedia.org)
- typically a magnocellular neuron receives about 10,000 synapses from afferent neurons. (wikipedia.org)
- Bipolar neurons present a good model for how ribbon synapses function. (wikipedia.org)
- Ribbon synapses enable neurons to transmit light signals over a dynamic range of several orders of magnitude in intensity. (wikipedia.org)
- To accomplish this level of performance, the sensory neurons of the eye maintain large pools of fast releasable vesicles that are equipped with ribbon synapses. (wikipedia.org)
- The other branch innervates the inhibitory interneuron, which in turn innervates the alpha motor neuron that synapses onto the opposing muscle. (wikipedia.org)
- The dendrites of the two constituting genera receive synapses from a variety of afferent axons. (wikipedia.org)
- Its synapses are located close to the soma of the thalamic neuron, often forming the center of glomerular complexes. (wikipedia.org)
- The VPM contains synapses between second and third order neurons from the anterior (ventral) trigeminothalamic tract and posterior (dorsal) trigeminothalamic tract. (wikipedia.org)
- citation needed] The interface through which neurons interact with their neighbors usually consists of several axon terminals connected via synapses to dendrites on other neurons. (wikipedia.org)
- The basic kinds of connections between neurons are chemical synapses and electrical gap junctions. (wikipedia.org)
- On the electrophysiological level, there are various phenomena which alter the response characteristics of individual synapses (called synaptic plasticity) and individual neurons (intrinsic plasticity). (wikipedia.org)
- These signals between neurons occur via specialized connections called synapses. (wikipedia.org)
- At the majority of synapses, signals are sent from the axon of one neuron to a dendrite of another. (wikipedia.org)
- There are, however, many exceptions to these rules: for example, neurons can lack dendrites, or have no axon, and synapses can connect an axon to another axon or a dendrite to another dendrite. (wikipedia.org)
- The features that define a neuron are electrical excitability and the presence of synapses, which are complex membrane junctions that transmit signals to other cells. (wikipedia.org)
- In the normal cell, some of these branches would form synapses, which is not the case in the neurons expressing the peptide. (wikipedia.org)
- For example, during lactation there are large changes in the size and shape of the oxytocin neurons, in the numbers and types of synapses that these neurons receive, and in the structural relationships between neurons and glial cells in the nucleus. (wikipedia.org)
- The elegantly coiled, mechanically tuned cochlear duct and functional differentiation between inner hair cells (IHCs) and outer hair cells (OHCs), afferent and efferent neuronal connections are among the features that enable the widest acoustic frequency range and most complex vocalizations among vertebrate species. (pnas.org)
- To determine the specific VTA neuronal targets of VP afferents and their sensitivity to mu opioid receptor agonists, we virally expressed channel rhodopsin (ChR2) in rat VP neurons and optogenetically activated their terminals in the VTA. (jneurosci.org)
- Trigeminal afferents transmit information about changing temperature patterns as neuronal spike discharge in a topographic manner to the hindbrain nucleus of the lateral descending trigeminal tract (LTTD). (biologists.org)
- In all cases ( n = 6 neurons in 6 individual rats), dizocilpine inhibited the effects of CCK, PBG, and PE on RVLM presympathetic neuronal discharge. (physiology.org)
- While it seems firmly established that the cardiovascular effects of CCK are dependent on vagal afferent mechanisms, it would seem prudent to seek support for this concept at the single neuronal level. (physiology.org)
- It is suggested that during movements of the hindleg, activation of sciatic sensory fibres leads to re-patterning of neuronal activity in RVLM neurons via inhibition of visceral sensory inputs. (gla.ac.uk)
- Sciatico-vagal inhibition is likely to affect the activity of those RVLM neurons that modulate higher neuronal activities via ascending projections. (gla.ac.uk)
- As afferents do not project directly into the lumen, their activation depends on an intermediary step, i.e. neuronal activation by a secondary substance released from within the mucosal epithelium. (eurekaselect.com)
- We used expression of c-Fos protein as an indicator of neuronal activity to identify dopaminergic neurons that are active during wakefulness but not during sleep. (jneurosci.org)
- Vagal afferents are an important neuronal component of the gut-brain axis allowing bottom-up information flow from the viscera to the CNS. (jneurosci.org)
- Partial nerve injury also decreases dorsal horn levels of the GABA synthesizing enzyme glutamic acid decarboxylase (GAD) 65 kDa ipsilateral to the injury and induces neuronal apoptosis, detected by terminal deoxynucleotidyl transferase-mediated biotinylated UTP nick end labeling staining in identified neurons. (jneurosci.org)
- These are non-neuronal cells that maintain homeostasis, produce myelin as mentioned before and importantly provides support and protection for the neurons in the brain and nervous system. (hubpages.com)
- Graziano has made contributions in three areas of neuroscience: how neurons in the primate brain encode peripersonal space, how the motor cortex controls complex movement, and the possible neuronal basis of consciousness. (wikipedia.org)
- The neurons that encode peripersonal space may also provide a neuronal basis for the psychological phenomenon of personal space. (wikipedia.org)
- Just outside the spinal cord, thousands of afferent neuronal cell bodies are aggregated in a swelling in the dorsal root known as the dorsal root ganglion. (wikipedia.org)
- With the loss of neuronal input (deafferentation) the STT neurons begin to fire spontaneously, a phenomenon designated "deafferentation hypersensitivity. (wikipedia.org)
- The presence of nuclear c-Fos implies recent, elevated neuronal activity, and c-Fos disappears after neurons become quiescent. (wikipedia.org)
- Axons directly facilitate intercellular communication projecting from the neuronal cell body to other neurons, local muscle tissue, glands and arterioles. (wikipedia.org)
- The stimulus, therefore, is diverted to the effector organ without entering the neuronal cell body and therefore indicates that the axon reflex is not a true reflex where afferent impulses pass through the central nervous system before stimulating efferent neurons. (wikipedia.org)
- Langley concluded that the primary neuronal stimulation did not end after the first synapse but rather was involved in branching connections to multiple neurons causing cat hair in surrounding areas to rise. (wikipedia.org)
- Medium spiny projection neurons comprise 95% of the total neuronal population of the human striatum. (wikipedia.org)
- The constituting neurons belong to two different neuronal genera. (wikipedia.org)
- Pretectal nuclei: From the neuronal cell bodies in some of the pretectal nuclei, axons synapse on (connect to) neurons in the Edinger-Westphal nucleus. (wikipedia.org)
- Neurons are sometimes called nerve cells, though this term is potentially misleading since many neurons do not form nerves, and nerves also include non-neuronal Schwann cells that coat the axons in myelin. (wikipedia.org)
- The pathophysiology of the condition results from neuronal plasticity associated with bladder afferents and motor neurons innervating the external urethral sphincter. (wikipedia.org)
- For all encoding schemes, afferents terminating close to the stimulation site tended to convey more information about surface curvature than more remote afferents that tended to convey more information about force direction. (diva-portal.org)
- When EPSCs were evoked by electrical stimulation of the tractus solitarius in Krebs' solution with 2.4 m m Ca 2+ e , αMSH and MTII increased the amplitude in six of the 28 neurons tested, decreased amplitude in 14 with no effect in the remaining eight neurons. (jneurosci.org)
- Conditioning stimulation of the contralateral sciatic nerve (2 V) led to a time-dependent inhibition of responses to vagal stimulation (100 µA) in each RVLM neuron that received convergent sciatic and vagal sensory inputs (n = 50). (gla.ac.uk)
- None of these neurons had direct spinal projections, and only 8% of them exhibited a visible response to stimulation of the aortic depressor nerve. (gla.ac.uk)
- In the present study, we used single-unit extracellular recording techniques to examine the effects of stimulation of cardiac sympathetic afferents on baro- or chemosensitive neurons in the nucleus tractus solitarius (NTS) in anesthetized rats. (nebraska.edu)
- The L7 ventral root was cut near the spinal cord and the distal stump was stimulated while making a systematic search for neurons in the entire gray matter of the ipsilateral spinal cord that responded to the stimulation. (utmb.edu)
- We recorded the extracellular activity of i) Area X pallidal neurons and ii) DLM neurons in response to electrical stimulation of Area X afferent structures, namely HVC (used as a proper name) and the lateral magnocellular nucleus of the anterior nidopallium (LMAN). (beds.ac.uk)
- In vivo , almost all pallidal neurons of Area X displayed a rapid excitation in response to stimulation in either HVC (n = 48) or LMAN (n = 20). (beds.ac.uk)
- Diagram of disynaptic and trisynaptic pathways between group II muscle afferents and contralateral motoneurons and the medullary stimulation sites. (jneurosci.org)
- Yang F, Chung CY, Wacnik PW, Carteret AF, McKelvy AD , Meyer RA, Raja SN, Guan Y. (2011) Electrical stimulation at distinct peripheral sites in spinal nerve injured rats leads to different afferent activation profiles. (sc.edu)
- It comprises physiologically distinct cell types that process information in fundamentally different ways: tonic neurons fire repetitively during stimulation and display prolonged EPSPs, suggesting operation as integrators, whereas single-spike neurons act like coincidence detectors. (jneurosci.org)
- Instead, tonic neurons were found to express a persistent sodium current, I Na,P , that amplified and prolonged depolarization in response to brief stimulation. (jneurosci.org)
- Electrical stimulation of these multisensory neurons almost always evoked a complex, coordinated movement that resembled a flinching, blocking, or protecting action. (wikipedia.org)
- These cells are neuroendocrine neurons, are electrically excitable, and generate action potentials in response to afferent stimulation. (wikipedia.org)
- In addition, 5-HT3 receptor-mediated afferent vagus stimulation in the gut due to gastroenteritis is a cause of vomiting. (wikipedia.org)
- The observation that subfornical neurons are perceptive of a wide range of circulating energy balance signals and that electrical stimulation of the SFO in rats resulted in food intake supports the SFO's importance in energy homeostasis. (wikipedia.org)
- Efferent stimulation of the spindle by gamma motor neurons contracts the myofibrils, tautening the central region of spindle -- which maintains its sensitivity to gamma motoneuron stimulation. (wikipedia.org)
- In the pathway between the PFC and the hippocampus, stimulation of mediodorsal thalamic neurons, as well as stimulation of ventral tegmental area neurons inhibited PFC neuron firing. (wikipedia.org)
- Stretch-activated ion channels are located on these mechanoreceptor cells and serve to lower the action potential threshold, thus making the afferent nerves more sensitive to stimulation. (wikipedia.org)
- Stimulation of large tactile afferents leads to somatosensory input. (wikipedia.org)
- Nociception occurs if there is greater stimulation of the smaller pain afferents. (wikipedia.org)
- The theory shows that rubbing a painful site leads to stimulation of somatosensory input to projector neurons, which reduces the intensity of pain perceived. (wikipedia.org)
- TRPV1 is an ion channel in the plasma membrane of sensory neurons and stimulation by resiniferatoxin causes this ion channel to become permeable to cations, especially calcium. (wikipedia.org)
- Some sensory neurons can be activated by stimulation with an external object such as a parasite on the body surface. (wikipedia.org)
