Nerve Fibers
Sciatic Nerve
A nerve which originates in the lumbar and sacral spinal cord (L4 to S3) and supplies motor and sensory innervation to the lower extremity. The sciatic nerve, which is the main continuation of the sacral plexus, is the largest nerve in the body. It has two major branches, the TIBIAL NERVE and the PERONEAL NERVE.
Nerve Fibers, Myelinated
A class of nerve fibers as defined by their structure, specifically the nerve sheath arrangement. The AXONS of the myelinated nerve fibers are completely encased in a MYELIN SHEATH. They are fibers of relatively large and varied diameters. Their NEURAL CONDUCTION rates are faster than those of the unmyelinated nerve fibers (NERVE FIBERS, UNMYELINATED). Myelinated nerve fibers are present in somatic and autonomic nerves.
Optic Nerve
The 2nd cranial nerve which conveys visual information from the RETINA to the brain. The nerve carries the axons of the RETINAL GANGLION CELLS which sort at the OPTIC CHIASM and continue via the OPTIC TRACTS to the brain. The largest projection is to the lateral geniculate nuclei; other targets include the SUPERIOR COLLICULI and the SUPRACHIASMATIC NUCLEI. Though known as the second cranial nerve, it is considered part of the CENTRAL NERVOUS SYSTEM.
Peripheral Nerves
The nerves outside of the brain and spinal cord, including the autonomic, cranial, and spinal nerves. Peripheral nerves contain non-neuronal cells and connective tissue as well as axons. The connective tissue layers include, from the outside to the inside, the epineurium, the perineurium, and the endoneurium.
Optic Nerve Diseases
Conditions which produce injury or dysfunction of the second cranial or optic nerve, which is generally considered a component of the central nervous system. Damage to optic nerve fibers may occur at or near their origin in the retina, at the optic disk, or in the nerve, optic chiasm, optic tract, or lateral geniculate nuclei. Clinical manifestations may include decreased visual acuity and contrast sensitivity, impaired color vision, and an afferent pupillary defect.
Dietary Fiber
Nerve Endings
Branch-like terminations of NERVE FIBERS, sensory or motor NEURONS. Endings of sensory neurons are the beginnings of afferent pathway to the CENTRAL NERVOUS SYSTEM. Endings of motor neurons are the terminals of axons at the muscle cells. Nerve endings which release neurotransmitters are called PRESYNAPTIC TERMINALS.
Muscle Fibers, Skeletal
Large, multinucleate single cells, either cylindrical or prismatic in shape, that form the basic unit of SKELETAL MUSCLE. They consist of MYOFIBRILS enclosed within and attached to the SARCOLEMMA. They are derived from the fusion of skeletal myoblasts (MYOBLASTS, SKELETAL) into a syncytium, followed by differentiation.
Retinal Ganglion Cells
Neurons of the innermost layer of the retina, the internal plexiform layer. They are of variable sizes and shapes, and their axons project via the OPTIC NERVE to the brain. A small subset of these cells act as photoreceptors with projections to the SUPRACHIASMATIC NUCLEUS, the center for regulating CIRCADIAN RHYTHM.
Optic Disk
Sural Nerve
Cochlear Nerve
Neural Conduction
Tomography, Optical Coherence
Nerve Fibers, Unmyelinated
A class of nerve fibers as defined by their nerve sheath arrangement. The AXONS of the unmyelinated nerve fibers are small in diameter and usually several are surrounded by a single MYELIN SHEATH. They conduct low-velocity impulses, and represent the majority of peripheral sensory and autonomic fibers, but are also found in the BRAIN and SPINAL CORD.
Tibial Nerve
Median Nerve
Nerve Block
Ulnar Nerve
Facial Nerve
The 7th cranial nerve. The facial nerve has two parts, the larger motor root which may be called the facial nerve proper, and the smaller intermediate or sensory root. Together they provide efferent innervation to the muscles of facial expression and to the lacrimal and SALIVARY GLANDS, and convey afferent information for TASTE from the anterior two-thirds of the TONGUE and for TOUCH from the EXTERNAL EAR.
Ophthalmic Nerve
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.
Spinal Nerve Roots
Paired bundles of NERVE FIBERS entering and leaving the SPINAL CORD at each segment. The dorsal and ventral nerve roots join to form the mixed segmental spinal nerves. The dorsal roots are generally afferent, formed by the central projections of the spinal (dorsal root) ganglia sensory cells, and the ventral roots are efferent, comprising the axons of spinal motor and PREGANGLIONIC AUTONOMIC FIBERS.
Mineral Fibers
Long, pliable, cohesive natural or manufactured filaments of various lengths. They form the structure of some minerals. The medical significance lies in their potential ability to cause various types of PNEUMOCONIOSIS (e.g., ASBESTOSIS) after occupational or environmental exposure. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p708)
Ubiquitin Thiolesterase
Spinal Nerves
Glaucoma
An ocular disease, occurring in many forms, having as its primary characteristics an unstable or a sustained increase in the intraocular pressure which the eye cannot withstand without damage to its structure or impairment of its function. The consequences of the increased pressure may be manifested in a variety of symptoms, depending upon type and severity, such as excavation of the optic disk, hardness of the eyeball, corneal anesthesia, reduced visual acuity, seeing of colored halos around lights, disturbed dark adaptation, visual field defects, and headaches. (Dictionary of Visual Science, 4th ed)
Muscle Fibers, Slow-Twitch
Muscle Fibers, Fast-Twitch
Femoral Nerve
Nerve Growth Factor
Radial Nerve
A major nerve of the upper extremity. In humans the fibers of the radial nerve originate in the lower cervical and upper thoracic spinal cord (usually C5 to T1), travel via the posterior cord of the brachial plexus, and supply motor innervation to extensor muscles of the arm and cutaneous sensory fibers to extensor regions of the arm and hand.
Nerve Tissue
Cotton Fiber
Nerve Growth Factors
Mandibular Nerve
Diagnostic Techniques, Ophthalmological
Calcitonin Gene-Related Peptide
Calcitonin gene-related peptide. A 37-amino acid peptide derived from the calcitonin gene. It occurs as a result of alternative processing of mRNA from the calcitonin gene. The neuropeptide is widely distributed in neural tissue of the brain, gut, perivascular nerves, and other tissue. The peptide produces multiple biological effects and has both circulatory and neurotransmitter modes of action. In particular, it is a potent endogenous vasodilator.
Nerve Compression Syndromes
Glossopharyngeal Nerve
The 9th cranial nerve. The glossopharyngeal nerve is a mixed motor and sensory nerve; it conveys somatic and autonomic efferents as well as general, special, and visceral afferents. Among the connections are motor fibers to the stylopharyngeus muscle, parasympathetic fibers to the parotid glands, general and taste afferents from the posterior third of the tongue, the nasopharynx, and the palate, and afferents from baroreceptors and CHEMORECEPTOR CELLS of the carotid sinus.
Phrenic Nerve
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)
Substance P
Peripheral Nervous System Diseases
Cranial Nerves
Action Potentials
Vestibulocochlear Nerve
The 8th cranial nerve. The vestibulocochlear nerve has a cochlear part (COCHLEAR NERVE) which is concerned with hearing and a vestibular part (VESTIBULAR NERVE) which mediates the sense of balance and head position. The fibers of the cochlear nerve originate from neurons of the SPIRAL GANGLION and project to the cochlear nuclei (COCHLEAR NUCLEUS). The fibers of the vestibular nerve arise from neurons of Scarpa's ganglion and project to the VESTIBULAR NUCLEI.
Sympathetic Nervous System
The thoracolumbar division of the autonomic nervous system. Sympathetic preganglionic fibers originate in neurons of the intermediolateral column of the spinal cord and project to the paravertebral and prevertebral ganglia, which in turn project to target organs. The sympathetic nervous system mediates the body's response to stressful situations, i.e., the fight or flight reactions. It often acts reciprocally to the parasympathetic system.
Birefringence
Ranvier's Nodes
Retina
The ten-layered nervous tissue membrane of the eye. It is continuous with the OPTIC NERVE and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the CHOROID and the inner surface with the VITREOUS BODY. The outer-most layer is pigmented, whereas the inner nine layers are transparent.
Olfactory Nerve
Visual Field Tests
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.
Immunohistochemistry
Myelin Sheath
The lipid-rich sheath surrounding AXONS in both the CENTRAL NERVOUS SYSTEMS and PERIPHERAL NERVOUS SYSTEM. The myelin sheath is an electrical insulator and allows faster and more energetically efficient conduction of impulses. The sheath is formed by the cell membranes of glial cells (SCHWANN CELLS in the peripheral and OLIGODENDROGLIA in the central nervous system). Deterioration of the sheath in DEMYELINATING DISEASES is a serious clinical problem.
Stress Fibers
Microscopy, Electron
Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.
Visual Fields
Optic Nerve Injuries
Injuries to the optic nerve induced by a trauma to the face or head. These may occur with closed or penetrating injuries. Relatively minor compression of the superior aspect of orbit may also result in trauma to the optic nerve. Clinical manifestations may include visual loss, PAPILLEDEMA, and an afferent pupillary defect.
Diabetic Neuropathies
Peripheral, autonomic, and cranial nerve disorders that are associated with DIABETES MELLITUS. These conditions usually result from diabetic microvascular injury involving small blood vessels that supply nerves (VASA NERVORUM). Relatively common conditions which may be associated with diabetic neuropathy include third nerve palsy (see OCULOMOTOR NERVE DISEASES); MONONEUROPATHY; mononeuropathy multiplex; diabetic amyotrophy; a painful POLYNEUROPATHY; autonomic neuropathy; and thoracoabdominal neuropathy. (From Adams et al., Principles of Neurology, 6th ed, p1325)
Mechanoreceptors
Muscle Contraction
Scanning Laser Polarimetry
Purkinje Fibers
Splanchnic Nerves
The major nerves supplying sympathetic innervation to the abdomen. The greater, lesser, and lowest (or smallest) splanchnic nerves are formed by preganglionic fibers from the spinal cord which pass through the paravertebral ganglia and then to the celiac ganglia and plexuses. The lumbar splanchnic nerves carry fibers which pass through the lumbar paravertebral ganglia to the mesenteric and hypogastric ganglia.
Sensory Receptor Cells
Lingual Nerve
Accessory Nerve
The 11th cranial nerve which originates from NEURONS in the MEDULLA and in the CERVICAL SPINAL CORD. It has a cranial root, which joins the VAGUS NERVE (10th cranial) and sends motor fibers to the muscles of the LARYNX, and a spinal root, which sends motor fibers to the TRAPEZIUS and the sternocleidomastoid muscles.
Histocytochemistry
Lasers
An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum.
Afferent Pathways
Rats, Sprague-Dawley
Muscle, Skeletal
Glaucoma, Open-Angle
Vasoactive Intestinal Peptide
Chorda Tympani Nerve
Skin
Oculomotor Nerve
The 3d cranial nerve. The oculomotor nerve sends motor fibers to the levator muscles of the eyelid and to the superior rectus, inferior rectus, and inferior oblique muscles of the eye. It also sends parasympathetic efferents (via the ciliary ganglion) to the muscles controlling pupillary constriction and accommodation. The motor fibers originate in the oculomotor nuclei of the midbrain.
Mossy Fibers, Hippocampal
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.
Retinal Neurons
Thoracic Nerves
Cochlear Nucleus
The brain stem nucleus that receives the central input from the cochlear nerve. The cochlear nucleus is located lateral and dorsolateral to the inferior cerebellar peduncles and is functionally divided into dorsal and ventral parts. It is tonotopically organized, performs the first stage of central auditory processing, and projects (directly or indirectly) to higher auditory areas including the superior olivary nuclei, the medial geniculi, the inferior colliculi, and the auditory cortex.
Schwann Cells
Abducens Nerve
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.
Rats, Wistar
Recurrent Laryngeal Nerve
Branches of the vagus (tenth cranial) nerve. The recurrent laryngeal nerves originate more caudally than the superior laryngeal nerves and follow different paths on the right and left sides. They carry efferents to all muscles of the larynx except the cricothyroid and carry sensory and autonomic fibers to the laryngeal, pharyngeal, tracheal, and cardiac regions.
Facial Nerve Injuries
Traumatic injuries to the facial nerve. This may result in FACIAL PARALYSIS, decreased lacrimation and salivation, and loss of taste sensation in the anterior tongue. The nerve may regenerate and reform its original pattern of innervation, or regenerate aberrantly, resulting in inappropriate lacrimation in response to gustatory stimuli (e.g., "crocodile tears") and other syndromes.
Microscopy, Confocal
Sciatic Neuropathy
Disease or damage involving the SCIATIC NERVE, which divides into the PERONEAL NERVE and TIBIAL NERVE (see also PERONEAL NEUROPATHIES and TIBIAL NEUROPATHY). Clinical manifestations may include SCIATICA or pain localized to the hip, PARESIS or PARALYSIS of posterior thigh muscles and muscles innervated by the peroneal and tibial nerves, and sensory loss involving the lateral and posterior thigh, posterior and lateral leg, and sole of the foot. The sciatic nerve may be affected by trauma; ISCHEMIA; COLLAGEN DISEASES; and other conditions. (From Adams et al., Principles of Neurology, 6th ed, p1363)
Reflex
Tomography
Spinal Cord
Cranial Nerve Neoplasms
Photography
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)
Facial Nerve Diseases
Diseases of the facial nerve or nuclei. Pontine disorders may affect the facial nuclei or nerve fascicle. The nerve may be involved intracranially, along its course through the petrous portion of the temporal bone, or along its extracranial course. Clinical manifestations include facial muscle weakness, loss of taste from the anterior tongue, hyperacusis, and decreased lacrimation.
Parasympathetic Nervous System
The craniosacral division of the autonomic nervous system. The cell bodies of the parasympathetic preganglionic fibers are in brain stem nuclei and in the sacral spinal cord. They synapse in cranial autonomic ganglia or in terminal ganglia near target organs. The parasympathetic nervous system generally acts to conserve resources and restore homeostasis, often with effects reciprocal to the sympathetic nervous system.
Acetylcholinesterase
Autonomic Pathways
Receptors, Nerve Growth Factor
Ocular Hypertension
Hypoglossal Nerve
Ganglia
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).
Macula Lutea
An oval area in the retina, 3 to 5 mm in diameter, usually located temporal to the posterior pole of the eye and slightly below the level of the optic disk. It is characterized by the presence of a yellow pigment diffusely permeating the inner layers, contains the fovea centralis in its center, and provides the best phototropic visual acuity. It is devoid of retinal blood vessels, except in its periphery, and receives nourishment from the choriocapillaris of the choroid. (From Cline et al., Dictionary of Visual Science, 4th ed)
Wallerian Degeneration
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).
Cornea
The transparent anterior portion of the fibrous coat of the eye consisting of five layers: stratified squamous CORNEAL EPITHELIUM; BOWMAN MEMBRANE; CORNEAL STROMA; DESCEMET MEMBRANE; and mesenchymal CORNEAL ENDOTHELIUM. It serves as the first refracting medium of the eye. It is structurally continuous with the SCLERA, avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the TRIGEMINAL NERVE via the ciliary nerves and those of the surrounding conjunctiva which together form plexuses. (Cline et al., Dictionary of Visual Science, 4th ed)
Optic Neuritis
Inflammation of the optic nerve. Commonly associated conditions include autoimmune disorders such as MULTIPLE SCLEROSIS, infections, and granulomatous diseases. Clinical features include retro-orbital pain that is aggravated by eye movement, loss of color vision, and contrast sensitivity that may progress to severe visual loss, an afferent pupillary defect (Marcus-Gunn pupil), and in some instances optic disc hyperemia and swelling. Inflammation may occur in the portion of the nerve within the globe (neuropapillitis or anterior optic neuritis) or the portion behind the globe (retrobulbar neuritis or posterior optic neuritis).
Neuropeptides
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.
Rabbits
Vision Disorders
Visual impairments limiting one or more of the basic functions of the eye: visual acuity, dark adaptation, color vision, or peripheral vision. These may result from EYE DISEASES; OPTIC NERVE DISEASES; VISUAL PATHWAY diseases; OCCIPITAL LOBE diseases; OCULAR MOTILITY DISORDERS; and other conditions (From Newell, Ophthalmology: Principles and Concepts, 7th ed, p132).
Optic Atrophy
Atrophy of the optic disk which may be congenital or acquired. This condition indicates a deficiency in the number of nerve fibers which arise in the RETINA and converge to form the OPTIC DISK; OPTIC NERVE; OPTIC CHIASM; and optic tracts. GLAUCOMA; ISCHEMIA; inflammation, a chronic elevation of intracranial pressure, toxins, optic nerve compression, and inherited conditions (see OPTIC ATROPHIES, HEREDITARY) are relatively common causes of this condition.
Autonomic Fibers, Postganglionic
Guinea Pigs
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.
Efferent Pathways
Maxillary Nerve
Tyrosine 3-Monooxygenase
Sensation
Taste Buds
Cell Count
Ganglia, Autonomic
Clusters of neurons and their processes in the autonomic nervous system. In the autonomic ganglia, the preganglionic fibers from the central nervous system synapse onto the neurons whose axons are the postganglionic fibers innervating target organs. The ganglia also contain intrinsic neurons and supporting cells and preganglionic fibers passing through to other ganglia.
Abducens Nerve Diseases
Diseases of the sixth cranial (abducens) nerve or its nucleus in the pons. The nerve may be injured along its course in the pons, intracranially as it travels along the base of the brain, in the cavernous sinus, or at the level of superior orbital fissure or orbit. Dysfunction of the nerve causes lateral rectus muscle weakness, resulting in horizontal diplopia that is maximal when the affected eye is abducted and ESOTROPIA. Common conditions associated with nerve injury include INTRACRANIAL HYPERTENSION; CRANIOCEREBRAL TRAUMA; ISCHEMIA; and INFRATENTORIAL NEOPLASMS.
Tetrodotoxin
Hindlimb
Axonal Transport
Tongue
Stellate Ganglion
Tonometry, Ocular
Peripheral Nervous System
The nervous system outside of the brain and spinal cord. The peripheral nervous system has autonomic and somatic divisions. The autonomic nervous system includes the enteric, parasympathetic, and sympathetic subdivisions. The somatic nervous system includes the cranial and spinal nerves and their ganglia and the peripheral sensory receptors.
Disease Models, Animal
Visual Acuity
Clarity or sharpness of OCULAR VISION or the ability of the eye to see fine details. Visual acuity depends on the functions of RETINA, neuronal transmission, and the interpretative ability of the brain. Normal visual acuity is expressed as 20/20 indicating that one can see at 20 feet what should normally be seen at that distance. Visual acuity can also be influenced by brightness, color, and contrast.
Parasympathetic Fibers, Postganglionic
Trigeminal Nerve Diseases
Diseases of the trigeminal nerve or its nuclei, which are located in the pons and medulla. The nerve is composed of three divisions: ophthalmic, maxillary, and mandibular, which provide sensory innervation to structures of the face, sinuses, and portions of the cranial vault. The mandibular nerve also innervates muscles of mastication. Clinical features include loss of facial and intra-oral sensation and weakness of jaw closure. Common conditions affecting the nerve include brain stem ischemia, INFRATENTORIAL NEOPLASMS, and TRIGEMINAL NEURALGIA.
Oculomotor Nerve Diseases
Diseases of the oculomotor nerve or nucleus that result in weakness or paralysis of the superior rectus, inferior rectus, medial rectus, inferior oblique, or levator palpebrae muscles, or impaired parasympathetic innervation to the pupil. With a complete oculomotor palsy, the eyelid will be paralyzed, the eye will be in an abducted and inferior position, and the pupil will be markedly dilated. Commonly associated conditions include neoplasms, CRANIOCEREBRAL TRAUMA, ischemia (especially in association with DIABETES MELLITUS), and aneurysmal compression. (From Adams et al., Principles of Neurology, 6th ed, p270)
Neurons
Sympathetic Fibers, Postganglionic
Nerve fibers which project from sympathetic ganglia to synapses on target organs. Sympathetic postganglionic fibers use norepinephrine as transmitter, except for those innervating eccrine sweat glands (and possibly some blood vessels) which use acetylcholine. They may also release peptide cotransmitters.
Nerve Sheath Neoplasms
Receptor, Nerve Growth Factor
Rana pipiens
Optic Chiasm
The X-shaped structure formed by the meeting of the two optic nerves. At the optic chiasm the fibers from the medial part of each retina cross to project to the other side of the brain while the lateral retinal fibers continue on the same side. As a result each half of the brain receives information about the contralateral visual field from both eyes.
Dental Pulp
Neuralgia
Axotomy
Rats, Inbred Strains
Electromyography
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.
Choline O-Acetyltransferase
GAP-43 Protein
A nervous tissue specific protein which is highly expressed in NEURONS during development and NERVE REGENERATION. It has been implicated in neurite outgrowth, long-term potentiation, SIGNAL TRANSDUCTION, and NEUROTRANSMITTER release. (From Neurotoxicology 1994;15(1):41-7) It is also a substrate of PROTEIN KINASE C.
Hyperalgesia
Vestibular Nerve
The vestibular part of the 8th cranial nerve (VESTIBULOCOCHLEAR NERVE). The vestibular nerve fibers arise from neurons of Scarpa's ganglion and project peripherally to vestibular hair cells and centrally to the VESTIBULAR NUCLEI of the BRAIN STEM. These fibers mediate the sense of balance and head position.
Peripheral Nervous System Neoplasms
Electrophysiology
Low Tension Glaucoma
Autonomic Fibers, Preganglionic
NERVE FIBERS which project from the central nervous system to AUTONOMIC GANGLIA. In the sympathetic division most preganglionic fibers originate with neurons in the intermediolateral column of the SPINAL CORD, exit via ventral roots from upper thoracic through lower lumbar segments, and project to the paravertebral ganglia; there they either terminate in SYNAPSES or continue through the SPLANCHNIC NERVES to the prevertebral ganglia. In the parasympathetic division the fibers originate in neurons of the BRAIN STEM and sacral spinal cord. In both divisions the principal transmitter is ACETYLCHOLINE but peptide cotransmitters may also be released.
Myofibrils
Dogs
Pain
Cranial Nerve Injuries
Nervous System Physiological Phenomena
Hypogastric Plexus
Rana esculenta
Muscle Spindles
Skeletal muscle structures that function as the MECHANORECEPTORS responsible for the stretch or myotactic reflex (REFLEX, STRETCH). They are composed of a bundle of encapsulated SKELETAL MUSCLE FIBERS, i.e., the intrafusal fibers (nuclear bag 1 fibers, nuclear bag 2 fibers, and nuclear chain fibers) innervated by SENSORY NEURONS.
Chinchilla
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.