- To determine the functional significance of this ganglionic framework, we backfilled the following types of neurons with cobalt chloride: sensory hair afferents, slow and fast extensor motor neurons, the segmental stretch receptor neurons, and their inhibitory accessory cells. (uncg.edu)
- There are several types of neurons that are classified by the location of where they transmit information. (hubpages.com)
- The pathway consists of three types of neurons: first, second, and third order neurons. (wikipedia.org)
- These signals are refined and controlled by the interactions with other types of neurons in the retina. (wikipedia.org)
- Since there is a broad range of functions performed by different types of neurons in diverse parts of the nervous system, there is a wide variety in the size, shape, and electrochemical properties of neurons. (wikipedia.org)
- Terminology is just terminology, so "rules" are often made to be broken in biology: yes, an axon typically carries information away from the soma, but that's not the case here for neurons where the information sort of bypasses the soma. (stackexchange.com)
- A neuron consists of a cell body (perikaryon) and its processes, an axon and one or more dendrites. (thefreedictionary.com)
- A neuron whose axon crosses to the opposite side of the brain or spinal cord. (thefreedictionary.com)
- A neuron whose axon carries motor impulses away from the brain or spinal cord. (thefreedictionary.com)
- A neuron with one axon and many dendrites. (thefreedictionary.com)
- A neuron of the autonomic nervous system whose cell body lies in an autonomic ganglion and whose axon terminates in a visceral effector (smooth or cardiac muscle or glands). (thefreedictionary.com)
- A neuron of the autonomic nervous system whose cell body lies in the central nervous system and whose axon terminates in a peripheral ganglion, synapsing with postganglionic neurons. (thefreedictionary.com)
- The axon conducts the impulses to the dendrite of another neuron or to an effector organ that is thereby stimulated to action. (thefreedictionary.com)
- that is, there is no direct contact between the axon of one neuron and the dendrites of another. (thefreedictionary.com)
- The cholinergic nerves ( parasympathetic nervous system ) liberate at their axon endings a substance called acetylcholine , which acts as a stimulant to the dendrites of adjacent neurons. (thefreedictionary.com)
- The synapse may involve one neuron in chemical contact with many adjacent neurons, or it may involve the axon terminals of one neuron and the dendrites of a succeeding neuron in a nerve pathway. (thefreedictionary.com)
- What portion of the Neuron carries nerve impulses away from the soma to axon terminal? (brainscape.com)
- What portion of the Neuron is a phospholipid membrane that surrounds, protects, electrically insulates the axon, and is a signal amplifier? (brainscape.com)
- What are the gaps in the myelin sheath, where the action potential occurs during conduction along the axon of a Neuron called? (brainscape.com)
- Afferent neurons are pseudounipolar neurons that have a single long axon with a short central and a long peripheral branch. (wikipedia.org)
- The majority of these are unipolar neurons in that they have a single axon leaving the cell body and is sent towards the sensory organ. (wikipedia.org)
- Magnocellular neurosecretory cells in rats (where these neurons have been most extensively studied) in general have a single long varicose axon, which projects to the posterior pituitary. (wikipedia.org)
- These neurons are of the pseudo-unipolar type, meaning they have an axon with two branches that act as a single axon, often referred to as a distal process and a proximal process. (wikipedia.org)
- Soma-the cell body of the neuron Axon: which relays information from the soma. (wikipedia.org)
- In a neuron, the dendrite receives information from another neuron's axon at the synapse, and the axon sends information to the next neuron's dendrites, even though the dendrite may be covered with myelin. (wikipedia.org)
- The impulse is limited to a single bifurcated axon, or a neuron whose axon branches into two divisions and does not cause a general response to surrounding tissue. (wikipedia.org)
- The axon reflex results in a localized response to only the locally innervated cells of the single neuron where the signal originated. (wikipedia.org)
- The axon reflex pathway does not include an integration center or synapse that relays communication between neurons in the spinal cord reflex. (wikipedia.org)
- These have short and thin dendrites and short axon(s) and thus belong to local circuitry neurons. (wikipedia.org)
- When activated, the gatekeeper neuron alters the polarity of the presynaptic axon to either open or close the gate. (wikipedia.org)
- If this neuron depolarizes the presynaptic axon, it allows the signal to be transmitted. (wikipedia.org)
- If the sum of the input signals into one neuron surpasses a certain threshold, the neuron sends an action potential (AP) at the axon hillock and transmits this electrical signal along the axon. (wikipedia.org)
- If the depolarization of the neuron at the axon goes above threshold an action potential will occur that travels down the axon to the terminal endings to transmit a signal to other neurons. (wikipedia.org)
- A typical neuron consists of a cell body (soma), dendrites, and an axon. (wikipedia.org)
- Most neurons receive signals via the dendrites and send out signals down the axon. (wikipedia.org)
- The cell body of a neuron frequently gives rise to multiple dendrites, but never to more than one axon, although the axon may branch hundreds of times before it terminates. (wikipedia.org)
- A typical neuron is divided into three parts: the soma or cell body, dendrites, and axon. (wikipedia.org)
- In the peripheral nervous system, an efferent nerve fiber is the axon of a motor neuron. (wikipedia.org)
- The cell body of the motor neuron is connected to a single, long axon and several shorter dendrites projecting out of the cell body itself. (wikipedia.org)
- Each neuron in the nucleus has one long axon that projects to the posterior pituitary gland, where it gives rise to about 10,000 neurosecretory nerve terminals. (wikipedia.org)
- A motor neuron (or motoneuron) is a neuron whose cell body is located in the motor cortex, brainstem or the spinal cord, and whose axon (fiber) projects to the spinal cord or outside of the spinal cord to directly or indirectly control effector organs, mainly muscles and glands. (wikipedia.org)
- Our study demonstrates that innate anxiety and learned fear are both subjected to visceral modulation through abdominal vagal afferents, possibly via changing limbic neurotransmitter systems. (jneurosci.org)
- Most of the neurons that project out of the pars reticulata are inhibitory GABAergic neurons (i.e., these neurons release GABA, which is an inhibitory neurotransmitter). (wikipedia.org)
- The neurons of the pars reticulata produce the neurotransmitter gamma-aminobutyric acid (GABA). (wikipedia.org)
- When the movement is towards the tallest stereocilia, the K+ cation channels open allowing K+ to flow into cell and the resulting depolarization causes the Ca++ channels to open, thus releasing its neurotransmitter into the afferent auditory nerve. (wikipedia.org)
- EC cells modulate neuron signalling in the enteric nervous system (ENS) via the secretion of the neurotransmitter serotonin and other peptides. (wikipedia.org)
- It is an active excitotoxic process when a neuron is overstimulated by a neurotransmitter (most commonly glutamate) causing the dysfunction of that neuron (either damaging it or killing it) which drives neighboring neurons into metabolic deficit, resulting in rapid, widespread loss of neurons. (wikipedia.org)
- GABAergic neurons in the ventral pallidum (VP) provide a major input to VTA neurons. (jneurosci.org)
- This includes the orbitofrontal cortex (OFC) and anterior cingulate cortex (ACC), the ventral striatum (VS), the ventral pallidum (VP), and the midbrain dopamine (DA) neurons. (nih.gov)
- Lamina IX is located predominantly in the medial aspect of the ventral horn, although there is some contribution to lamina IX from a collection of motor neurons located more laterally. (wikipedia.org)
- A peripheral motor neuron that originates in the ventral horns of the gray matter of the spinal cord and terminates in skeletal muscles. (thefreedictionary.com)
- Spinal neurons receiving ventral root afferent inputs were investigated in anesthetized and paralyzed cats. (utmb.edu)
- The questions to be answered included the proportion and distribution of spinal neurons receiving ventral root afferent inputs and their peripheral input characteristics. (utmb.edu)
- PACAP neurons in the ventral premammillary nucleus regulate reproductive function in the female mouse. (nih.gov)
- Another mnemonic device used for remembering afferent and efferent (in terms of the spinal cord, with its dorsal/ventral organization) is SAME DAVE. (wikipedia.org)
- Sensory Afferent Motor Efferent, Dorsal Afferent Ventral Efferent. (wikipedia.org)
- The myenteric plexus originates in the medulla oblongata as a collection of neurons from the ventral part of the brain stem. (wikipedia.org)
- The medioposterior ensemble, in most of its volume does not receive subcortical afferents and abundant afferences from the "associative" cortex but in some, essentially ventral parts, in fact receives subcortical afferences, such as tectal, spinothalamic or amygdalar. (wikipedia.org)
- The axons of motor neurons begin to appear in the fourth week of development from the ventral region of the ventral-dorsal axis (the basal plate). (wikipedia.org)
- Efferent neurons carry nerve impulses from the central nervous system to the muscles and glands. (reference.com)
- A neuron that conducts sensory impulses toward the brain or spinal cord. (thefreedictionary.com)
- Neurons function in the initiation and conduction of impulses. (thefreedictionary.com)
- A neuron that mediates impulses between a sensory and a motor neuron. (thefreedictionary.com)
- 2. A neuron of the retina that receives impulses from the rods and cones and transmits them to a ganglion neuron. (thefreedictionary.com)
- A neuron of the retina that receives impulses from bipolar neurons. (thefreedictionary.com)
- A neuron that carries impulses from the central nervous system either to muscle tissue to stimulate contraction or to glandular tissue to stimulate secretion. (thefreedictionary.com)
- A motor neuron that transmits impulses to skeletal muscle. (thefreedictionary.com)
- The Free Dictionary explains that an association neuron is a neuron found in the brain and spinal cord that conducts impulses between neurons. (reference.com)
- These effects are triggered by nervous impulses that are passed along the neurons from the receptor that first received the stimulus. (reference.com)
- Those that carry impulses in the opposite direction, away from the brain and other nerve centers to muscles, are called efferent neurons, motor neurons, or motoneurons . (thefreedictionary.com)
- Another type, the interneuron , found in the brain and spinal cord, conducts impulses from afferent to efferent neurons. (thefreedictionary.com)
- A sensory neuron transmits impulses from a receptor, such as those in the eye or ear, to a more central location in the nervous system, such as the spinal cord or brain. (britannica.com)
- Sensory cells carry afferent impulses to a central interneuron, which makes contact with a motor neuron. (britannica.com)
- The motor neuron carries efferent impulses to the effector, which produces the response. (britannica.com)
- These impulses are transmitted to the brain through afferent neurons . (wikipedia.org)
- When the central nervous system sends a message to the agonist muscle (muscle causing movement) to contract, the tension in the antagonist muscle (muscle opposing movement) is inhibited by impulses from motor neurons, and thus must simultaneously relax. (wikipedia.org)
- A nerve conveys information in the form of electrochemical impulses (as nerve impulses known as action potentials) carried by the individual neurons that make up the nerve. (wikipedia.org)
- These impulses are extremely fast, with some myelinated neurons conducting at speeds up to 120 m/s. (wikipedia.org)
- The impulses travel from one neuron to another by crossing a synapse, the message is converted from electrical to chemical and then back to electrical. (wikipedia.org)
- These stimulants are transduced into electrical activity in the olfactory neurons, which then transmit these impulses to the olfactory bulb and from there to the rest of the central nervous system via the olfactory tract. (wikipedia.org)
- The peripheral nervous system consists of the sensory and motor neurons. (reference.com)
- Here, we report that peripheral nerve injury increases expression of the DNA methyltransferase DNMT3a in the injured DRG neurons via the activation of the transcription factor octamer transcription factor 1. (nature.com)
- We report here that the de novo methyltransferase DNMT3a, but not DNMT3b, is significantly increased in the injured DRG neurons after peripheral nerve injury. (nature.com)
- This prevents the peripheral afferent neurons transmitting nociceptive pain signals. (thefreedictionary.com)
- Spinal afferents, in addition, can initiate protective tissue reactions at the site of assault through release of calcitonin gene-related peptide (CGRP) from their peripheral endings. (ovid.com)
- Furthermore, the contribution of JNK activation in sensory neurons to pain is unknown, although peripheral axotomy has been shown to induce JNK/SAPK activation in DRG neurons ( Kenney and Kocsis, 1998 ). (jneurosci.org)
- To determine in aging mice the proportion, morphology and neurochemical characteristics of trigeminal ganglion cold primary sensory neurons and of their cold peripheral axons innervating the cornea, and the relationship of morphological changes with basal tearing rate. (arvojournals.org)
- Changes in the in morphological and neurochemical properties of corneal cold sensory neurons and their peripheral axons may be associated with the disturbances in basal tearing rate observed in mice with aging. (arvojournals.org)
- We now report the existence of a specific type of peripheral sensory neuron that monitors the fluid level of the ocular surface and display properties consistent with their role in the modulation of basal tearing. (arvojournals.org)
- Mechanosensitivity of peripheral afferents of the saphenous nerve as well as of spinal wide dynamic range (WDR) and nociceptive-specific (NS) neurons were measured after systemic or spinal application of J-2156. (ovid.com)
- Mechanosensitivity of peripheral afferents and spinal neurons was significantly reduced by J-2156. (ovid.com)
- A neuron whose process constitutes a part of the peripheral nervous system (cranial, spinal, or autonomic nerves). (thefreedictionary.com)
- Glucose regulates GI functions via actions at multiple sites of action, from modulating the activity of enteric neurons, endocrine cells, and glucose transporters within the intestine, to regulating the activity and responsiveness of the peripheral terminals, cell bodies and central terminals of vagal sensory neurons, to modifying both the activity and synaptic responsiveness of central brainstem neurons. (frontiersin.org)
- To clarify whether inhibitory transmission in the superficial dorsal horn of the spinal cord is reduced after peripheral nerve injury, we have studied synaptic transmission in lamina II neurons of an isolated adult rat spinal cord slice preparation after complete sciatic nerve transection (SNT), chronic constriction injury (CCI), or spared nerve injury (SNI). (jneurosci.org)
- Afferent neurons' somas are located in the ganglia of the peripheral nervous system, and the axons of these cells travel from ganglion to ganglion and lead back to the spinal cord. (wikipedia.org)
- Non-spiking neurons are neurons that are located in the central and peripheral nervous systems and function as intermediary relays for sensory-motor neurons. (wikipedia.org)
- In the peripheral nervous system, afferents refer to the axons that relay sensory information into the central nervous system (i.e. the brain and the spinal cord). (wikipedia.org)
- Peripheral nerve injury induces glia to release proinflammatory cytokines and glutamate-which, in turn influence neurons. (wikipedia.org)
- Experiments with conventional tracers and immunofluorescence staining have demonstrated peripheral viscerosensory input from the vagus nerve, input from nearby neurons in the NTS and area postrema, and descending input from the medial central nucleus of the amygdala (CeA) and paraventricular hypothalamic nucleus (PVN). (wikipedia.org)
- Neurons are the primary components of the central nervous system, which includes the brain and spinal cord, and of the peripheral nervous system, which comprises the autonomic nervous system and the somatic nervous system. (wikipedia.org)
- In vertebrates, the majority of neurons belong to the central nervous system, but some reside in peripheral ganglia, and many sensory neurons are situated in sensory organs such as the retina and cochlea. (wikipedia.org)
- Experiments looking at the WDR neurons in animals have shown that a strong tactile stimulus in the peripheral inhibitory field could reduce the response to a painful stimulus to the same extent as a weak tactile stimulus closer to the centre of the receptive field. (wikipedia.org)
- Play media The scratch reflex is a response to activation of sensory neurons whose peripheral terminals are located on the surface of the body. (wikipedia.org)
- In addition, afferent neurons may synapse with other afferent nerve cells within the central nervous system. (thefreedictionary.com)
- The point at which an impulse is transmitted from one neuron to another is called a synapse. (thefreedictionary.com)
- synapse, or connect, with afferent sensory neurons, nerve cells that conduct information to the brain. (britannica.com)
- This enables the cell to exocytose hundreds of vesicles per second, greatly exceeding the rate of neurons without the specialized ribbon synapse. (wikipedia.org)
- This part of the spindle is innervated by type Ia sensory fiber that go on to synapse with alpha motor neurons, completing the gamma-loop. (wikipedia.org)
- It includes a sort of gatekeeper neuron, which has the ability to influence transmission of information to selected targets independently of the parts of the synapse upon which it exerts its action (see also neuromodulation). (wikipedia.org)
- In effect, the gatekeeper neuron acts as the transistor of a gated synapse by modulating the transmission of the signal between the pre-synaptic and post-synaptic neurons. (wikipedia.org)
- The gatekeeper neuron, therefore, serves as an external switch to the gate at the synapse of two other neurons. (wikipedia.org)
- They assert the structure of the neuron is able to determine its function by dictating synapse formation. (wikipedia.org)
- Afferent: Nociception detected in the S1 dermatome and travels up the tibial nerve to the sciatic nerve to roots of L5,S1 and synapse in the anterior horn to elicit the motor response. (wikipedia.org)
- Recurrent oscillations in thalamocortical circuits also provide large-scale regulatory feedback inputs to the thalamus via GABAergic neurons that synapse in the TRN. (wikipedia.org)
- These results show that MC4R signaling leads mainly to presynaptic modulation of glutamatergic synaptic transmission and suggest that melanocortinergic-induced decrease of food intake may occur via enhancement of vagal afferent satiation signals from the gastrointestinal tract. (jneurosci.org)
- NTS neurons have reciprocal connections with higher CNS centers and integrate signals related to cognitive, emotional, and rewarding influences. (jneurosci.org)
- The S and T afferent neurons of the TCMRO convey signals to the CNS solely by means of graded changes in membrane potential. (semanticscholar.org)
- This review addresses the role for both cholecytokinin (CCK) and serotonin (5-HT) released from enteroendocrine cells and acting as paracrine agents on the terminals of vagal afferents in responses to a number of luminal signals. (eurekaselect.com)
- Afferent neurons carry signals to the brain and spinal cord as sensory data, and efferent neurons send signals from the brain to the muscles, glands and or. (reference.com)
- However, because the system relies on two-way communication between neurons that need to fire in the correct sequence, conditions and chemicals that inhibit these signals can interfere with this process. (reference.com)
- which contribute to their integration of this vast volume of sensory afferent information with metabolic and hormonal signals as well as neural inputs from brainstem and other CNS nuclei involved the regulation of autonomic functions. (frontiersin.org)
- Our study reveals that ribbon enlargement results in increased ribbon-localized calcium signals, yet reduces afferent spontaneous activity and disrupts the timing of stimulus onset, a distinct aspect of auditory and vestibular encoding. (jneurosci.org)
- Acoustic signals are relayed from the ear to the brain via spiral ganglion neurons (SGNs) that receive auditory information from the cochlear inner hair cells (IHCs) and transmit that information to the cochlear nucleus of the brainstem. (jneurosci.org)
- In mammals, cochlear inner hair cells (IHCs) convert pressure waves into electrochemical signals that are relayed to the brain via type I spiral ganglion neurons (SGNs). (jneurosci.org)
- These data add further weight to theories emphasizing an important role of afferent visceral signals in the regulation of emotional behavior. (jneurosci.org)
- primary site for receiving signals from other neurons. (studystack.com)
- The neurons that transmit pain and other sensory information do so using electrical signals. (elifesciences.org)
- What neurons are responsible for transmitting signals from the Central Nervous System to the muscles and glands? (brainscape.com)
- PNS efferents are the axons of spinal cord motor neurons that carry motor-movement signals out of the spine to the muscles. (wikipedia.org)
- There are an abundance of neurons that propagate signals via action potentials and the mechanics of this particular kind of transmission is well understood[citation needed]. (wikipedia.org)
- A spinal interneuron, found in the spinal cord, relays signals between (afferent) sensory neurons, and (efferent) motor neurons. (wikipedia.org)
- The loss of afferent signals induces functional changes in dorsal horn neurons. (wikipedia.org)
- When particular signals are received by the animal, the superior-ranking neurons determine which signals are important enough to preserve and which signals are insignificant and can be ignored. (wikipedia.org)
- The Ia afferent signals are transmitted monosynaptically to many alpha motor neurons of the receptor-bearing muscle. (wikipedia.org)
- The basic route of nerve signals within the efferent somatic nervous system involves a sequence that begins in the upper cell bodies of motor neurons (upper motor neurons) within the precentral gyrus (which approximates the primary motor cortex). (wikipedia.org)
- Neurons are the excitable cells that process and transmit these reflex signals through their axons, dendrites, and cell bodies. (wikipedia.org)
- Other types include mechanoreceptors, chemoreceptors, and nociceptors and they send signals along a sensory nerve to the spinal cord where they may be processed by other sensory neurons and then relayed to the brain for further processing. (wikipedia.org)
- The AVCN consists of spherical bushy cells and globular bushy cells and can also transmit signals to the medial nucleus of the trapezoid body (MNTB), whose neuron projects to the MSO. (wikipedia.org)
- When the central nervous system sends out signals to alpha neurons to fire, signals are also sent to gamma motor neurons to do the same. (wikipedia.org)
- Gamma motor neurons are the efferent (sending signals away from the central nervous system) part of the fusimotor system, whereas muscle spindles are the afferent part, as they send signals relaying information from muscles toward the spinal cord and brain. (wikipedia.org)
- A neuron, also known as a neurone and nerve cell, is an electrically excitable cell that receives, processes, and transmits information through electrical and chemical signals. (wikipedia.org)