Neuritis
Ganglia, Sympathetic
Reproducibility of Results
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
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)
Ganglia, Sensory
Gonioscopy
Diagnostic Techniques, Obstetrical and Gynecological
Elastic Tissue
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)
Morphogenesis of callosal arbors in the parietal cortex of hamsters. (1/3208)
The morphogenesis of callosal axons originating in the parietal cortex was studied by anterograde labeling with Phaseolus lectin or biocytin injected in postnatal (P) hamsters aged 7-25 days. Some labeled fibers were serially reconstructed. At P7, some callosal fibers extended as far as the contralateral rhinal fissure, with simple arbors located in the homotopic region of the opposite cortical gray matter, and two or three unbranched sprouts along their trajectory. From P7 to P13, the homotopic arbors became more complex, with branches focused predominantly, but not exclusively, in the supra- and infragranular layers of the homotopic region. Simultaneously, the lateral extension of the trunk axon in the white matter became shorter, finally disappearing by P25. Arbors in the gray matter were either bilaminar (layers 2/3 and 5) or supragranular. A heterotopic projection to the lateral cortex was consistently seen at all ages; the heterotopic arbors follow a similar sequence of events to that seen in homotopic regions. These observations document that callosal axons undergo regressive tangential remodeling during the first postnatal month, as the lateral extension of the trunk fiber gets eliminated. Radially, however, significant arborization occurs in layer-specific locations. The protracted period of morphogenesis suggests a correspondingly long plastic period for this system of cortical fibers. (+info)Comparative effects of methylmercury on parallel-fiber and climbing-fiber responses of rat cerebellar slices. (2/3208)
The environmental neurotoxicant methylmercury (MeHg) causes profound disruption of cerebellar function. Previous studies have shown that acute exposure to MeHg impairs synaptic transmission in both the peripheral and central nervous systems. However, the effects of MeHg on cerebellar synaptic function have never been examined. In the present study, effects of acute exposure to MeHg on synaptic transmission between parallel fibers or climbing fibers and Purkinje cells were compared in 300- to 350-microm cerebellar slices by using extracellular and intracellular microelectrode-recording techniques. Field potentials of parallel-fiber volleys (PFVs) and the associated postsynaptic responses (PSRs) were recorded in the molecular layer by stimulating the parallel fibers in transverse cerebellar slices. The climbing-fiber responses were also recorded in the molecular layer by stimulating white matter in sagittal cerebellar slices. At 20, 100, and 500 microM, MeHg reduced the amplitude of both PFVs and the associated PSRs to complete block, however, it blocked PSRs more rapidly than PFVs. MeHg also decreased the amplitudes of climbing-fiber responses to complete block. For all responses, an initial increase in amplitude preceded MeHg-induced suppression. Intracellular recordings of excitatory postsynaptic potentials of Purkinje cells were compared before and after MeHg. At 100 microM and 20 microM, MeHg blocked the Na+-dependent, fast somatic spikes and Ca++-dependent, slow dendritic spike bursts. MeHg also hyperpolarized and then depolarized Purkinje cell membranes, suppressed current conduction from parallel fibers or climbing fibers to dendrites of Purkinje cells, and blocked synaptically activated local responses. MeHg switched the pattern of repetitive firing of Purkinje cells generated spontaneously or by depolarizing current injection at Purkinje cell soma from predominantly Na+-dependent, fast somatic spikes to predominantly Ca++-dependent, low amplitude, slow dendritic spike bursts. Thus, acute exposure to MeHg causes a complex pattern of effects on cerebellar synaptic transmission, with apparent actions on both neuronal excitability and chemical synaptic transmission. (+info)Electrophysiological evidence for tetrodotoxin-resistant sodium channels in slowly conducting dural sensory fibers. (3/3208)
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 (1.5C-fiber depletion alters response properties of neurons in trigeminal nucleus principalis. (4/3208)
The effects of C-fiber depletion induced by neonatal capsaicin treatment on the functional properties of vibrissa-sensitive low-threshold mechanoreceptive (LTM) neurons in the rat trigeminal nucleus principalis were examined in adult rats. Neonatal rats were injected either with capsaicin or its vehicle within 48 h of birth. The depletion of unmyelinated afferents was confirmed by the significant decrease in plasma extravasation of Evan's blue dye induced in the hindlimb skin of capsaicin-treated rats by cutaneous application of mustard oil and by the significant decrease of unmyelinated fibers in both the sciatic and infraorbital nerves. The mechanoreceptive field (RF) and response properties of 31 vibrissa-sensitive neurons in capsaicin-treated rats were compared with those of 32 vibrissa-sensitive neurons in control (untreated or vehicle-treated) rats. The use of electronically controlled mechanical stimuli allowed quantitative analysis of response properties of vibrissa-sensitive neurons; these included the number of center- and surround-RF vibrissae within the RF (i.e., those vibrissae which when stimulated elicited >/=1 and <1 action potential per stimulus, respectively), the response magnitude and latency, and the selectivity of responses to stimulation of vibrissae in different directions with emphasis on combining both the response magnitude and direction of vibrissal deflection in a vector analysis. Neonatal capsaicin treatment was associated with significant increases in the total number of vibrissae, in the number of center-RF vibrissae per neuronal RF, and in the percentage of vibrissa-sensitive neurons that also responded to stimulation of other types of orofacial tissues. Compared with control rats, capsaicin-treated rats showed significant increases in the response magnitude to stimulation of surround-RF vibrissae as well as in response latency variability to stimulation of both center- and surround-RF vibrissae. C-fiber depletion also significantly altered the directional selectivity of responses to stimulation of vibrissae. For neurons with multiple center-RF vibrissae, the proportion of center-RF vibrissae with net vector responses oriented toward the same quadrant was significantly less in capsaicin-treated compared with control rats. These changes in the functional properties of principalis vibrissa-sensitive neurons associated with marked depletion of C-fiber afferents are consistent with similarly induced alterations in LTM neurons studied at other levels of the rodent somatosensory system, and indeed may contribute to alterations previously described in the somatosensory cortex of adult rodents. Furthermore, these results provide additional support to the view that C fibers may have an important role in shaping the functional properties of LTM neurons in central somatosensory pathways. (+info)Uninjured C-fiber nociceptors develop spontaneous activity and alpha-adrenergic sensitivity following L6 spinal nerve ligation in monkey. (5/3208)
We investigated whether uninjured cutaneous C-fiber nociceptors in primates develop abnormal responses after partial denervation of the skin. Partial denervation was induced by tightly ligating spinal nerve L6 that innervates the dorsum of the foot. Using an in vitro skin-nerve preparation, we recorded from uninjured single afferent nerve fibers in the superficial peroneal nerve. Recordings were made from 32 C-fiber nociceptors 2-3 wk after ligation and from 29 C-fiber nociceptors in control animals. Phenylephrine, a selective alpha1-adrenergic agonist, and UK14304 (UK), a selective alpha2-adrenergic agonist, were applied to the receptive field for 5 min in increasing concentrations from 0.1 to 100 microM. Nociceptors from in vitro control experiments were not significantly different from nociceptors recorded by us previously in in vivo experiments. In comparison to in vitro control animals, the afferents found in lesioned animals had 1) a significantly higher incidence of spontaneous activity, 2) a significantly higher incidence of response to phenylephrine, and 3) a higher incidence of response to UK. In lesioned animals, the peak response to phenylephrine was significantly greater than to UK, and the mechanical threshold of phenylephrine-sensitive afferents was significantly lower than for phenylephrine-insensitive afferents. Staining with protein gene product 9.5 revealed an approximately 55% reduction in the number of unmyelinated terminals in the epidermis of the lesioned limb compared with the contralateral limb. Thus uninjured cutaneous C-fiber nociceptors that innervate skin partially denervated by ligation of a spinal nerve acquire two abnormal properties: spontaneous activity and alpha-adrenergic sensitivity. These abnormalities in nociceptor function may contribute to neuropathic pain. (+info)Mechanisms of capsaicin- and lactic acid-induced bronchoconstriction in the newborn dog. (6/3208)
1. Capsaicin activation of the pulmonary C fibre vanilloid receptor (VR1) evokes the pulmonary chemoreflex and reflex bronchoconstriction. Among potential endogenous ligands of C fibre afferents, lactic acid has been suggested as a promising candidate. We tested the hypotheses that (a) lactic acid behaves as a stimulant of C fibre receptors in the newborn dog to cause reflex bronchoconstriction, and (b) lactic acid causes reflex bronchoconstriction via the same pulmonary C fibre receptor mechanism as capsaicin using the competitive capsaicin/VR1 receptor antagonist capsazepine. 2. Right heart injection of lactic acid caused a significant increase (47 +/- 8.0 %) in lung resistance (RL) that was atropine sensitive (reduced by 75 %; P < 0.05), consistent with reflex activation of muscarinic efferents by stimulation of C fibre afferents. 3. Infusion of the competitive capsaicin antagonist capsazepine caused an 80 % reduction (P < 0.01) in the control bronchoconstrictor response (41 +/- 8.5 % increase in RL) to right heart injections of capsaicin. The effects of capsazepine are consistent with reversible blockade of the VR1 receptor to abolish C fibre-mediated reflex bronchoconstriction. 4. Lactic acid-evoked increases in RL were unaffected by VR1 blockade with capsazepine, consistent with a separate lactic acid-induced reflex mechanism. 5. We conclude that (a) putative stimulation of C fibres with lactic acid causes reflex bronchoconstriction in the newborn dog, (b) capsazepine reversibly antagonizes reflex bronchoconstriction elicited by right heart injection of capsaicin, presumably by attenuating capsaicin-induced activation of the C fibre 'capsaicin' receptor (VR1), and (c) capsazepine resistance of lactic acid-induced bronchoconstriction indicates that lactic acid evokes reflex bronchoconstriction by a separate mechanism, possibly via the acid-sensing ionic channel. (+info)The size and fibre composition of the corpus callosum with respect to gender and schizophrenia: a post-mortem study. (7/3208)
In this study the cross-sectional area (in n = 14 female controls, 15 male controls, 11 female patients with schizophrenia, 15 male patients with schizophrenia) and fibre composition (in n = 11 female controls, 10 male controls, 10 female patients with schizophrenia, 10 male patients with schizophrenia) of the corpus callosum in post-mortem control and schizophrenic brains was examined. A gender x diagnosis interaction (P = 0.005) was seen in the density of axons in all regions of the corpus callosum except the posterior midbody and splenium. Amongst controls, females had greater density than males; in patients with schizophrenia this difference was reversed. A reduction in the total number of fibres in all regions of the corpus callosum except the rostrum was observed in female schizophrenic patients (P = 0.006; when controlling for brain weight, P = 0.053). A trend towards a reduced cross-sectional area of the corpus callosum was seen in schizophrenia (P = 0.098); however, this is likely to be no more than a reflection of an overall reduction in brain size. With age, all subregions of the corpus callosum except the rostrum showed a significant reduction in cross-sectional area (P = 0.018) and total fibre number (P = 0.002). These findings suggest that in schizophrenia there is a subtle and gender-dependent alteration in the forebrain commissures that may relate to the deviations in asymmetry seen in other studies, but the precise anatomical explanation remains obscure. (+info)A glial cell line-derived neurotrophic factor-secreting clone of the Schwann cell line SCTM41 enhances survival and fiber outgrowth from embryonic nigral neurons grafted to the striatum and to the lesioned substantia nigra. (8/3208)
We have developed a novel Schwann cell line, SCTM41, derived from postnatal sciatic nerve cultures and have stably transfected a clone with a rat glial cell line-derived neurotrophic factor (GDNF) construct. Coculture with this GDNF-secreting clone enhances in vitro survival and fiber growth of embryonic dopaminergic neurons. In the rat unilateral 6-OHDA lesion model of Parkinson's disease, we have therefore made cografts of these cells with embryonic day 14 ventral mesencephalic grafts and assayed for effects on dopaminergic cell survival and process outgrowth. We show that cografts of GDNF-secreting Schwann cell lines improve the survival of intrastriatal embryonic dopaminergic neuronal grafts and improve neurite outgrowth into the host neuropil but have no additional effect on amphetamine-induced rotation. We next looked to see whether bridge grafts of GDNF-secreting SCTM41 cells would promote the growth of axons to their striatal targets from dopaminergic neurons implanted orthotopically into the 6-OHDA-lesioned substantia nigra. We show that such bridge grafts increase the survival of implanted embryonic dopaminergic neurons and promote the growth of axons through the grafts to the striatum. (+info)
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Tension 1949
Node of Ranvier
Myelination of nerve fibers[edit]. The complex changes that the Schwann cell undergoes during the process of myelination of ... Soon afterwards, he discovered gaps in sheaths of nerve fibers, which were later called the Nodes of Ranvier. This discovery ... His refined histological techniques and his work on both injured and normal nerve fibers became world-renowned. His ... Nerve conduction in myelinated axons is referred to as saltatory conduction (from the Latin saltare "to hop or to leap") due to ...