- Motor neurons receive signals from the brain and spinal cord to cause everything from muscle contractions and affect glandular outputs. (wikipedia.org)
- Gastric-brain communication is an essential part of energy homeostasis, and several communication pathways are probable, including the gastric intracellular mTOR/S6K1 pathway mediating the interaction among ghrelin, nesfatin and endocannabinoid gastric systems, and both afferent and efferent vagal signals. (wikipedia.org)
- Golgi I neurons have long axons that can move signals over long distances, such as in Purkinje cells, whereas Golgi II neurons generally have shorter axons, such as granule cells, or are anoxonic. (wikipedia.org)
- The inhibitory interneuron and projection neuron are both activated, but the inhibitory interneuron stops signals travelling to the brain via the projection neuron i.e. the gate is closed. (wikipedia.org)
- The interneuron becomes inactivated, so that the projection neuron can send signals to the brain leading to pain perception i.e. the gate is open. (wikipedia.org)
- The influx of cations causes the neuron to depolarize, transmitting signals similar to those that would be transmitted if the innervated tissue were being burned or damaged. (wikipedia.org)
- Nerves are categorized into three groups based on the direction that signals are conducted: Afferent nerves conduct signals from sensory neurons to the central nervous system, for example from the mechanoreceptors in skin. (wikipedia.org)
- Efferent nerves conduct signals from the central nervous system along motor neurons to their target muscles and glands. (wikipedia.org)
- An efferent nerve fiber conducts signals from a motor neuron in the central nervous system to muscles. (wikipedia.org)
- There are 13 Hox transcription factors and- along with the signals- these determine whether a motor neuron will be more rostral or caudal in character. (wikipedia.org)
- While these tracts exist for both efferent and afferent nerves, efferent nerves will carry signals down the spinal cord toward their effector target. (wikipedia.org)
- Alpha motor neurons are derived from the basal plate (basal lamina) of the developing embryo . (wikipedia.org)
- A motor neuron pool contains the cell bodies of all the alpha motor neurons involved in contracting a single muscle. (wikipedia.org)
- Alpha motor neurons are located in lamina IX according to the Rexed lamina system . (wikipedia.org)
- Alpha motor neurons are located in a specific region of the spinal cord's gray matter. (wikipedia.org)
- They have smaller cell bodies than alpha motor neurons and do not receive proprioceptive input. (wikipedia.org)
- In turn, alpha motor neurons relay the stimulus. (wikipedia.org)
- Like alpha motor neurons, their cell bodies are located in the anterior grey column of the spinal cord. (wikipedia.org)
- Their axons are smaller than those of the alpha motor neurons, with a diameter of only 5 μm. (wikipedia.org)
- Unlike the alpha motor neurons, gamma motor neurons do not directly adjust the lengthening or shortening of muscles. (wikipedia.org)
- The presence of myelination in gamma motor neurons allows a conduction velocity of 4 to 24 meters per second, significantly faster than with non-myelinated axons but slower than in alpha motor neurons. (wikipedia.org)
- There are three types of lower motor neurons involved in muscle contraction: alpha motor neurons, gamma motor neurons, and beta motor neurons. (wikipedia.org)
- Alpha motor neurons are highly abundant and larger in size than gamma motor neurons. (wikipedia.org)
- Though muscle tension is increasing during the contraction, alpha motor neurons in the spinal cord supplying the muscle are inhibited. (wikipedia.org)
- Types of lower motor neurons are alpha motor neurons, beta motor neurons, and gamma motor neurons. (wikipedia.org)
- All of the axons of these neurons exit or enter each of the first five abdominal ganglia through the second pair of nerves. (uncg.edu)
- Afferents nerves terminating near to the mucosa are in a position to monitor the composition of the luminal contents. (eurekaselect.com)
- In the brainstem, α-MNs and other neurons reside within clusters of cells called nuclei , some of which contain the cell bodies of neurons belonging to the cranial nerves . (wikipedia.org)
- Of most relevance to the direct generation of perceivable sensations, including pain, are the extrinsic sensory afferent neurons innervating the colon and rectum via the spinal nerves. (frontiersin.org)
- Chemical inhibition of these neurons produced a "nerves of steel" state in which defensive reactions were inhibited. (wikipedia.org)
- Afferent and efferent are connected to affect and effect through their common Latin roots: Afferent nerves affect the subject, whereas efferent nerves allow the subject to effect change. (wikipedia.org)
- Besides giving some output to various organs, the vagus nerve comprises between 80% and 90% of afferent nerves mostly conveying sensory information about the state of the body's organs to the central nervous system. (wikipedia.org)
- The somatic nervous system consists of afferent nerves or sensory nerves, and efferent nerves or motor nerves. (wikipedia.org)
- Lower motor neurons (LMNs) are motor neurons located in either the anterior grey column, anterior nerve roots (spinal lower motor neurons) or the cranial nerve nuclei of the brainstem and cranial nerves with motor function (cranial nerve lower motor neurons). (wikipedia.org)
- The change in the architecture within the eye, from convex to concave, also explains why afferent nerves are located on the retina. (wikipedia.org)
- As enteric afferent and efferent nerves do not protrude into the intestinal lumen, EC cells act as a form of sensory transduction. (wikipedia.org)
- Besides motor nerves, there are efferent sensory nerves that often serve to adjust the sensitivity of the signal relayed by the afferent sensory nerve. (wikipedia.org)
- Nerves are bundled along with blood vessels, since the neurons of a nerve have fairly high energy requirements. (wikipedia.org)
- Mixed nerves contain both afferent and efferent axons, and thus conduct both incoming sensory information and outgoing muscle commands in the same bundle. (wikipedia.org)
- Nerves can be categorized into two groups based on function: An afferent nerve fiber conducts sensory information from a sensory neuron to the central nervous system, where the information is then processed. (wikipedia.org)
- Injury to sensory nerves induces neurochemical, physiological, and anatomical modifications to afferent and central neurons, such as afferent terminal sprouting and inhibitory interneuron loss. (wikipedia.org)
- These afferent neurons are CGRP-immunoreactive, and are believed to mediate the spinal reflex pathways to the sympathetic preganglionic neurons, and hence play a significant role in the pathogenesis of NDO. (thefreedictionary.com)
- It may result from the dysfunction of pain signaling pathways at multiple levels, such as cutaneous nociceptors, afferent neurons , and the spinal and supraspinal pathways, he said. (thefreedictionary.com)
- To add further complexity, the proportions of these afferents vary within splanchnic and pelvic pathways, whilst the density of the splanchnic and pelvic innervation also varies along the colon and rectum. (frontiersin.org)
- A sensory system consists of sensory neurons (including the sensory receptor cells), neural pathways , and parts of the brain involved in sensory perception . (wikipedia.org)
- 100 nM) to identify CAP-sensitive and CAP-resistant ST afferent pathways to second-order NTS neurons and tested whether these two groups of neurons had similar intrinsic potassium currents. (elsevier.com)
- A touch or painful stimulus, for example, creates a sensation in the brain only after information about the stimulus travels there via afferent nerve pathways. (wikipedia.org)
- Upper motor neurons (UMNs) send input to α-MNs via several pathways, including (but not limited to) the corticonuclear, corticospinal, and rubrospinal tracts. (wikipedia.org)
- The somatosensory system is a complex system of sensory neurons and pathways that responds to changes at the surface or inside the body. (wikipedia.org)
- According to Jones (2001) there are two primary types of relay neurons in the thalamus of primates-core cells and matrix cells-each creating distinct pathways to various parts and layers throughout the cerebral cortex. (wikipedia.org)
- What Are Afferent and Efferent Neurons? (reference.com)
- Efferent neurons are also known as effector or motor neurons. (reference.com)
- What Is the Difference Between Afferent and Efferent Neurons? (reference.com)
- These motor neurons are called somatic efferent neurons. (thefreedictionary.com)
- The motor information is sent through efferent neurons. (wikipedia.org)
- The three types of these neurons are the alpha efferent neurons, beta efferent neurons, and gamma efferent neurons. (wikipedia.org)
- Cell bodies of primary afferent neurons in the myenteric plexus were identified by their calbindin immunoreactivity and those in the submucous plexus by immunoreactivity for substance P. High proportions of both were immunoreactive for ChAT, viz. (eurekamag.com)
- Sensory information (mechanical, chemical, osmotic) from the GI tract is transduced and transmitted centrally via the afferent vagus nerve, the cell bodies of which lie in the paired nodose ganglia. (frontiersin.org)
- Splanchnic nerve cell bodies are located within the thoracolumbar dorsal root ganglia (DRG), whilst pelvic afferents have cell bodies within the lumbosacral DRG ( Grundy and Brierley, 2018 ). (frontiersin.org)
- The dorsal root ganglia contain the cell bodies of sensory neurons (afferent). (wikipedia.org)
- The vestibular ganglion houses the cell bodies of the bipolar neurons and extends processes to five sensory organs. (wikipedia.org)
- This change in length of the spindle is transduced (transformed into electric membrane potentials) by two types of sensory afferents, whose cell bodies are located in dorsal root ganglia located next to the spinal cord. (wikipedia.org)
- The cell bodies of the sensory neurons are located in the dorsal ganglia of the spinal cord. (wikipedia.org)
- 2012, activates sympathetic neurons whose axons run through the dorsal root ganglia containing cell bodies of the stimulated afferent sensory nerve. (wikipedia.org)
- The roots terminate in dorsal root ganglia, which are composed of the cell bodies of the corresponding neurons. (wikipedia.org)
- 7,SCS activates the inhibitory effect of large primary afferent neurons in the dorsal columns, damping the incoming pain signal. (thefreedictionary.com)
- In fact, inhibitory control of midbrain DA neurons can robustly control behavior. (jneurosci.org)
- 1997 ) were also unable to find low-frequency IE neurons in the rabbit brainstem, although it appears they only used monaural responses to assess the presence of inhibitory input via reductions in spontaneous activity. (jneurosci.org)
- V2 neurons, which include a population of glutamatergic V2a neurons and inhibitory V2b neurons, project ispilaterally and caudally across multiple spinal cord regions. (wikipedia.org)
- Because the interneuron is inhibitory, it prevents the opposing alpha motor neuron from firing, thereby reducing the contraction of the opposing muscle. (wikipedia.org)
- They are GABAergic and, thus, are classified as inhibitory neurons. (wikipedia.org)
- The neurons are multimodal (respond to both touch and pain input), with an inhibitory surround receptive field. (wikipedia.org)
- Alpha ( α ) motor neurons (also called alpha motoneurons ), are large, multipolar lower motor neurons of the brainstem and spinal cord . (wikipedia.org)
- Like other neurons, lower motor neurons have both afferent (incoming) and efferent (outgoing) connections. (wikidoc.org)
- Beta motor neurons have a conduction velocity greater than that of both other types of lower motor neurons, but there is little currently known about beta motor neurons. (wikipedia.org)
- Cranial nerve lower motor neurons control movements of the eyes, face and tongue, and contribute to chewing, swallowing and vocalization. (wikipedia.org)
- Damage to the lower motor neurons can lead to flaccid paralysis, absent deep tendon reflexes and muscle atrophy. (wikipedia.org)
- Damage to lower motor neurons, lower motor neuron lesions (LMNL) cause muscle atrophy, decreased strength and decreased reflexes in affected areas. (wikipedia.org)
- There are two types of motor neuron - upper motor neurons and lower motor neurons. (wikipedia.org)
- These tracts also serve as the place of origin for lower motor neurons. (wikipedia.org)
- There are three primary categories lower motor neurons, which can be further divided in sub-categories. (wikipedia.org)
- the finger flexor reflex is a simple monosynaptic spinal reflex involving the flexor digitorum profundus that is normally fully inhibited by upper motor neurons. (wikipedia.org)
- Loss of Betz cells is a variable effect of this disease but the loss of these cells in this disease demonstrates the "dying-back" (axonopathy) due to the changes in upper motor neurons. (wikipedia.org)
- Upper motor neurons originate in the motor cortex located in the precentral gyrus. (wikipedia.org)
- Afferent neurons are also known as sensory receptor neurons. (reference.com)
- Sensory neurons are nerve cells that run from receptor cells in the body to the sp. (reference.com)
- Light activation of VP neuron terminals elicited GABAergic IPSCs in both dopamine (DA) and non-DA VTA neurons, and these IPSCs were inhibited by the mu opioid receptor agonist DAMGO. (jneurosci.org)
- TG neurons projecting to the cornea were traced with Fast Blue applied onto the cornea of the mice and were identified in TG sections using immunofluorescence techniques against peripherin, neurofilaments 200, TrkA neurotrophic receptor and calcitonin gene related peptide (CGRP). (arvojournals.org)
- The neurocircuitry that mediates arterial baroreflex-mediated inhibition of RVLM presympathetic vasomotor neurons and sympathetic vasomotor outflow is described by a trisynaptic model, which includes N -methyl- d -aspartic acid (NMDA) receptor-mediated activation of propriomedullary GABAergic neurons in the caudal ventrolateral medulla ( 6 , 8 ). (physiology.org)
- The slow and fast extensor motor neurons, the stretch receptor neurons, and the accessory cells branch mostly in the dorsal part of the ganglion. (uncg.edu)
- Interaction between CCK-A receptor and OB-Rs in these neurons likely facilitates leptin mediation of short-term satiety. (eurekaselect.com)
- Because these responses are obtained with lung pressure changes within the physiological range ( Widdicombe, 1961 ), slowly adapting pulmonary receptor afferents (SARs) are likely being selectively activated. (jneurosci.org)
- Are the processes on afferent neurons that go from the sensory receptor to the cell body considered axons or dendrites? (stackexchange.com)
- Vagal afferent neurons (VAN) express the cholecystokinin (CCK) type 1 receptor (CCK1R) and, as predicted with the role of CCK in inducing satiation, CCK1R? (researchassistantresume.com)
- Specifically, we examined changes in GABA transmission to GnRH neurons, which can be excited by GABA A receptor activation. (jneurosci.org)
- Is the Subject Area "Olfactory receptor neurons" applicable to this article? (plos.org)
- Generally a model of simulating cutaneous afferent response should at least consist of the receptor model to emulate the selectivity of each afferent type, and the spiking neuron model to generate action potentials in afferents. (frontiersin.org)
- In current work we treat the tactile receptor and its associated afferents as a single tactile unit. (frontiersin.org)
- They also find that inactivation of the microglial chemokine receptor CX3CR1, which is critical in neuron-microglia communication, prevents neuron loss. (nature.com)
- MedicalMnemonics.com: 3502 3463 367 115 Sensory receptor neurons, a dynamic list of Petilla convention aligned sensory neurons at NeuroLex. (wikipedia.org)
- The term "HSD2 neurons" is used in the scientific literature to refer to a subpopulation of neurons in the NTS which express both the mineralocorticoid receptor (MR) and 11-beta-hydroxysteroid dehydrogenase type 2 (HSD2). (wikipedia.org)
- The sensory neurons involved in smell are called olfactory receptor neurons. (wikipedia.org)
- It has been reported that there are kisspeptin-producing neurons that also express estrogen receptor alpha. (wikipedia.org)
- In contrast, a permanent loss of smell may be caused by death of olfactory receptor neurons in the nose or by brain injury in which there is damage to the olfactory nerve or damage to brain areas that process smell. (wikipedia.org)
- Resiniferatoxin activates transient vanilloid receptor 1 (TRPV1) in a subpopulation of primary afferent sensory neurons involved in nociception (the transmission of physiological pain). (wikipedia.org)
- The specialized olfactory receptor neurons of the olfactory nerve are located in the olfactory mucosa of the upper parts of the nasal cavity. (wikipedia.org)
- These changes contribute to increased NMDA glutamate receptor-dependent excitability of spinal dorsal horn neurons and are restricted to the ipsilateral (injured) side. (wikipedia.org)
- Such a scheme may also be applicable in the case of CCK-induced inhibition of RVLM presympathetic vasomotor neurons ( 21 ). (physiology.org)
- Cell types only identified in the en bloc medulla included type II and III inspiratory neurons, distinguished by delayed onset and peri-inspiratory inhibition, respectively, and preinspiratory neurons, active before and after but silent during inspiration. (jneurosci.org)
- However, the classical descriptions of low-frequency-sensitive neurons report primarily monaural cells with no contralateral inhibition. (jneurosci.org)
- Therefore, these neurons would be expected to be binaural with contralateral inhibition. (jneurosci.org)
- The data demonstrate that low-frequency LSO neurons of cat are not monaural and can exhibit contralateral inhibition like their high-frequency counterparts. (jneurosci.org)
- Similarly, large A-fiber-mediated inhibition of C-fiber-evoked responses in dorsal horn neurons is also diminished ( Woolf and Wall, 1982 ). (jneurosci.org)
- What has not been established, however, is whether there is any nerve injury-induced loss of inhibition in the superficial dorsal horn, the site of termination of small caliber primary afferents, and whether such a loss results from diminished presynaptic or postsynaptic inhibition. (jneurosci.org)
- The motor part of the spindle is provided by motor neurons: up to a dozen gamma motor neurons and one or two beta motor neurons, collectively called fusimotor neurons. (wikipedia.org)
- Gamma motor neurons supply only muscle fibres within the spindle, whereas beta motor neurons supply muscle fibres both within and outside of the spindle. (wikipedia.org)
- Without gamma motor neurons, muscle spindles would be very loose as the muscle contracts more. (wikipedia.org)
- It consists of muscle spindles along with fusimotor neurons - beta motor neurons and gamma motor neurons. (wikipedia.org)
- Gamma bias is gamma motor neurons' consistent level of activity. (wikipedia.org)
- The protective responses triggered by sensory neurons comprise alterations in GI blood flow, secretion, and motility as well as modifications of immune function. (ovid.com)
- These responses constrain the possible cellular and synaptic mechanisms underlying the generation and modulation of respiratory rhythm and pattern and connectivity of identified respiratory neuron types. (jneurosci.org)
- Somatostatin modulates mast cell-induced responses in murine spinal neurons and satellite cells. (semanticscholar.org)
- Electrical activity and synaptic responses were recorded intracellularly in 415 neurons of the mouse superior mesenteric ganglion (SMG) attached to a segment of distal colon in vitro. (elsevier.com)
- To investigate the possible anatomical basis for the functional recovery of visual cortical responses after reverse monocular deprivation, we have studied the morphology of single geniculocortical afferents to area 17. (jneurosci.org)
- This work presents a pieces of Python code to rapidly simulate the spiking responses of large numbers of single cutaneous tactile afferents with millisecond precision. (frontiersin.org)
- Therefore, a model of reproducing responses of SA1, RA1 and PC afferents is feasible, and valuable to investigating tactile sensation. (frontiersin.org)
- The purpose of this investigation was to analyze the influence of stimulus orientation on the responses of individual neurons in the monkey's lateral geniculate nucleus (LGN). (cambridge.org)
- In both the parvocellular and magnocellular layers, the responses of the majority of individual neurons to sine-wave gratings varied as a function of stimulus orientation. (cambridge.org)
- By imaging calcium responses of single neurons and astrocytes in vivo using high resolution imaging methods, his laboratory has discovered that astrocytes have remarkably specific functional properties and mediate blood flow to active brain regions. (wikipedia.org)
- The responses of muscle spindles to changes in length also play an important role in regulating the contraction of muscles, by activating motor neurons via the stretch reflex to resist muscle stretch. (wikipedia.org)
- In mammals, electrical recordings from single afferent nerve fibres have shown that the responses of Merkel nerve endings are characterized by a vigorous response to the onset of a mechanical ramp stimulus (dynamic), and then continued firing during the plateau phase (static). (wikipedia.org)
- It is one of the characteristic responses of an upper motor neuron lesion. (wikipedia.org)
- The ultrastructure of the central terminals of nociceptive primary afferent (Cl terminals) neurons in the mouse substantia gelatinosa was studied by the cytochemical method using fluoride-resistant acid phosphatase (FRAP). (nii.ac.jp)
- Thus, various types of FRAP-positive Cl terminals and some Cll terminals are considered to be central endings of the capsaicin-sensitive nociceptive primary afferents. (nii.ac.jp)
- The (spinal cord) dorsal horn neurons give rise to the spinothalamic tract (STT), which constitutes the major ascending nociceptive pathway. (wikipedia.org)
- Evidence for two different heat transduction mechanisms in nociceptive primary afferents innervating monkey skin. (wikipedia.org)
- These data show the Gate-Control Theory of pain was correct in the prediction that activation of large tactile afferent fibres inhibit the nociceptive afferent signal being transmitted to the brain. (wikipedia.org)
- Nerve injury induces changes in gene transcription in dorsal root ganglion (DRG) neurons, which may contribute to nerve injury-induced neuropathic pain. (nature.com)
- To investigate whether activation of mitogen-activated protein kinase (MAPK) in damaged and/or undamaged primary afferents participates in neuropathic pain after partial nerve injury, we examined the phosphorylation of extracellular signal-regulated protein kinase (ERK), p38 MAPK, and c-Jun N-terminal kinase (JNK) in the L4 and L5 dorsal root ganglion (DRG) in the L5 spinal nerve ligation (SNL) model. (jneurosci.org)
- Among them, the L5 SNL model is unique because the L4 dorsal root ganglion (DRG) neurons are clearly separated from the axotomized L5 DRG neurons. (jneurosci.org)
- Are the neurons in the dorsal root ganglion pseudounipolar? (stackexchange.com)
- Previous studies have show that in rat dorsal root ganglion cells CGRP coexists with most other known neuropeptides and can therefore be used as a general marker for peptide-containing primary afferents. (wright.edu)
- The axons of dorsal root ganglion neurons are known as afferents. (wikipedia.org)
- These channels are found predominantly in smaller sensory neurons in the dorsal root ganglion cells and are activated by higher pressures, two attributes that are characteristic of nociceptors. (wikipedia.org)
- Central Projections of Cervical Primary Afferents in the Rat. (springer.com)
- After the cobalt ions were precipitated and intensified, we studied the central projections of the filled neurons within the ganglionic structures. (uncg.edu)
- Our description of the central projections of the hair afferents is the first in the literature. (uncg.edu)
- Finally, afferent projections from the olfactory bulb into the olfactory tubercle likely represent a rich source of direct olfactory input to the BG. (nih.gov)