Herbert Spencer Gasser
Nerve fiber analysis. Awards. Nobel Prize for Physiology or Medicine (1944). Foreign Member of the Royal Society (ForMemRS) ( ... and recipient of the Nobel Prize for Physiology or Medicine in 1944 for his work with action potentials in nerve fibers while ... summarizing their investigations into the actions of human nerve cells. This work led to their recognition in 1944, when they ... Gasser in 1944 for the discovery of high differentiation of the functions of various nerve fibres". Wiadomosci lekarskie ( ...
Retina
Nerve fiber layer (NFL) Ganglion cell axons travelling towards the optic nerve ... Inner half) Henle's nerve fiber layer (HL) Photoreceptor axons (obliquely orientated fibres; not present in mid-peripheral or ... Sherman, J (June 2009). "Photoreceptor integrity line joins the nerve fiber layer as key to clinical diagnosis". Optometry. 80 ... It has three layers of nerve cells and two of synapses, including the unique ribbon synapse. The optic nerve carries the ...
Motor unit recruitment
Spatial distribution of muscle fibers within the territory of a motor unit. Muscle and Nerve 13:1133-1145, 1990. - non-random ... depending on the number of fibers and size of the muscle.[1][2] When a motor neuron is activated, all of the muscle fibers ... A motor unit consists of one motor neuron and all of the muscle fibers it stimulates. All muscles consist of a number of motor ... units and the fibers belonging to a motor unit are dispersed and intermingle amongst fibers of other units. The muscle fibers ...
Neuropathic pain
Capsaicin causes reversible degeneration of epidermal nerve fibers.[48] Notably the capsaicin used for the relief of ... parallel loss of epidermal nerve fibers and pain sensation". Pain. 81 (1-2): 135-45. doi:10.1016/S0304-3959(99)00007-X. PMID ... They named this type of pain specifically as "vaja al asab" [nerve originated pain], described its numbness, tingling and ... Galen also suggested nerve tissue as the transferring route of pain to the brain through the invisible psychic pneuma.[56] The ...
Cup-to-disc ratio
The pink rim of disc contains nerve fibers. The white cup is a pit with no nerve fibers. As glaucoma advances, the cup enlarges ... "Glaucoma causes Optic Nerve Cupping (atrophy) and Vision Loss". The Eye Digest. The University of Illinois Eye and Ear ... The optic disc is the anatomical location of the eye's "blind spot", the area where the optic nerve and blood vessels enter the ...
Temporal bone
This area contains nerve fibers, called glomus bodies. Normally, these nerves respond to changes in body temperature or blood ... Horizontal fractures were thought to be associated with injuries to the facial nerve, and longitudinal with injuries to the ... The lower seven cranial nerves and the major vessels to and from the brain traverse the temporal bone. ... This tumor can affect the ear, upper neck, base of the skull, and the surrounding blood vessels and nerves. ...
Sweat gland
Small fiber peripheral neuropathy can damage the nerves that control the sweat glands. The sweat gland nerve fiber density test ... Each sweat gland receives several nerve fibers that branch out into bands of one or more axons and encircle the individual ... If the auriculotemporal nerve is damaged (most often as a result of a Parotidectomy), excess sweat can be produced in the rear ... or nerve inflammation.[64] Hyperhidrosis can also be caused by trench foot or encephalitis.[64]. Milaria rubra. Also called ...
Biological neuron model
Johnson, Don H.; Swami, Ananthram (1983-08-01). "The transmission of signals by auditory‐nerve fiber discharge patterns". The ... Taberner, Annette M.; Liberman, M. Charles (2005-01-01). "Response Properties of Single Auditory Nerve Fibers in the Mouse". ... "Analysis of discharges recorded simultaneously from pairs of auditory nerve fibers". Biophysical Journal. 16 (7): 719-734. ... Müller, Marcus; Robertson, Donald; Yates, Graeme K. (1991-09-01). "Rate-versus-level functions of primary auditory nerve fibres ...
Achilles tendinitis
With the blood vessels come nerve fibers. Researchers including Alfredson and his team in Sweden believe these nerve fibers to ... This lack of blood supply can lead to the degradation of collagen fibers and inflammation. Tightness in the calf muscles has ... important for individuals with chronic Achilles tendinosis which is classified as the degeneration of collagen fibers. These ...
Action potential
"Electro-saltatory transmission of nerve impulse and effect of narcosis upon nerve fiber". Am. J. Physiol. 127: 211-27. doi: ... Hursh JB (1939). "Conduction velocity and diameter of nerve fibers". American Journal of Physiology. 127: 131-39. doi:10.1152/ ... Note that these Purkinje fibers are muscle fibers and not related to the Purkinje cells, which are neurons found in the ... "Direct determination of membrane resting potential and action potential in single myelinated nerve fibers". The Journal of ...
Visual impairment due to intracranial pressure
Radial nerve fiber layer (NFL) without NFL tortuosity. Rare obscuration of a major blood vessel, usually on the upper pole. ... Disruption of the normal radial NFL arrangement with grayish opacity accentuating nerve fiber layer bundles. Normal temporal ... Movaffaghy, A.; Chamot, S.R.; Petrig, B.L.; Riva, C.E. (1998). "Blood Flow in the Human Optic Nerve Head during Isometric ... Stage 4 - Marked Optic-disc Edema Elevation of the entire nerve head. Obscuration of all borders. Peripapillary halo. Total ...
Ichiji Tasaki
Tasaki, I (1954). "Nerve impulses in individual auditory nerve fibers of guinea pig". Journal of Neurophysiology. 17 (2): 97- ... Tasaki, I. The electro-saltatory transmission of the nerve impulse and the effect of narcosis upon the nerve fiber. Am J ... While in Japan, he studied vertebrate nerve fibers and discovered the insulating function of the myelin sheath, a material that ... Tasaki, I (1999). "Rapid structural changes in nerve fibers and cells associated with their excitation processes". The Japanese ...
Urethral sphincters
It is controlled by the deep perineal branch of the pudendal nerve. Activity in the nerve fibers constricts the urethra. The ... The urethrovaginal muscle fibers wrap around the vagina and urethra and contraction leads to constriction of both the vagina ... Weak pelvic floor muscles, intrinsic sphincter damage, or damage to the surrounding nerves and tissue can make the urethral ... The external urethral sphincter originates at the ischiopubic ramus and inserts into the intermeshing muscle fibers from the ...
Cancer pain
... the thin protective layer around the nerve fiber, the basal lamina, is preserved so that, as a damaged fiber regrows, it ... Surgically cutting a nerve severs these basal lamina tubes, and without them to channel the regrowing fibers to their lost ... Because nerves often carry both sensory and motor fibers, motor impairment is a possible side effect of neurectomy. A common ... Cordotomy involves cutting nerve fibers that run up the front/side (anterolateral) quadrant of the spinal cord, carrying heat ...
Chiropractic
"Physiologists divide nerve-fibers, which form the nerves, into two classes, afferent and efferent. Impressions are made on the ... Thus, nerves carry impulses outward and sensations inward. The activity of these nerves, or rather their fibers, may become ... Efferent nerve-fibers carry impulses out from the center to their endings. Most of these go to muscles and are therefore called ... that vertebral subluxations caused pinched nerves in the intervertebral spaces in favor of subluxations causing altered nerve ...
Ageing
Marner, Lisbeth; Nyengaard, Jens R.; Tang, Yong; Pakkenberg, Bente (2003). "Marked loss of myelinated nerve fibers in the human ... "The Effects of Normal Aging on Nerve Fibers and Neuroglia in the Central Nervous System". In Riddle, David R. (ed.). Brain ...
Sexual dimorphism
Marner L, Nyengaard JR, Tang Y, Pakkenberg B (July 2003). "Marked loss of myelinated nerve fibers in the human brain with age ...
Sweat gland
Small fiber peripheral neuropathy can damage the nerves that control the sweat glands. The sweat gland nerve fiber density test ... Each sweat gland receives several nerve fibers that branch out into bands of one or more axons and encircle the individual ... "Sweat Gland Nerve Fiber Density". Therapath. Eroschenko, Victor P. (2008). "Integumentary System". DiFiore's Atlas of Histology ... Frey's Syndrome If the auriculotemporal nerve is damaged (most often as a result of a Parotidectomy), excess sweat can be ...
Atlantic horseshoe crab
Each ommatidium feeds into a single nerve fiber. Furthermore, the nerves are large and relatively accessible. This made it ...
Herbert Gasser - Simple English Wikipedia, the free encyclopedia
Nerve fiber analysis. Awards. Nobel Prize for Physiology or Medicine (1944). Foreign Member of the Royal Society (ForMemRS) ( ... Gasser discovered the different conductivity rates of different groups of nerve fibres. The work led to advances in our ... "for their discoveries relating to the highly differentiated functions of single nerve fibres" which probably means 'different ...
C tactile afferent
CT neurons belong to a group C nerve fibers; these are unmyelinated, and have slow conduction velocities. CT afferents were ... Nagi, Saad S.; Mahns, David A. (May 2013). "C-tactile Fibers Contribute to Cutaneous Allodynia After Eccentric Exercise". The ... Djouhri, Laiche (2016-02-02). "Electrophysiological evidence for the existence of a rare population of C-fiber low threshold ... "Transcriptional Profiling of Cutaneous MRGPRD Free Nerve Endings and C-LTMRs". Cell Reports. 10 (6): 1007-1019. doi:10.1016/j. ...
Geniculate ganglion
It receives fibers from the motor, sensory, and parasympathetic components of the facial nerve and sends fibers that will ... The motor fibers of the facial nerve proper and parasympathetic fibers to the submandibular and pterygopalatine ganglia do not ... Motor fibers are carried via the facial nerve proper. The greater petrosal nerve, which carries preganglionic parasympathetic ... The afferent fibers carrying pain, temperature, and touch from the posterior auricular nerve, as well as those carrying special ...
Nicholas J. Wade
PMID 16345004 Vision and the dimensions of nerve fibers. Wade NJ. J Hist Neurosci. 2005 Dec;14(4):281-94. doi: 10.1080/ ... Part 1: Nerve cell structure, vitalism, and the nerve impulse. Finger S, Wade NJ. J Hist Neurosci. 2002 Jun;11(2):136-55. doi: ... PMID 15460513 Cover picture of 2004: partial decussation of the optic nerves. Wade NJ. J Hist Neurosci. 2004 Mar;13(1):125-6. ...
Neurilemma
... serves a protective function for peripheral nerve fibers. Damaged nerve fibers may regenerate if the cell body is ... It forms the outermost layer of the nerve fiber in the peripheral nervous system. The neurilemma is underlain by the myelin ...
Neuroanatomy
Autonomic nerves, unlike somatic nerves, contain only efferent fibers. Sensory signals coming from the viscera course into the ... The peripheral nervous system also contains afferent or efferent nerves, which are bundles of fibers that originate from the ... Nerves are made primarily of the axons or dendrites of neurons (axons in case of efferent motor fibres, and dendrites in case ... Neher, A (2009). "Christopher Wren, Thomas Willis and the Depiction of the Brain and Nerves". Journal of Medical Humanities. 30 ...
Interthalamic adhesion
The interthalamic adhesion contains nerve cells and nerve fibers; a few of the latter may cross the middle line, but most of ... It is still uncertain whether the interthalamic adhesion contains fibers that cross the midline - and for this reason, it is ...
Radiosensitivity
The least sensitive are nerve cells and muscle fibers. Very sensitive cells are also oocytes and lymphocytes, although they are ...
Pupillary light reflex
The afferent limb has nerve fibers running within the optic nerve (CN II). Each efferent limb has nerve fibers running along ... Segments 1 and 2 each includes both the retina and the optic nerve (cranial Nerve #2). Segments 3 and 4 are nerve fibers that ... Postganglionic nerve fibers leave the ciliary ganglion to innervate the ciliary sphincter.[2] Each afferent limb has two ... "Cranial Nerve III-Oculomotor Nerve". yale.edu. Archived from the original on 2009-02-03. Retrieved 2008-07-27.. ...
Type 2 diabetes
"Should Viscous Fiber Supplements Be Considered in Diabetes Control? Results From a Systematic Review and Meta-analysis of ... Viscous fiber supplements may be useful in those with diabetes.[99] ... A 2019 review found evidence of benefit from dietary fiber.[78] ... Nerves. *Retina. *Heart. *Diabetic skin disease *Diabetic ...
Muscle atrophy
Neurogenic atrophy, which has a similar effect, is muscle atrophy resulting from damage to the nerve which stimulates the ... which help to regenerate skeletal muscle fibers, and a decrease in sensitivity to or the availability of critical secreted ...
Substance P
... and other sensory neuropeptides can be released from the peripheral terminals of sensory nerve fibers in the skin, ... Substance P and other sensory neuropeptides can be released from the peripheral terminals of sensory nerve fibers in the skin, ... with an amidation at the C-terminus.[4] Substance P is released from the terminals of specific sensory nerves. It is found in ... When the innervation to substance P nerve terminals is lost, post-synaptic cells compensate for the loss of adequate ...
Sunao Tawara
... containing nerve fibers, connecting the auricles with the ventricles of the heart. The Node of Tawara is also called the ... Node of Tawara: a remnant of primitive fibers found in all mammalian hearts at the base of the interauricular septum, and ...
Hyperalgesia
Stimulation of nociceptive fibers in a pattern consistent with that from inflammation switches on a form of amplification in ... The use of a transcutaneous electrical nerve stimulation device has been shown to alleviate hyperalgesia.[28][29] ... Hyperalgesia is similar to other sorts of pain associated with nerve irritation or damage such as allodynia and neuropathic ... in rats after spinal nerve injury and inflammation". Eur. J. Pharmacol. 510 (3): 223-8. doi:10.1016/j.ejphar.2005.01.033. PMID ...
Photoreceptor cell
No photoreceptors are found at the blind spot, the area where ganglion cell fibers are collected into the optic nerve and leave ... The axons of ganglion cells form the two optic nerves. Photoreceptor cells are typically arranged in an irregular but ... When light activates the melanopsin signaling system, the melanopsin-containing ganglion cells discharge nerve impulses that ... resting potential in other nerve cells is usually −65 mV). This depolarization current is often known as dark current. ...
Category:Mid-importance Anatomy articles
Talk:Accessory obturator nerve. *Talk:Accessory spleen. *Talk:Accessory visual structures. *Talk:Accompanying artery of ... Talk:Association fiber. *Talk:Astrocyte. *Talk:Atlanto-axial joint. *Talk:Atlanto-occipital joint ...
Connective tissue
Types of fibers: Tissue. Purpose. Components. Location Collagenous fibers. Bind bones and other tissues to each other. Alpha ... Connective tissue neoplasms including sarcomas such as hemangiopericytoma and malignant peripheral nerve sheath tumor in ... All connective tissue consists of three main components: fibers (elastic and collagenous fibers),[1] ground substance and cells ... Fibers. Not all types of CT are fibrous. Examples of non-fibrous CT include adipose tissue and blood. Adipose tissue gives " ...
ادرار کردن - ویکیپدیا، دانشنامهٔ آزاد
Fibers in the pelvic nerves constitute the main afferent limb of the voiding reflex; the parasympathetic fibers to the bladder ... is innervated by sympathetic nervous system fibers from the lumbar spinal cord and parasympathetic fibers from the sacral ... When the afferent and efferent nerves are both destroyed, as they may be by tumors of the cauda equina or filum terminale, the ... The state of the reflex system is dependent on both a conscious signal from the brain and the firing rate of sensory fibers ...
Muscle spindle
Efferent nerve fibers of gamma motoneurons also terminate in muscle spindles; they make synapses at either or both of the ends ... dynamic nuclear bag fibers (bag1 fibers), static nuclear bag fibers (bag2 fibers), and nuclear chain fibers.[1][2] ... They convey length information to the central nervous system via afferent nerve fibers. This information can be processed by ... Muscle spindles are found within the belly of muscles, between extrafusal muscle fibers.[b] The specialised fibers that ...
MEMS magnetic field sensor
Optical fibers were aligned on the silicon substrate with different arrangements for the displacement sensing. A resolution 10 ... When we breathe, the nerves and muscles of our thoracic cavity create a weak magnetic field. Magnetometers based on ...
Theodore Holmes Bullock
... and he studied nerve nets in coelenterates and the structure and physiology of giant nerve fibers in annelids. His studies on ... At the age of 88 Bullock re-established a modeling study on nerve-nets, and built a model that accurately predicted the input- ... nerve nets lead him to be one of the first experimentalists to understand the value and importance of computational techniques ...
Neuroscience of music
"Phase Locking of Auditory-Nerve Fibers to the Envelopes of High-Frequency Sounds: Implications for Sound Localization". Journal ... Phase-locking to stimulus frequencies has been shown in the auditory nerve,[5][6] the cochlear nucleus,[5][7] the inferior ... The auditory nerve then leads to several layers of synapses at numerous nuclei in the auditory brainstem. These nuclei are also ... The hair cells in the cochlea release neurotransmitter as a result, causing action potentials down the auditory nerve. ...
Mechanoreceptor
They are all innervated by Aβ fibers, except the mechanorecepting free nerve endings, which are innervated by Aδ fibers. ... Each muscle spindle consists of sensory nerve endings wrapped around special muscle fibers called spindle fibers (also called ... The Merkel nerve endings (also known as Merkel discs) detect sustained pressure. The lamellar corpuscles (also known as ... Mechanosensory free nerve endings detect touch, pressure, stretching, as well as the tickle and itch sensations. Itch ...
Schizophrenia - Simple English Wikipedia, the free encyclopedia
... the band of nerve fibers which connects the left side and the right side of the brain. People with schizophrenia also tend to ...
Olfactory system
... and nerve fibers of the olfactory nerves.[1] Odor molecules can enter the peripheral pathway and reach the nasal cavity either ... Olfactory nerve fibers, which originate in the epithelium, pass through the cribriform plate, connecting the epithelium to the ... Olfactory nerves and fibers transmit information about odors from the peripheral olfactory system to the central olfactory ... causing an electrical response that spreads through the sensory neuron to the olfactory nerve fibers at the back of the nasal ...
Biomarker
Due to the extended length of axonal fiber tracks, axons are particularly vulnerable to physical trauma to the brain. Thus, ... These include dendritic protein microtubule-associated protein-2 (MAP-2) [137,138], brain-derived nerve growth factor (BDNF) [ ...
Schlemm's canal
Nerve fiber layer. *Ganglion cell layer. *Inner plexiform layer. *Inner nuclear layer ...
Outline of brain mapping
Nerve fibers are the result of cell processes and the outgrowths of nerve cells. (Several axons are bound together to form one ... Several nerve fibrils then form one large nerve fiber. Myelin, an electrical insulator, forms around selected axons. ... It allows noninvasive imaging of white matter fiber structure and in addition to mapping can be useful in clinical observations ... Fractional anisotropy a measure often used in diffusion imaging where it is thought to reflect fiber density, axonal diameter, ...
Sensory processing sensitivity
... there is a higher permeability for incoming signals from afferent nerve fibers so that they pass "unfiltered" to the cerebral ...
Adrenal medulla
... and preganglionic autonomic nerve fibers lead to them directly from the central nervous system. The adrenal medulla affects ... Ganglioneuroma, a tumor in the nerve cells of the peripheral nervous system[5] ... Release of catecholamines is stimulated by nerve impulses, and receptors for catecholamines are widely distributed throughout ... receiving innervation from corresponding preganglionic fibers. The cells form clusters around fenestrated capillaries where ...
Talk:Mind-body dualism
The brain has ganglia and nerve fibers, has neuroglia and vessels, has different colors (is colored this way or that) and so on ... The light from a star travels over intervening space and causes a disturbance in the optic nerve ending in an occurrence in the ...
അന്ധബിന്ദു - വിക്കിപീഡിയ
In vertebrates, 1 represents the retina and 2 is the nerve fibers, including the optic nerve (3), whereas in the octopus eye, 1 ... നേത്രനാഡി (optic nerve) ദൃഷ്ടിപടലത്തിലേക്കു കടക്കുന്ന ഭാഗത്തെയാണ് അന്ധബിന്ധു (Blind spot ) എന്ന് പറയുന്നത് . പ്രകാശത്തെ ...
Glossary of biology
When a nerve or muscle cell is at "rest", its membrane potential is called the resting membrane potential. In a typical neuron ... A neuron whose cell body is situated in the motor cortex, brain stem, or the spinal cord, and whose axon (fiber) projects to ... A short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the ... Conducted or conducting outwards or away from something (for nerves, the central nervous system; for blood vessels, the organ ...
Oligodendrocyte
The optimal ratio of axon diameter divided by the total fiber diameter (which includes the myelin) is 0.6.[20] ... Oligodendrocytes interact closely with nerve cells and provide trophic support by the production of glial cell line-derived ... Oligodendrocytes form the electrical insulation around the axons of CNS nerve cells. ...
Tachycardia
... both by the direct action of sympathetic nerve fibers on the heart and by causing the endocrine system to release hormones such ...
Human digestive system
The taste buds are innervated by a branch of the facial nerve the chorda tympani, and the glossopharyngeal nerve. Taste ... 194: Sensory Nerves, Brendan J. Canning, Domenico Spina. Springer. Page 341. *^ Costa, M; Brookes, S J H; Hennig, G W (2000). " ... The pharynx is innervated by the pharyngeal plexus of the vagus nerve.[10]:1465 Muscles in the pharynx push the food into the ... Parasympathetic innervation to the ascending colon is supplied by the vagus nerve. Sympathetic innervation is supplied by the ...
Progressive supranuclear palsy
"Astrocytic plaques and tufts of abnormal fibers do not coexist in corticobasal degeneration and progressive supranuclear palsy ... Brain and Nerve (in Japanese). 41 (1): 35-44. PMID 2655673.. ...
Rectus abdominis muscle
Nerve supply[edit]. The muscles are innervated by thoraco-abdominal nerves, these are continuations of the T7-T11 intercostal ... Some fibers are occasionally connected with the costoxiphoid ligaments, and the side of the xiphoid process. ... Nerve. segmentally by thoraco-abdominal nerves (T7 to T11) and subcostal (T12). ... Sensory supply is from the 7-12 thoracic nerves. Variation[edit]. The sternalis muscle may be a variant form of the pectoralis ...
Group C nerve fiber - Wikipedia
C fibers are one class of nerve fiber found in the nerves of the somatic sensory system.[1] They are afferent fibers, conveying ... Group C nerve fibers are one of three classes of nerve fiber in the central nervous system (CNS) and peripheral nervous system ... Group C fibers include postganglionic fibers in the autonomic nervous system (ANS), and nerve fibers at the dorsal roots (IV ... After a nerve lesion of either C fibers or Aδ fibers, they become abnormally sensitive and cause pathological spontaneous ...