- Finally, we determined the afferent and efferent projections of the wake-active dopaminergic cells by combining anterograde and retrograde tracer methods with tyrosine hydroxylase (TH) and Fos immunostaining. (jneurosci.org)
- Marfurt, C & Turner, DF 1984, ' The central projections of tooth pulp afferent neurons in the rat as determined by the transganglionic transport of horseradish peroxidase ', Journal of Comparative Neurology , vol. 223, no. 4, pp. 535-547. (elsevier.com)
- Turner, D. F. / The central projections of tooth pulp afferent neurons in the rat as determined by the transganglionic transport of horseradish peroxidase . (elsevier.com)
- In the PNS, afferent and efferent projections are always from the perspective of the spinal cord (see figures). (wikipedia.org)
- In the CNS, afferent and efferent projections can be from the perspective of any given brain region. (wikipedia.org)
- That is, each brain region has its own unique set of afferent and efferent projections. (wikipedia.org)
- The efferent projections (axonal output) of HSD2 neurons have been investigated to a significant degree using conventional neuroanatomical tracers. (wikipedia.org)
- Additional information about the efferent projections of HSD2 neurons can be found in ref. (wikipedia.org)
- The cortical pyramidal neurons projecting to the striatum are located in layers II-VI, with the most dense projections come from layer V. They end mainly on the dendritic spines of the spiny neurons. (wikipedia.org)
- The different functional modalities represented in the thalamus are segregated in specific anatomical regions, differentiated by the cerebral systems from where they receive their afferent projections. (wikipedia.org)
- Nature Reviews Neuroscience (6):453-66 Kuipers R, Mouton LJ, Holstege G. (January 1, 2006) "Afferent projections to the pontine micturition center in the cat. (wikipedia.org)
- We used guinea pig primary cells, tissue bioassay, in vivo electrophysiology, and a guinea pig conscious cough model to investigate a role for TRPV4 in mediating sensory nerve activation in vagal afferents and the possible downstream signaling mechanisms. (pubmedcentralcanada.ca)
- Here, we used a rat model of subdiaphragmatic vagal deafferentation (SDA), the most complete and selective vagal deafferentation method existing to date, to study the consequences of complete disconnection of abdominal vagal afferents on innate anxiety, conditioned fear, and neurochemical parameters in the limbic system. (jneurosci.org)
- Despite the existing evidence implicating vagal signaling in mood and affect, the relative involvement of vagal afferents versus efferents in the modulation of emotional functions often remains obscure. (jneurosci.org)
- Ghrelin reduces the mechanosensitivity of gastric vagal afferents, so they are less sensitive to gastric distension. (wikipedia.org)
- We have recently shown that sensory vagal and somato-sensory (sciatic nerve) inputs converge in neurons of the rostral ventrolateral medulla oblongata, which was implicated in adjusting visceral activities to changing somatic performances. (gla.ac.uk)
- Raybould HE (2010) Gut chemosensing: interactions between gut endocrine cells and visceral afferents. (springer.com)
- Our results suggest that the potassium-channel differences of second-order NTS neurons contribute to the differential processing of A- and C-type cranial visceral afferents beginning as early as this first central neuron. (elsevier.com)
- The dorsal roots are afferent fascicles, receiving sensory information from the skin, muscles, and visceral organs to be relayed to the brain. (wikipedia.org)
- According to their targets, motor neurons are classified into three broad categories: Somatic motor neurons Special visceral motor neurons General visceral motor neurons Somatic motor neurons originate in the central nervous system, project their axons to skeletal muscles (such as the muscles of the limbs, abdominal, and intercostal muscles), which are involved in locomotion. (wikipedia.org)
- The functional components of the olfactory nerve include SVA, special visceral afferent, which carries the modality of smell. (wikipedia.org)
- Aguyo, L.G., Weight F.F., and White, G, (1991) TTX-insensitive action potentials and excitability of adult sensory neurons cultured in serum- and exogenous nerve growth factor-free medium. (springer.com)
- Several simulation examples were presented in this paper to reproduce action potentials, sensory adaptation, frequency characteristics and spiking timing for each afferent type. (frontiersin.org)
- Spiking neurons exhibit action potentials as a result of a neuron characteristic known as membrane potential. (wikipedia.org)
- Conventional neurons encode information by changes in the rate of action potentials, but for complex senses like vision, this is not sufficient. (wikipedia.org)
- The neurons of the pars reticulata are fast-spiking pacemakers, generating action potentials in the absence of synaptic input. (wikipedia.org)
- In response to, for instance, a rise in the plasma sodium concentration, vasopressin neurons also discharge action potentials in bursts, but these bursts are much longer and are less intense than the bursts displayed by oxytocin neurons, and the bursts in vasopressin cells are not synchronised. (wikipedia.org)
- Previous studies have shown that single neurons can transmit envelope information through changes in firing rate ( 8 , 9 ) when the relationship between the stimulus input and the output firing rate is nonlinear. (pnas.org)
- These neurons use a graded potential to transmit data as they lack the membrane potential that spiking neurons possess. (wikipedia.org)
- The effector neurons leaving the integration center transmit a response to the original tissue the reflex arose resulting in a response. (wikipedia.org)
- Using whole-cell recordings from rat brainstem slices, we examined the effects of melanocortin ligands, α-melanocyte-stimulating hormone (αMSH) and melanotan II (MTII), on EPSC in NTS neurons. (jneurosci.org)
- Despite increasing evidence of the involvement of brainstem vagal circuits in the satiety effects of the melanocortin system, the cellular actions of αMSH on NTS neurons have not been investigated. (jneurosci.org)
- In the intact brainstem, the excitability of respiratory neurons in the pre-BötC is modulated by medullary circuits rostral and caudal to the pre-BötC and by sensory feedback. (jneurosci.org)
- HSD2 neurons are a small group of neurons in the brainstem which are uniquely sensitive to the mineralocorticosteroid hormone aldosterone, through expression of HSD11B2. (wikipedia.org)
- The central auditory system converges inputs from both ears (inputs contain no explicit spatial information) onto single neurons within the brainstem. (wikipedia.org)
- Other PVN neurons control various anterior pituitary functions, while still others directly regulate appetite and autonomic functions in the brainstem and spinal cord. (wikipedia.org)
- The centrally-projecting neurons include Parvocellular oxytocin cells, which project mainly to the brainstem and spinal cord. (wikipedia.org)
- These neurons are thought to have a role in gastric reflexes and penile erection, Parvocellular vasopressin cells, which project to many points in the hypothalamus and limbic system, as well as to the brainstem and spinal cord (these are involved in blood pressure and temperature regulation), and brown fat thermogenesis. (wikipedia.org)
- Some other inputs come from the brainstem, including from some of the noradrenergic neurons of the nucleus of the solitary tract and the ventrolateral medulla. (wikipedia.org)
- A neuron is a specialized type of cell found in the bodies of all eumetozoans. (wikipedia.org)
- Damage to gray matter, bodies of neurons, or white matter of axons in the cingulum therefore can affect humans cognitively because of this damage. (wikipedia.org)
- Both of these actions decrease GABAergic input onto VTA neurons, revealing two mechanisms by which endogenous or exogenous opioids can activate VTA neurons, including DA neurons. (jneurosci.org)
- However, VTA DA neurons also receive dense GABAergic inputs from extrinsic sources and opioid control of these extrinsically derived inputs also robustly controls VTA DA neuron firing (see below). (jneurosci.org)
- Neurons expressing the D1 subtype were immunopositive for met-enkephalin and vesicular glutamate transporter VGLUT2, but not for GABAergic marker vGAT. (jneurosci.org)
- The type I, GABAergic, septohippocampal afferents were shown to terminate on neurons immunoreactive for each of the three peptides. (elsevier.com)
- Spontaneous GABAergic postsynaptic currents (PSCs) were recorded in GnRH neurons from OVX+E and OVX mice in coronal and sagittal slices. (jneurosci.org)
- This indicates estradiol acts on multiple GABAergic afferent populations to increase transmission through both activity-dependent and -independent mechanisms. (jneurosci.org)
- These afferents are GABAergic, inhibiting neurons in the subthalamic nucleus. (wikipedia.org)
- 1996) offers partial support to this claim by suggesting that thalamic GABAergic local circuit neurons in mammalian brains relate more to processing ability compared to sensorimotor ability, as they reflect an increasing complexity of local information processing in the thalamus. (wikipedia.org)
- 3) These neurons increased their discharge rates in response to hypertonic solutions covering the ocular surface, suggesting that increased concentration of solutes caused by evaporation of fluid from the ocular surface may be another adequate stimulus for these neurons. (arvojournals.org)
- In both systems, we show that correlated but not single-neuron activity can provide detailed information about second-order stimulus features. (pnas.org)
- Together, our work indicates that hair-cell ribbon size influences the spontaneous spiking and the precise encoding of stimulus onset in afferent neurons. (jneurosci.org)
- Our specific goals were to assess the prevalence and the degree of orientation tuning in the monkey LGN and to determine if the preferred stimulus orientations of LGN neurons varied as a function of receptive-field position. (cambridge.org)
- Thus, by prolonging subthreshold depolarization, intrinsic inward currents allow tonic neurons in spinal lamina I to specialize as integrators that are optimally suited to encode stimulus intensity. (jneurosci.org)
- In response to a stimulus, ions travel through channels in the membrane of a neuron, which leads to a change in the electrical potential of the membrane. (elifesciences.org)
- Each neuron also responded to a visual stimulus near or approaching the tactile receptive field. (wikipedia.org)
- Chemical enhancement of these neurons produced a "super flincher" state in which any mild stimulus, such as an object gently moved toward the face, evoked a full-blown flinching reaction. (wikipedia.org)
- This differential sensitivity of the A1 and A2 sensory neurons leads to stimulus filtering of the bat vocalizations. (wikipedia.org)
- Alternatively, some sensory neurons can respond to a chemical stimulus that produces an itch sensation. (wikipedia.org)
- When afferent feedback is provided, the scratch response is more accurate in terms of accessing the stimulus site. (wikipedia.org)
- interaction between primary afferents, mast cells, and sympathetic efferents. (springer.com)
- In accord with its effects on sympathetic vasomotor outflow, CCK selectively inhibits the discharge of a subpopulation of rostral ventrolateral medulla (RVLM) presympathetic neurons ( 17 , 18 ). (physiology.org)
- RVLM presympathetic vasomotor neurons are considered to play a major role in the generation of sympathetic vasomotor outflow, control of sympathetic cardiovascular reflexes, and arterial blood pressure ( 3 , 8 ). (physiology.org)
- Cardiopulmonary sympathetic afferent input to lower thoracic spinal neurons. (semanticscholar.org)
- Location and numbers of neurons associated with sympathetic innervation of the heart within the right stellate and accessory cervical ganglia, the spinal cord, and spinal ganglia were investigated using horseradish peroxidase retrograde axonal transport techniques in cats. (semanticscholar.org)
- These results show that mouse SMG neurons receive colonic mechanosensory afferent synaptic input and thus may participate in sympathetic intestinal reflexes. (elsevier.com)