Nerve fibers in the human organ of Corti. - PubMed - NCBI
Nerve fibers in the human organ of Corti.. Nomura Y.. Abstract. In the human cochlea, the following characteristics of nerve ... 7. The nerve fibers were found in the organ of Corti lateral to the external spiral bundles. The fibers were running in the ... the number of nerve fibers in the external spiral bundle was small. 2. In the tunnel of Corti, the basilar fibers (afferent) ... 3. The medial fibers were present with the internal spiral bundle and tunnel spiral bundle. These fibers are possibly efferent ...
Nerve fiber decussation
... Albertino Bigiani bigiani at c220.unimo.it Thu Mar 21 16:06:35 EST 1996 *Previous message: OPCA: ... Hi! Does anybody know why so many nerve fiber bundles decussate in CNS? I mean, is there any functional reason for that? ... Wouldnt be the same if nerve fiber bundles just travelled through the CNS without crossing the middle line? Thanks in advance ...
L3a Nerve Fiber Clinicals Part 2
L3a_Nerve Fiber Clinicals_Part 2 I have been using this material for 7 years in Neuroscience classes in Medical Schools in 3 ... L3a_Nerve Fiber Clinicals_Part 2 is categorized in the following disciplines: * Academic Support Services/EPortfolios/Learning- ... You just viewed L3a_Nerve Fiber Clinicals_Part 2. Please take a moment to rate this material. ... Peripheral nerve Injury, Dean, Surgical Mx principles of PNI, AIMU, Neuroscience, Seddon classification, Neurotmesis ...
This Chemical Is So Hot It Destroys Nerve Fibers-in a Good Way | WIRED
"You give it once and it should last for an extended period of time because it is destroying the fibers," says Mannes. "But the ... When RTX binds to TRPV1, it props open the nerve cells ion channel, letting a whole lot of calcium in. Thats toxic, leading ... "So you gain selectivity because it only acts on TRPV1, which is only on a certain class of fibers, which only transmit pain," ... Inject RTX, as its known, into an aching joint, and itll actually destroy the nerve endings that signal pain. Which means ...
Acetylcholinesterase activity in the efferent nerve fibers of the human inner ear. - PubMed - NCBI
A-beta nerve fibers - definition of A-beta nerve fibers by The Free Dictionary
A-beta nerve fibers synonyms, A-beta nerve fibers pronunciation, A-beta nerve fibers translation, English dictionary definition ... of A-beta nerve fibers. n. 1. A slender, elongated, threadlike object or structure. 2. Botany One of the elongated, thick- ... Related to A-beta nerve fibers: afferent nerve fibers, C nerve fibers ... لِيْف vlákno fiber Faser ίνα fibra kuitu fibre vlakno fibra 繊維 섬유 vezel fiber włókno fibra волокно fiber เส้นใย lif sợi 纤维. fi· ...
Noninvasive Evaluation of Nerve Conduction in Small Diameter Fibers in the Rat
Noninvasive Evaluation of Nerve Conduction in Small Diameter Fibers in the Rat
... Elena G. Zotova1 and Joseph C. Arezzo1,2 ... and C fibers in parallel with the evaluation of fast nerve conduction. ... This method reliably identifies compound action potentials in thinly myelinated fibers conducting at a range of 9-18 m/s (. ... The technique is based on the extraction of rectified multiple unit activity (MUA) from in vivo whole nerve compound responses ...
Nerve Fibers and Terminals: Electron Microscopy after Nauta Staining | Science
Nerve Fibers and Terminals: Electron Microscopy after Nauta Staining Message Subject. (Your Name) has forwarded a page to you ... Sections of cat spinal cord and rat mammillary body in which degenerating nerve fibers were stained by the Nauta silver method ... Silver granules were present in the axoplasm of some myelinated fibers and in some of the axon terminals. ...
Cool Videos: Regenerating Nerve Fibers | Bioethics Research Library
... to track a nerve fiber spreading through the skin of a zebrafish tail fin (gray). The nerve regeneration was occurring in ... The researcher started out by using a laser to sever nerves in a zebrafishs original tail fin, assuming that the nerves would ... Along with other tools, Rieger is using such imaging to explore how the processes of nerve regeneration and wound healing are ... the nerves regenerated. Rieger suspects the answer to the differing outcomes lies in the fact that the fishs damaged skin ...
A Role for Nociceptive, Myelinated Nerve Fibers in Itch Sensation | Journal of Neuroscience
Conduction in myelinated nerve fibers was blocked by the application of local pressure to the superficial radial nerve. The ... Afferent fibers were first identified by electrical stimulation of the nerve trunk. Single fiber activity was then determined ... A prevailing view is that peripheral nerve fibers mediating burning are C-fibers and those mediating pricking/stinging are Aδ- ... A Role for Nociceptive, Myelinated Nerve Fibers in Itch Sensation. Matthias Ringkamp, Raf J. Schepers, Steven G. Shimada, Lisa ...
Nerve Fiber Analysis - definition of Nerve Fiber Analysis by The Free Dictionary
Nerve Fiber Analysis synonyms, Nerve Fiber Analysis pronunciation, Nerve Fiber Analysis translation, English dictionary ... definition of Nerve Fiber Analysis. abbreviation for 1. National Futures Association 2. no fixed abode ... Nerve Fiber Analysis - definition of Nerve Fiber Analysis by The Free Dictionary https://www.thefreedictionary.com/Nerve+Fiber+ ... Related to Nerve Fiber Analysis: Nerve fiber layer NFA. abbreviation for 1. (Stock Exchange) (in the US) National Futures ...
Medical Xpress - nerve fibers
An axon or nerve fiber is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from ... a vital insulating sheath composed of lipids and proteins around nerve fibers helps speed the electrical signals or nerve ... An experiment conducted on rats demonstrates that a course of therapy combining the stimulation of nerve fiber growth with ... In our visual system, the optic nerves normally combine at a place called the optic chiasm. ... ...
The Relationship Among Pain, Sensory Loss, and Small Nerve Fibers in Diabetes | Diabetes Care
We examined intraepidermal nerve fibers (IENFs) to evaluate the role of small nerve fibers in the genesis of neuropathic pain. ... The Relationship Among Pain, Sensory Loss, and Small Nerve Fibers in Diabetes. Lea Sorensen, Lynda Molyneaux, Dennis K. Yue ... It is known that pain transmission in peripheral nerves occurs along the small Aδ and C-type fibers (5,6). However, ... Sorensen L, Molyneaux L, Yue DK: The level of small nerve fiber dysfunction does not predict pain in diabetic neuropathy. Clin ...
Threshold Distributions of Phrenic Nerve Motor Fibers: A Factor in Smooth Electrophrenic Respiration | SpringerLink
Key Advance Reported in Regenerating Nerve Fibers
Researchers have advanced an old quest to get injured nerves to regenerate. By combining two strategies they achieved about ... Normally, injured nerve fibers, known as axons, cant regenerate. Axons conduct impulses away from the body of the nerve cell, ... Key Advance Reported in Regenerating Nerve Fibers. Researchers have advanced a decades-old quest to get injured nerves to ... "But then we come to another big hurdle." That hurdle is getting the nerve fibers from the eye to hook up to the correct centers ...
Neuron-integrated nanotubes to repair nerve fibers
A new study sheds light on the properties of nanostructures capable of ensuring an effective integration with nerve cells, an ... Neuron-integrated nanotubes to repair nerve fibers. (Nanowerk News) Carbon nanotubes exhibit interesting characteristics ... This result, which shows the extent to which the integration between nerve cells and these synthetic structures is stable and ... The research has also highlighted the fact that the nerve cells growing on the substratum of nanotubes, thanks to this ...
Intraepidermal nerve fiber density (IENFD): uses & side-effects | PatientsLikeMe
Temperature dependence of gating current in myelinated nerve fibers | SpringerLink
Asymmetrical displacement currents and Na currents of single myelinated nerve fibers ofXenopus laevis were studied in the ... Asymmetrical displacement currents and Na currents of single myelinated nerve fibers ofXenopus laevis were studied in the ... Temperature dependence of gating current in myelinated nerve fibers. *Peter Jonas1 ... Anomalous temperature dependence of the sodium conductance in rabbit nerve compared with frog nerve.Nature (London) 279:327-328 ...
Demonstration of axonal flow by the movement of tritium-labeled protein in mature optic nerve fibers | PNAS
Demonstration of axonal flow by the movement of tritium-labeled protein in mature optic nerve fibers. A C Taylor and P Weiss ... Demonstration of axonal flow by the movement of tritium-labeled protein in mature optic nerve fibers ... Demonstration of axonal flow by the movement of tritium-labeled protein in mature optic nerve fibers ... Demonstration of axonal flow by the movement of tritium-labeled protein in mature optic nerve fibers ...
Endometrial Nerve Fibers Detection in Patients With Different Gynecological Pathologies - Full Text View - ClinicalTrials.gov
Prevelencce of endometrial nerve fibers [ Time Frame: 18 months ]. Is to determine the prevelence of endometrial nerve fibers ... Endometrial Nerve Fibers Detection in Patients With Different Gynecological Pathologies. The safety and scientific validity of ... The aim of this study is to investigate the prevelence of endometrial nerve fibers in different gynecological pathologies in ... The aim of this study is to investigate the prevelence of endometrial nerve fibers in different gynecological pathologies ...
nerve fiber
Mitochondria are specialized subunits inside a cell that produce the cells energy and regulate its metabolism. Research suggests that mitochondria may play a central role in neuronal cell survival because they regulate both energy metabolism and cell death pathways. Using genetic mouse models of Alzheimers disease, researchers from Mayo Clinic have found that mitochondria in the brain are dysfunctional early in the disease. The findings were recently published in the open access journal PLoS ONE.. ...
Transfer of gut bacteria affects brain function and nerve fiber insulation | EurekAlert! Science News
Transfer of gut bacteria affects brain function and nerve fiber insulation The Mount Sinai Hospital / Mount Sinai School of ... Transfer of gut bacteria affects brain function and nerve fiber insulation. The Mount Sinai Hospital / Mount Sinai School of ... Multiple sclerosis is an autoimmune disorder characterized by damage to myelin, the insulating sheath around the axons of nerve ... The Friedman Brain Institute at the Icahn School of Medicine reported a thinning of myelin and a reduction of myelinated fibers ...
Cool Videos: Regenerating Nerve Fibers - MDI Biological Laboratory
... to track a nerve fiber spreading through the skin of a zebrafish tail fin (gray). The nerve regeneration was occurring in ... The researcher started out by using a laser to sever nerves in a zebrafishs original tail fin, assuming that the nerves would ... it contributed to the degeneration of the fins nerve fibers [2].. Based on these findings, Rieger wants to see whether similar ... Along with other tools, Rieger is using such imaging to explore how the processes of nerve regeneration and wound healing are ...
Preganglionic nerve fibers - Wikipedia
This is due to the number of synapses formed by the preganglionic fibers with ganglionic neurons. Postganglionic fibers Nerve ... fibers from the CNS to the ganglion are known as preganglionic fibers. All preganglionic fibers, whether they are in the ... Sympathetic preganglionic fibers tend to be shorter than parasympathetic preganglionic fibers because sympathetic ganglia are ... sympathetic division or in the parasympathetic division, are cholinergic (that is, these fibers use acetylcholine as their ...
Postganglionic nerve fibers - Wikipedia
Preganglionic fibers Nerve fiber Noback C, Ruggiero DA, Demarest RJ, Strominger NL (2005). The Human Nervous System: Structure ... fibers from the ganglion to the effector organ are called postganglionic fibers. The neurotransmitters of postganglionic fibers ... all of these exceptions are still stimulated by cholinergic pre ganglionic fibers. In both divisions of the autonomic nervous ... where chromaffin cells function as modified post-ganglionic nerves. Instead of releasing epinephrine and norepinephrine into a ...
Abnormal Epidermal Nerve Fiber Density in Fibromyalgia - Prohealth
Abnormal Epidermal Nerve Fiber Density in Fibromyalgia. ProHealth.com • April 14, 2014 ... Evidence of abnormal epidermal nerve fiber density in fibromyalgia: Clinical and immunologic implications. ... Since it is known that similar, large fiber neuropathic lesions may be associated with a cutaneous small fiber neuropathy (SFN ... we sought to determine the prevalence of SFN, as measured by epidermal nerve fiber density (ENFD), in a series of FM patients ...
New technology to measure the sensitivity of nerve fibers that wire up the brain during development
Through use of this technology, they discovered that these fibers, or axons, possess an incredible sensitivity to molecular ... Researchers at Georgetown University have developed a novel technology to precisely measure the sensitivity of nerve fibers ... New technology to measure the sensitivity of nerve fibers that wire up the brain during development. *Download PDF Copy ... But, unlike computers that come with a user and troubleshooting manual, nerve fibers called axons must follow molecular cues to ...
Metanx Effects on Nerve Fiber Density in Neuropathic Diabetics - Tabular View - ClinicalTrials.gov
Metanx Effects on Nerve Fiber Density in Neuropathic Diabetics Official Title ICMJE Metanx Effects on Nerve Fiber Density in ... Increased intraepidermal nerve fiber density [ Time Frame: 1 year ]. If Metanx® is able to reverse nerve damage and improve ... to reverse nerve damage and improve symptoms then the final nerve biopsies will show an increase in intraepidermal nerve fiber ... Metanx Effects on Nerve Fiber Density in Neuropathic Diabetics (SLHN2011-18). The safety and scientific validity of this study ...
AxonsConductionRNFLNeuronsIntraepidermalSmall nerve fibersOptical coherenceAutonomic nervouPostganglionic fibersThinly myelinatedRegenerationSensory fibersAxonBundlesEpidermal nerve fiber densityThicknessEfferent nerve fibersNeuropathicSympathetic nerve fibersDensityAfferent fibersNeuroscienceNervous systemAssociated with retinal nerveCornealStimulationSkin biopsyFunctionalCarry sensoryNeuronRegenerateCutaneousFibreCircumpapillary retinal nerveParasympathetic nerveTissuePreganglionicMyelin sheathOptic chiasmSpinal cord iAction potentialsAuditory nerve fiberInnervationBrain and spinal cordSomaticStimulusCapsaicinImmunoreactiveSynapsesPerivascularPeripheral nerve InjuryDamageGanglionHalvesMembraneThreadlike
Axons20
- C fiber axons are grouped together into what is known as Remak bundles. (wikipedia.org)
- [4] The number of C fiber axons in each Remak bundle varies with location. (wikipedia.org)
- [3] For example, in a rat model, large bundles of greater than 20 axons are found exiting the L5 dorsal root ganglion , while smaller bundles of average 3 axons are found in distal nerve segments. (wikipedia.org)
- A novel noninvasive technique was applied to measure velocity within slow conducting axons in the distal extreme of the sciatic nerve (i.e., digital nerve) in a rat model. (hindawi.com)
- Axons conduct impulses away from the body of the nerve cell, forming connections with other nerve cells or with muscles. (sci-info-pages.com)
- The researchers injured the optic nerves of rats, then used a two-pronged approach to get the axons to regenerate. (sci-info-pages.com)
- As Benowitz's lab had found previously, these growth factors activated genes in the retinal nerve cells, causing new axons to grow into the optic nerve. (sci-info-pages.com)
- Multiple sclerosis is an autoimmune disorder characterized by damage to myelin, the insulating sheath around the axons of nerve cells that allows for faster electrical impulse conduction. (eurekalert.org)
- Through use of this technology, they discovered that these fibers, or axons, possess an incredible sensitivity to molecular guidance cues that direct the axon's route to its desired destination in the brain. (news-medical.net)
- But, unlike computers that come with a user and troubleshooting manual, nerve fibers called axons must follow molecular cues to find the right targets. (news-medical.net)
- On the other hand, the nerve fiber found in the filiform papillae of rat tongue usually are thin terminal axons, which are agree to those reported by Bock (1971). (thefreedictionary.com)
- By analogy, if nerve fibers were trees, then the terminal branches of the axons can be viewed as the tree's branches. (epfl.ch)
- Nervous system development requires billions of neurons to migrate to the appropriate locations in the brain and grow nerve fibers (axons) that connect to other nerve cells in an intricate network. (bio-medicine.org)
- Such intervention could possibly enable damaged axons to regenerate (normally impossible in a mature nervous system) and ultimately restore nerve function. (bio-medicine.org)
- Although there is wide heterogeneity of SFN causes, the available diagnostic tools detect either abnormal nerve function (functional methods) or loss of axons (morphological methods), irrespective of the underlying etiology. (frontiersin.org)
- The study indicated the manner in which immune system B-cells damage axons in the course of MS attacks by hampering the energy production in nerve fiber cells, ultimately bringing about natural death of these cells. (bio-medicine.org)
- Axons are the long, slender fibers of a neuron that serve as the primary transmission lines of the nervous system, and as bundles they help make up nerves. (bio-medicine.org)
- P f /P d ratios for lobster walking leg nerve fibers were found to be about 20 ± 7 at 14°C. P d measurements were made for squid giant axons at 25°C. and found to yield a value of 4 x 10 -4 cm. -1 sec. -1 . (rupress.org)
- The AXONS of the myelinated nerve fibers are completely encased in a MYELIN SHEATH. (umassmed.edu)
- Cross-section of a nerve fiber in intestinal connective tissue showing both myelinated and unmyelinated axons. (gettyimages.com)
Conduction11
- The C group fibers are unmyelinated and have a small diameter and low conduction velocity, whereas Groups A and B are myelinated. (wikipedia.org)
- Because of their higher conduction velocity, Aδ fibers are responsible for the sensation of a quick shallow pain that is specific on one area, termed as first pain . (wikipedia.org)
- Elena G. Zotova and Joseph C. Arezzo, "Noninvasive Evaluation of Nerve Conduction in Small Diameter Fibers in the Rat," Physiology Journal , vol. 2013, Article ID 254789, 11 pages, 2013. (hindawi.com)
- In psychophysical experiments, we used a selective conduction block of myelinated fibers to test the hypothesis that activity in A-fibers contributes to cowhage-induced itch. (jneurosci.org)
- Conduction in myelinated nerve fibers was blocked by the application of local pressure to the superficial radial nerve. (jneurosci.org)
- However, conventional clinical investigation of individuals with painful diabetic neuropathy is usually limited to nerve conduction studies that measure large-nerve fiber function. (diabetesjournals.org)
- Even in the presence of abnormal nerve conduction studies, some individuals may experience pain while others with the same degree of electrophysiological abnormalities are completely asymptomatic. (diabetesjournals.org)
- Nerve fibers are classified according to: Diameter Degree of myelination Speed of conduction. (slideserve.com)
- Their NEURAL CONDUCTION rates are faster than those of the unmyelinated nerve fibers (NERVE FIBERS, UNMYELINATED). (umassmed.edu)
- Physiological conduction velocities of 20.2 m/s at 20$\sp\circ$C for a 15$\mu$m diameter amphibian fiber and 57.6 m/s at 37$\sp\circ$C for a 17.5$\mu$m diameter mammalian fiber were achieved. (rice.edu)
- Quantitative sensory hand function and sensory conduction studies by near-nerve technique, including tactile stimulation of mechanoreceptors, were followed for 2 years, and results were compared to noninjured hands. (ovid.com)
RNFL15
- 4,5 Apart from elevated intraocular pressure (IOP), various pressure independent factors represent the main risk factors for loss of retinal nerve fiber layer (RNFL) with subsequent glaucomatous damage in PXF syndrome. (thefreedictionary.com)
- To present full ophthalmologic examination and retinal nerve fiber layer (RNFL) photographs of autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) patients showing significant increases in RNFL thickness compared to healthy subjects, but without myelinated retinal fibers. (molvis.org)
- We found evidence of RNFL hypertrophy in ARSACS patients that may have been interpreted as hypermyelinated retinal fibers in previous reports. (molvis.org)
- thickness of retinal nerve fibre layer (RNFL) and ganglion cell complex (GCC). (dovepress.com)
- This pilot cross-sectional study aimed to determine age-related changes of the retinal nerve fiber layer (RNFL) thickness in retinal periphery by swept-source optical coherence tomography-based analysis. (dovepress.com)
- Continued analysis in patients with ocular hypertension and glaucoma should help determine whether RNFL in the periphery with lower nerve tissue reserve might be more susceptible to injury, whether injury to the peripheral RNFL might be easier to detect, and/or whether analysis of the peripheral RNFL thickness could improve clinical diagnosis and follow-up of glaucoma. (dovepress.com)
- To evaluate quantitatively the structural damage of the peripapillary retinal nerve fiber layer (RNFL) in eyes with disc hemorrhage (DH). (unboundmedicine.com)
- Usually retinal nerve fiber layer (RNFL) thinning can be present in ODD. (scielo.br)
- To evaluate the role and ability of optical coherence tomography (OCT) to detect differences in peripapillary retinal nerve fiber layer (RNFL) thickness between normal and glaucomatous eyes and also between different severities of glaucoma. (unboundmedicine.com)
- To study the correlation between serum levels of vitamin B 12 , folic acid, and homocysteine and the severity of diabetic retinopathy and the correlation with retinal nerve fiber layer (RNFL) thinning on spectral domain optical coherence tomography (SD-OCT). (molvis.org)
- To compare the retinal nerve fiber layer (RNFL) measurements using two different ocular coherence tomography (OCT) devices: Cirrus Fourier domain OCT and Stratus time domain OCT. To analyze reproducibility of Fourier domain measurements in healthy subjects. (nih.gov)
- To investigate the effect on optical coherence tomography (OCT) retinal nerve fiber layer (RNFL) thickness measurements of varying the standard 3.4-mm-diameter circle location. (pubmedcentralcanada.ca)
- Accurate assessment of the retinal nerve fiber layer (RNFL) is an important component in the diagnosis and management of glaucoma. (pubmedcentralcanada.ca)
- Histopathologic studies have reported retinal nerve fiber layer (RNFL) thinning in various neurodegenerative diseases. (pubmedcentralcanada.ca)
- 1 Specifically with multiple sclerosis, histopathologic studies have reported retinal nerve fiber layer (RNFL) thinning, and these changes have been correlated with disease activity and white matter lesion volume on neuroradiologic studies, such as magnetic resonance imaging. (pubmedcentralcanada.ca)
Neurons10
- C fibers synapse to second-order projection neurons in the spinal cord at the upper laminae of the dorsal horn in the substantia gelatinosa . (wikipedia.org)
- [5] The second-order projection neurons are of the wide dynamic range (WDR) type, which receive input from both nociceptive terminals as well as myelinated A-type fibers. (wikipedia.org)
- Scientists have proven that these nanomaterials may regulate the formation of synapses, specialized structures through which the nerve cells communicate, and modulate biological mechanisms, such as the growth of neurons, as part of a self-regulating process. (nanowerk.com)
- This result, which shows the extent to which the integration between nerve cells and these synthetic structures is stable and efficient, highlights the great potentialities of carbon nanotubes as innovative materials capable of facilitating neuronal regeneration or in order to create a kind of artificial bridge between groups of neurons whose connection has been interrupted. (nanowerk.com)
- This is due to the number of synapses formed by the preganglionic fibers with ganglionic neurons. (wikipedia.org)
- The neurotransmitters of postganglionic fibers differ: In the parasympathetic division, neurons are cholinergic. (wikipedia.org)
- Neurons (Nerve Cells). (slideserve.com)