- Activation of the cardiac "sympathetic afferent" reflex (CSAR) has been reported to depress the arterial baroreflex and enhance the arterial chemoreflex via a central mechanism. (nebraska.edu)
- sensory afferents or sympathetic neurons). (frontiersin.org)
- release from afferent terminals. (jneurosci.org)
- The axons of the parvocellular neurosecretory neurons of the PVN project to the median eminence, a neurohemal organ at the base of the brain, where their neurosecretory nerve terminals release their hormones at the primary capillary plexus of the hypophyseal portal system. (wikipedia.org)
- The median eminence contains fiber terminals from many hypothalamic neuroendocrine neurons, secreting different neurotransmitters or neuropeptides, including vasopressin, corticotropin-releasing hormone (CRH), thyrotropin-releasing hormone (TRH), gonadotropin-releasing hormone (GnRH), growth hormone-releasing hormone (GHRH), dopamine (DA) and somatostatin (growth hormone release inhibiting hormone, GIH) into blood vessels in the hypophyseal portal system. (wikipedia.org)
- Neural communication is any type of signaling between neurons throughout the nervous system. (reference.com)
- These neurons connect neurons together (with other neurons) within the same region in neural networks- so location is important. (hubpages.com)
- The primary motivation for this research was to gain insight into the receptive-field configuration of LGN neurons and consequently into the neural mechanisms which determine the spatial organization of LGN receptive fields in primates. (cambridge.org)
- Studies have been done on the non-spiking neuron qualities in animals of specific non-spiking neural networks that have a corollary in humans, e.g. retina amacrine cell of the eye. (wikipedia.org)
- Spiking neurons and non-spiking neurons are usually integrated into the same neural network, but they possess specific characteristics. (wikipedia.org)
- Three regions make up the accommodation neural circuit, the afferent limb, the efferent limb and the ocular motor neurons that are between the afferent and efferent limb. (wikipedia.org)
- In neuroscience, a biological neural network is a series of interconnected neurons whose activation defines a recognizable linear pathway. (wikipedia.org)
- The connections between neurons are much more complex than those implemented in neural computing architectures. (wikipedia.org)
- One principle by which neurons work is neural summation, i.e. potentials at the post synaptic membrane will sum up in the cell body. (wikipedia.org)
- Neurons can connect to each other to form neural networks. (wikipedia.org)
- The pupillary light reflex neural pathway on each side has an afferent limb and two efferent limbs. (wikipedia.org)
- Although neurons generally follow a basic morphological pattern (consisting of the tree-like dendritic arbor, a cell body, and an axonal output), the number of pre-and post-synaptic elements are unique to every neuron and are central to understanding their complex neural function. (wikipedia.org)
- A key factor in the neural plasticity underlying neuropathic pain is altered gene expression in sensory dorsal root ganglia neurons. (wikipedia.org)
- Non-spiking neurons were identified as a special kind of interneuron and function as an intermediary point of process for sensory-motor systems. (wikipedia.org)
- It is dependent on cranial nerve II (afferent limb of reflex), superior centers (interneuron) and cranial nerve III (efferent limb of reflex). (wikipedia.org)
- Via their dendrites in the outer molecular layer, the SS-immunoreactive neurons receive synaptic inputs from perforant pathway axons which were identified by their anterograde degeneration following entorhinal lesions. (nih.gov)
- Most high-frequency-sensitive LSO neurons are binaural, receiving inputs from both ears. (jneurosci.org)
- The laboratory studies the mechanisms by which visual neurons at the earliest stages of cortical processing are influenced not only by "bottom up" visual inputs but also in "top down" manner by mental state, including attention and expectation. (wikipedia.org)
- Subplate neurons are the first cortical neurons to receive synaptic inputs from thalamic axons, establishing a temporary link between thalamic axons and their final target in layer 4. (wikipedia.org)
- The PVN receives afferent inputs from many brain regions and different parts of the body, by hormonal control. (wikipedia.org)
- Among these, inputs from neurons in structures adjacent to the anterior wall of the third ventricle (the "AV3V region") carry information about the electrolyte composition of the blood, and about circulating concentrations of such hormones as angiotensin and relaxin, to regulate the magnocellular neurons. (wikipedia.org)
- Inputs from neuropeptide Y-containing neurons in the arcuate nucleus coordinate metabolic regulation (via TRH secretion) with regulation of energy intake. (wikipedia.org)
- In preparations with movement-related sensory inputs, the muscles and the motor neuron outputs to muscles are left intact, allowing sensory feedback from the moving limb. (wikipedia.org)
- Neurons have special cell parts called dendrites and axons. (reference.com)
- Correlated light and electron microscopic analysis demonstrated that many SS-immunoreactive neurons in the hilus send dendritic processes into the outer molecular layer of the fascia dentata, and dendrites of the same neurons occupy broad areas in the dentate hilar area. (nih.gov)
- Play media The principal type of neuron found in the subthalamic nucleus has rather long, sparsely spiny dendrites. (wikipedia.org)
- Ia afferents from the muscle spindle terminate on the proximal dendrites of motor neurons. (wikipedia.org)
- Their dendrites as well as the pallidal are preferentially perpendicular to the striatal afferents. (wikipedia.org)
- They make connections with the dopamine neurons of the pars compacta whose long dendrites plunge deeply in the pars reticulata. (wikipedia.org)
- Dendrites of central nervous system neurons grow by addition and retraction of thin branches. (wikipedia.org)
- In 1983 Thoroya Abdel-Maguid and David Bowsher expanded upon the golgi method and combined it with an impregnation technique which allowed them to visualize the dendrites of neurons and classify them based on their dendritic patterns. (wikipedia.org)
- GnRH neurons originate in the nose and migrate into the brain, where they are scattered throughout the medial septum and hypothalamus and connected by very long >1-millimeter-long dendrites. (wikipedia.org)
- This book is based on contributions presented at the symposion "The Primary Afferent Neuron: A survey oj recent morpho:functional aspects. (springer.com)
- As sCientific research on the primary afferent neuron is so extensive. (springer.com)
- shows how morphological research contributes to our present -day concepts of the primary afferent neuron. (springer.com)
- Sub-Populations of Smaller Diameter Trigeminal Primary Afferent Neuron" by Francisco J. Alvarez, H. R. Morris et al. (wright.edu)
- Slow modulation consistent with facilitation was apparent in the earlier onset of pre-I firing before inspiration and loss of postinspiratory firing and in the earlier onset of depolarization in type 2 neurons. (jneurosci.org)
- At 22 hr after depolarization, by which time death of neurons in 80K has begun, elevated [Ca 2+ ] i levels in surviving neurons in 80K are not higher than those in neurons in 30K (∼150-450 n m ), suggesting that neurons with high [Ca 2+ ] i are preferentially lost. (jneurosci.org)
- Simulations using NEURON software demonstrated that I Na,P was necessary and sufficient to explain amplification, whereas I Na,P and I Ca,P acted synergistically to prolong depolarization: initial activation of the slower current ( I Ca,P ) depended on the faster current ( I Na,P ) but maintained activation of the faster current likewise depended on the slower current. (jneurosci.org)
- It is believed, however, that sensory neurons employ fast, mechanically gated cation channels, and that the depolarization that results across the membrane is followed by the generation of a sodium-dependent action potential at the transduction site. (wikipedia.org)
- This was the first description of a command neuron-mediated behavior and it indicated that the depolarization of a neuron could precipitate complex innate behaviors in some organisms. (wikipedia.org)
- VAChT immunoreactivity was in the majority of calbindin-immunoreactive varicosities in the myenteric ganglia, submucous ganglia and mucosa and also in the majority of the varicosities of neurons that were immunoreactive for calretinin and somatostatin and that had been previously established as being cholinergic. (eurekamag.com)
- Together with our previous descriptions of the flexor motor neurons, these results allow us to relate both rapid tail-flips and slower postural movements to the structure of the segmental ganglia. (uncg.edu)
- Neurons of the nodose ganglia respond to intraduodenal perfusions of maltose, glucose, and hypertonic saline. (eurekaselect.com)
- Several peptides were detected in primary sensory neurons located in nodose and dorsal root ganglia and projecting from rat cecum and rectosigmoid, through a combination of retrograde staining by the fluorescent tracer DY-2HCl and of the immunofluorescent procedure of Coons. (semanticscholar.org)
- All primary sensory neurons that enter the spinal cord originate in ganglia that are located in openings in the vertebral column called the intervertebral foramina. (britannica.com)
- The ENS in human contains 200-600 million neurons, distributed in many thousands of small ganglia, the great majority of which are found in two plexuses, the myenteric and submucosal plexuses. (springer.com)
- Neurons also project from the ENS to prevertebral ganglia, the gallbladder, pancreas and trachea. (springer.com)
- The first order neuron enters the spinal cord through the dorsal root ganglia and branches in the spinal cord. (wikipedia.org)
- Processes from the organ of Corti conduct afferent transmission to the spiral ganglia. (wikipedia.org)
- The principal neurons are glutamatergic, which give them a particular functional position in the basal ganglia system. (wikipedia.org)
- Except for the connection to the striatum (17.3% in macaques), most of the subthalamic principal neurons are multitargets and directed to the other elements of the core of the basal ganglia. (wikipedia.org)
- The striatum, or corpus striatum (also called the neostriatum and the striate nucleus) is a nucleus (a cluster of neurons) in the subcortical basal ganglia of the forebrain. (wikipedia.org)
- They are smaller and thinner than the dopaminergic neurons and conversely identical and morphologically similar to the pallidal neurons (see primate basal ganglia). (wikipedia.org)
- Intrafusal muscle fiber Type II sensory fiber Gamma motor neuron Beta motor neuron Proprioception Motor system Muscle Muscle spindle Reflex action Boyd, I. A. (1980). (wikipedia.org)
- In females, ovarian steroid hormones exert both negative and positive feedback to modulate GnRH neuron function and pituitary responsiveness to GnRH. (jneurosci.org)
- Neurons that have this bistable ability have the potential to be gated because outside gatekeeper neurons can modulate the membrane potential of the gated neuron by selectively shifting them from the up state to the down state. (wikipedia.org)
- Synaptic connections of SS-immunoreactive neurons were determined at the electron microscopic level by using normal and colchicine pretreated rats. (nih.gov)
- Recordings were made from CCK-sensitive RVLM presympathetic vasomotor neurons in halothane-anesthetized, paralyzed male Sprague-Dawley rats. (physiology.org)
- Single sensory neurons innervating the cornea were recorded in vivo extracellularly from the trigeminal ganglion of isoflurane-anesthetized rats with tungsten microelectrodes. (arvojournals.org)
- Peptide immunocytochemistry in afferent neurons from lower gut in rats. (semanticscholar.org)
- We identified wake-active dopaminergic neurons by combining immunohistochemical staining for Fos and tyrosine hydroxylase (TH) in awake and sleeping rats. (jneurosci.org)
- Multiple different manipulations successfully reproduced or reversed neuropathic changes in primary afferents from naïve or nerve-injured rats, respectively, thus confirming the predicted criticality and its degenerate basis. (elifesciences.org)
- To date, HSD2 neurons have been identified and studied only in rats and mice. (wikipedia.org)
- Aldosterone is not necessary for HSD2 neuron activation because this can be evoked by sodium deprivation even in rats without adrenal glands, which are the exclusive source of circulating aldosterone. (wikipedia.org)
- Antibodies against choline acetyltransferase (ChAT) and the vesicular acetylcholine transporter (VAChT) were used to determine whether neurons that have previously been identified as intrinsic primary afferent neurons in the guinea-pig small intestine have a cholinergic phenotype. (eurekamag.com)
- We conclude that the intrinsic primary afferent neurons are cholinergic and that they may release transmitter from their sensory endings in the mucosa. (eurekamag.com)
- Until recently, little was known about intrinsic properties of lamina I neurons. (jneurosci.org)
- The development of the morphological features of neurons is governed by both intrinsic and extrinsic factors. (wikipedia.org)
- 14% of submucosal plexus neurons are sensory neurons - Dogiel type II, also known as enteric primary afferent neurons or intrinsic primary afferent neurons. (wikipedia.org)
- The termination pattern of septohippocampal axons visualized by anterograde transport of Phaseolus vulgaris leucoagglutinin was studied in the hippocampal formation in the rat, with special reference to the innervation of neurons immunoreactive for the neuroactive peptides cholecystokinin, somatostatin or vasoactive intestinal polypeptide. (elsevier.com)
- In this review we traverse this complicated landscape to elucidate afferent function, structure, and nomenclature to provide insights into how the extrinsic sensory afferent innervation of the colon and rectum gives rise to physiological defecatory reflexes and sensations of discomfort, bloating, urgency, and pain. (frontiersin.org)
- Efferent innervation is via static γ motor neurons. (wikipedia.org)
- Sensory Mechanisms of the Spinal Cord: Volume 1 Primary Afferent Neurons and the Spinal Dorsal Horn. (wikipedia.org)
- These sensory neurons react to GI insults by triggering protective autonomic reflexes including the so-called cholinergic anti-inflammatory reflex. (ovid.com)
- Hair cells typically possess both glutamatergic afferent connections and cholinergic efferent connections. (wikipedia.org)
- In the mammalian cochlea, acoustic information is carried to the brain by the predominant (95%) large-diameter, myelinated type I afferents, each of which is postsynaptic to a single inner hair cell. (pnas.org)
- Estradiol and the diurnal cycle thus interact to induce shifts in both GABA transmission and postsynaptic response that would produce appropriate changes in GnRH neuron firing activity and hormone release. (jneurosci.org)
- Spiral ganglion neurons (SGNs) require both pre- and postsynaptic contacts to maintain viability. (jneurosci.org)
- One vesicle release from the presynaptic hair cell onto the postsynaptic bouton is enough to create an action potential in the auditory afferent cells. (wikipedia.org)
- it affects the output signal of the postsynaptic neuron. (wikipedia.org)
- A neuron in the brain requires a single signal to a neuromuscular junction to stimulate contraction of the postsynaptic muscle cell. (wikipedia.org)
- it occurs when a neuron in the central nervous system is damaged and causes the degeneration of a postsynaptic neuron associated with a similar function as the presynaptic neuron. (wikipedia.org)
- Once assimilated and integrated, NTS neurons relay this information to the adjacent dorsal motor nucleus of the vagus (DMV) which contains the preganglionic parasympathetic motoneurons which provide the output response back to the upper GI tract via the efferent vagus nerve. (frontiersin.org)
- PNS afferents are the axons of sensory neurons carrying sensory information from all over the body, into the spine. (wikipedia.org)
- The inflammation of motor neurons causes symptoms ranging from muscle weakness to complete paralysis. (britannica.com)
- Generally the premotor cortex has strong afferent (input) and efferent (output) connectivity to the primary motor cortex, the supplementary motor area, the superior and inferior parietal cortex, and prefrontal cortex. (wikipedia.org)
- Studies show that these neurons may offer a contribution to learning and modulation of motor neuron networks. (wikipedia.org)
- Subplate neurons appear to be selectively sensitive to injury (such as hypoxia) which in humans are associated with motor and cognitive defects . (wikipedia.org)
- Their functions include the processing of sensory input, the modulation of motor neuron activity, the coordination of activity at different spinal levels, and the relay of sensory or proprioceptive data to the brain. (wikipedia.org)
- The corticonuclear and corticospinal tracts are commonly encountered in studies of upper and lower motor neuron connectivity in the control of voluntary movements. (wikipedia.org)
- The medial rectus is innervated by motor neurons in the oculomotor nucleus and nerve. (wikipedia.org)
- There is little detailed data on central activation for contagious itching, but it is hypothesized that a human mirror neuron system exists in which we imitate certain motor actions when we view others performing the same action. (wikipedia.org)
- One branch innervates the alpha motor neuron that causes the homonymous muscle to contract, producing the reflex. (wikipedia.org)
- However, if a "misfiring" of motor neurons occurs, causing simultaneous contraction of opposing muscles, a tear can occur. (wikipedia.org)
- The neurons of the pars reticulata through the nigrothalamic bundle send axons to a particular part of the motor thalamus. (wikipedia.org)
- The sensitivity of detecting changes in muscle length are adjusted by fusimotor neurons - gamma and beta motor neurons. (wikipedia.org)
- Muscle spindles consist of both sensory neurons and motor neurons in order to provide proprioception and make the appropriate movements via firing of motor neurons. (wikipedia.org)
- These findings are in contrast to findings in upper motor neuron lesions. (wikipedia.org)
- Bell's Palsy, Bulbar palsy, Poliomyelitis and Amyotrophic lateral sclerosis (ALS) are all pathologies associated with lower motor neuron dysfunction. (wikipedia.org)
- The efferent motor neurons on the other hand adapted to the new situation and crossed. (wikipedia.org)
- Since most efferent motor neurons are crossed it seems that the CNS evolution is strongly influenced by the visual input. (wikipedia.org)
- The Babinski sign can indicate upper motor neuron lesion constituting damage to the corticospinal tract. (wikipedia.org)
- The Hoffmann's reflex is sometimes described as the upper limb equivalent of the Babinski sign because both indicate upper motor neuron dysfunction. (wikipedia.org)
- The cell body of the motor neuron is satellite-shaped. (wikipedia.org)
- The motor neuron is present in the grey matter of the spinal cord and medulla oblongata, and forms an electrochemical pathway to the effector organ or muscle. (wikipedia.org)
- Beta motor neurons target both types of muscle fiber and there are two types known as static and dynamic. (wikipedia.org)
- Second, the motor neuron from the spinal cord is inhibited via an IPSP and muscle relaxes. (wikipedia.org)
- Motor neurons begin to develop early in embryonic development, and motor function continues to develop well into childhood. (wikipedia.org)
- The OLIG2 gene being the most important due to its role in promoting Ngn2 expression, a gene that causes cell cycle exiting as well as promoting further transcription factors associated with motor neuron development. (wikipedia.org)
- Further specification of motor neurons occurs when retinoic acid, fibroblast growth factor, Wnts, and TGFb, are integrated into the various Hox transcription factors. (wikipedia.org)
- In the spinal column Hox 4-11 sort motor neurons to one of the five motor columns. (wikipedia.org)
- In comparison, parvalbumin immuno-reactive neurons (PIR neurons) can be found only in principal sensory and motor relay nuclei, and in the pulvinar as well the asintralaminar nuclei. (wikipedia.org)
- Commissural nucleus Lamina IX: lateral (in limb regions) and medial motor neurons, also phrenic and spinal accessory nuclei at cervical levels, and Onuf's nucleus in the sacral region Centrally Lamina X: Central Zone, grey matter surrounding the central canal Rexed B (1952). (wikipedia.org)
- ENG recordings are used to record electrical activity from motor neurons and spinal cord neurons. (wikipedia.org)
- The vestibulocochlear nerve carries axons of type SSA, special somatic afferent, which carry the modalities of hearing and equilibrium. (wikipedia.org)
- The target of these neurons varies, but in the somatic nervous system the target will be some sort of muscle fiber. (wikipedia.org)
- This finding, together with previous evidence that type II afferents respond weakly to synaptic transmission from cochlear hair cells, and normally are insensitive to sound, supports the identification of type II afferents as cochlear nociceptors, mediating the sensation of painfully loud sound. (pnas.org)
- However, there is strong evidence for generation of substantial numbers of new neurons in two brain areas, the hippocampus and olfactory bulb. (wikipedia.org)
- those found in the central nervous system are called neurons or nerve cells, and they are responsible for carrying messages within the body. (reference.com)
- Afferent neurons, also known as sensory neurons, carry sensory information to the central nervous system, or CNS. (reference.com)
- A neuron confined entirely to the central nervous system. (thefreedictionary.com)
- The central nervous system, composed of the brain, spinal cord and an extensive neuron network, serves as the control center for all bodily functions. (reference.com)
- For the nervous system to function correctly, specific patterns of synaptic connections must be established between appropriate groups of neurons. (jneurosci.org)
- Neurons are a specialized type of cell of the nervous system- but not the sole cell type. (hubpages.com)
- These are the neurons located in the central nervous system or CNS. (hubpages.com)
- Unlike the majority of neurons found in the central nervous system, an action potential in posterior root ganglion neuron may initiate in the distal process in the periphery, bypass the cell body, and continue to propagate along the proximal process until reaching the synaptic terminal in the posterior horn of spinal cord. (wikipedia.org)
- Again, depending on the stress and strain the muscles sustains, this afferent and efferent coordination will measure the "stretch of the spring" and communicate the results to the central nervous system. (wikipedia.org)
- How does the central nervous system control gamma fusimotor neurons? (wikipedia.org)
- The body's neurons, plus the glial cells that give them structural and metabolic support, together constitute the nervous system. (wikipedia.org)
- A sensory nerve, also called an afferent nerve, is a nerve that carries sensory information toward the central nervous system (CNS). (wikipedia.org)
- First, as a load is placed on the muscle, the afferent neuron from the Golgi tendon organ fires into the central nervous system. (wikipedia.org)
- CART peptide manifestation in nodose neurons, c-fos-IR in hindbrain and arcuate nucleus were compared by two-way ANOVA followed by post hoc analysis with Holm-Sidaks multiple assessment test for the effects of genotype, diet or treatment. (researchassistantresume.com)
- GnRH is a tropic peptide hormone synthesized and released from GnRH neurons within the hypothalamus. (wikipedia.org)
- Supraoptic neurons are unusual because of the large amounts of peptide that they secrete, and because they secrete the peptides into the blood. (wikipedia.org)
- The neurons of this lamina can be distinguished by their morphology as pyramidal, spindle, or multipolar. (wikipedia.org)
- In the medial region it contains medium-sized triangular neurons and the lateral region contains medium-sized multipolar neurons. (wikipedia.org)
- Neurons can be morphologically characterized as unipolar, bipolar, or multipolar. (wikipedia.org)