- In a recent paper in Materials Science and Engineering C, they discovered new techniques to optimize how fibers made from poly-L-lactide, a biodegradable polymer, can be better aligned to resemble neurons and to guide regenerating nerve cells. (nanotech-now.com)
- Peripheral nerves, which have neurons at the center surrounded by cells called Schwann cells, can also be studied using the nanofiber technique. (nanotech-now.com)
- Morphometry of intracellularly labeled neurons of the auditory nerve: correlations with functional properties. (semanticscholar.org)
Intraepidermal7
- We examined intraepidermal nerve fibers (IENFs) to evaluate the role of small nerve fibers in the genesis of neuropathic pain. (diabetesjournals.org)
- Direct examination of intraepidermal nerve fibers (IENF) using skin biopsy technique is a proven procedure to identify small-fiber abnormalities. (diabetesjournals.org)
- There are no evaluations for Intraepidermal nerve fiber density (IENFD). (patientslikeme.com)
- Each group will have intraepidermal nerve fiber densities obtained by skin biopsies taken at the beginning of the study before any treatment has begun as well as a final intraepidermal nerve skin biopsy at the end of twelve months to re-biopsy. (clinicaltrials.gov)
- Mean intraepidermal nerve fiber (IENF) density was in the lower normal age-adjusted range, 7.2 ± 2.9/mm (normal ≥7/mm), and was slightly below the normal range in 45% of POTS patients. (wiley.com)
- They evaluated the intraepidermal nerve fiber (IENF) density in skin-biopsies of the lower leg, and applied clinical assessments of small fiber function in 17 FRDA patients. (curefa.org)
- Long-term effects of neonatal capsaicin treatment on intraepidermal nerve fibers and keratinocyte proliferation in rat glabrous skin. (harvard.edu)
Small nerve fibers4
- However, in view of the pivotal role played by small nerve fibers in the transmission of pain sensation, further studies are obviously of importance. (diabetesjournals.org)
- In this study, the authors aimed at gaining further insight in the PNS involvement in FRDA by investigating small nerve fibers in patients. (curefa.org)
- ESC can be useful in detecting loss of small nerve fibers. (frontiersin.org)
- Small nerve fibers, thinly myelinated Aδ-fibers and unmyelinated C-fibers, can be separated into autonomic (efferent) or sensory (afferent). (frontiersin.org)
Optical coherence2
- Optical coherence tomography (OCT) manufacturers graphically present circumpapillary retinal nerve fiber layer thickness (cpRNFLT) together with normative limits to support clinicians in diagnosing ophthalmic diseases. (spiedigitallibrary.org)
- Comparison of retinal nerve fiber layer thickness measurements in healthy subjects using fourier and time domain optical coherence tomography. (nih.gov)
Autonomic nervou3
- Group C fibers include postganglionic fibers in the autonomic nervous system (ANS), and nerve fibers at the dorsal roots (IV fiber). (wikipedia.org)
- In the autonomic nervous system, fibers from the CNS to the ganglion are known as preganglionic fibers. (wikipedia.org)
- In the autonomic nervous system, fibers from the ganglion to the effector organ are called postganglionic fibers. (wikipedia.org)
Postganglionic fibers1
- the gray rami communicantes contains no sensory fibers but containsympathetic postganglionic fibers. (proprofsdiscuss.com)
Thinly myelinated1
- Magerl, 1991 ) suggest that activity in thinly myelinated Aδ-fibers may contribute to the sensation of itch. (jneurosci.org)
Regeneration13
- [3] Study of Remak bundles has important implications in nerve regeneration after sustaining injury. (wikipedia.org)
- The nerve regeneration was occurring in tissue being spontaneously formed to replace a section of a young zebrafish's tail fin that had been lopped off 3 days earlier. (georgetown.edu)
- Along with other tools, Rieger is using such imaging to explore how the processes of nerve regeneration and wound healing are coordinated. (georgetown.edu)
- By combining two strategies - activating nerve cells' natural growth state and using gene therapy to mute the effects of growth-inhibiting factors - they achieved about three times more regeneration of nerve fibers than previously attained. (sci-info-pages.com)
- When we combined these two therapies - activating the growth program in nerve cells and overcoming the inhibitory signaling - we got very dramatic regeneration," said Benowitz, who is also an associate professor of neurosurgery at Harvard Medical School and holds a Ph.D. in biology/psychobiology. (sci-info-pages.com)
- This three-pronged recipe was designed to reproduce the conditions underlying the growth of nerve fibers during development, leading to a robust regeneration of severed nerve fibers through and beyond a complete spinal cord injury. (epfl.ch)
- Understanding these pathways could help in understanding the process of nerve regeneration," says Greenberg, who is also Professor of Neurology and Neurobiology at Harvard Medical School. (bio-medicine.org)
- We have investigated the relationships between touch threshold, tactile gnosis, and mechanoreceptor and sensory fiber function after nerve regeneration. (ovid.com)
- For nerve damage caused by trauma, on the other hand, we need to encourage regeneration. (nanotech-now.com)
- Corneal subbasal nerve fiber regeneration in myopic patients after laser in situ keratomileusis. (nih.gov)
- The majority of corneal subbasal nerve fiber regeneration occurred from the stump of corneal subbasal nerve fibers outside the corneal flap, and the remaining growth occurred deep within the stroma. (nih.gov)
- DALLAS - November 7, 2016 - TissueGen® Inc., developer of ELUTE® fiber, enables controlled sustained delivery of sensitive pharmaceuticals and biologics from biodegradable fibers for advanced drug delivery, nerve regeneration, and tissue engineering. (textileworld.com)
- TissueGen works with leading pharmaceutical, therapeutic, and medical device companies to develop fiber and textile medical devices for use in drug delivery applications such as small diameter vascular grafts and stents, tissue and nerve regeneration, orthopedic devices and sutures. (textileworld.com)
Sensory fibers2
- The morphological methods include skin biopsies for assessment of sensory fibers using epidermal nerve fiber density (ENFD) and sudomotor fibers using sweat gland nerve fiber density (SGNFD). (frontiersin.org)
- the vagus nerves carry sensory fibers associated with reflexes in the gastrointestinal (gi) tract. (proprofsdiscuss.com)
Axon8
- The axon of a nerve cell. (thefreedictionary.com)
- Silver granules were present in the axoplasm of some myelinated fibers and in some of the axon terminals. (sciencemag.org)
- An axon or nerve fiber is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body or soma. (medicalxpress.com)
- Some synaptic junctions appear partway along an axon as it extends-these are called en passant ("in passing") synapses. (medicalxpress.com)
- Following transection of a giant axon, the nerve membrane at the cut end is resealed within 5 to 30 minutes. (sciencemag.org)
- A threadlike extension of a nerve cell and consists of an axon and myelin sheath (if it is myelinated) in the nervous system. (bioontology.org)
- A peripheral nerve fiber contains an axon, myelin sheath, schwann cells and its endoneurium. (bioontology.org)
- also centripetal, or sensory, fiber, the nerve cell outgrowth, or axon, that together with its membrane transmits excitation from the external and internal receptors to the central nervous system-specifically, to the spinal cord or the various sections of the brain. (thefreedictionary.com)
Bundles12
- [3] Remak bundles in the distal peripheral nerve are clustered with other Remak bundles. (wikipedia.org)
- 4. The external spiral bundle increases its fiber count when internal and tunnel spiral bundles were present in the organ of Corti. (nih.gov)
- 7. The nerve fibers were found in the organ of Corti lateral to the external spiral bundles. (nih.gov)
- Does anybody know why so many nerve fiber bundles decussate in CNS? (bio.net)
- Wouldn't be the same if nerve fiber bundles just travelled through the CNS without crossing the middle line? (bio.net)
- Dr. Kim and colleagues studied the results of these collisions on youth football players using a novel MRI method that looks at the strain evident on white matter tracts-the bundles of nerve fibers that carry information between different areas of the brain. (pharmiweb.com)
- The focus here was on deformations of these fiber bundles," Dr. Kim said. (pharmiweb.com)
- Normal myelination of anatomic nerve fiber bundles: MR analysis. (ajnr.org)
- PURPOSE In order to establish milestones of brain maturation by MR imaging, we examined the initiation of myelination of fiber bundles and of surrounding white matter. (ajnr.org)
- In 24 sites of 18 fiber bundles in eight cross sections obtained perpendicular to the long axis of the brain stem, we analyzed the initiation of myelination and the age at which fiber bundles become indistinguishable owing to myelination of the surrounding white matter (blurring). (ajnr.org)
- RESULTS The fiber bundles were classified into two groups on the basis of the presence or absence of blurring. (ajnr.org)
- CONCLUSION The time of blurring, when myelinated fiber bundles become indistinguishable from surrounding white matter owing to the initiation of myelination, is considered to be a useful parameter of brain maturation in infancy. (ajnr.org)
Epidermal nerve fiber density3
- Evidence of abnormal epidermal nerve fiber density in fibromyalgia: Clinical and immunologic implications. (prohealth.com)
- Since it is known that similar, large fiber neuropathic lesions may be associated with a cutaneous small fiber neuropathy (SFN), we sought to determine the prevalence of SFN, as measured by epidermal nerve fiber density (ENFD), in a series of FM patients and clinically healthy controls. (prohealth.com)
- The primary outcome measure was the correlation between ESC at the feet and results of skin biopsies including epidermal nerve fiber density (ENFD) and sweat gland nerve fiber density (SGNFD) at the distal leg. (frontiersin.org)
Thickness3
- Correlation between Axial Length and Retinal Nerve Fiber Layer Thickness in Myopic Eyes. (thefreedictionary.com)
- Purpose: To investigate the value of temporal retinal nerve fiber layer (RNFLtemporal) thickness in the prediction of malingering. (ebscohost.com)
- Thickness of quadrant, average and the 12 different areas around the optic nerve were compared between Cirrus and Stratus. (nih.gov)
Efferent nerve fibers2
- Acetylcholinesterase activity in the efferent nerve fibers of the human inner ear. (nih.gov)
- the most common, or mixed, type of nerve also contains efferent nerve fibers that lead to the effector organs. (thefreedictionary.com)
Neuropathic3
- Damage or injury to nerve fibers causes neuropathic pain . (wikipedia.org)
- OBJECTIVE -Many individuals with diabetes experience neuropathic pain, often without objective signs of large-fiber neuropathy. (diabetesjournals.org)
- A subset of neuropathic POTS patients may harbor mild small fiber neuropathy with abnormalities of unmyelinated nerve fibers in the skin associated with reduced myocardial postganglionic sympathetic innervation. (wiley.com)
Sympathetic nerve fibers2
- Anatomically, each of these effectors has a dual pattern of innervation consisting of a specific and selective innervation by unmyelinated slowly conducting C-type renal sympathetic nerve fibers in addition to an innervation that is shared among all the effectors. (physiology.org)
- 1989) where they are probably colocalized with noradrenaline in sympathetic nerve fibers (Gale et al. (docme.ru)
Density4
- C , Interspike interval histograms of spontaneous activity from all fibers with SR between 40 and 50 spikes per second: these histograms are normalized by the total spike count to reflect an estimate of the probability density function (bin width, 0.5 ms). (jneurosci.org)
- In humans, a retrospective analysis of breast cancer specimens from 29 patients revealed that increased sympathetic and decreased parasympathetic nerve density in tumors were associated with poor clinical outcomes and correlated with higher expression of immune checkpoint molecules. (nature.com)
- Fig. 8: Expression of immune checkpoint molecules positively and negatively correlates with sympathetic and parasympathetic nerve density, respectively, in human breast cancer samples. (nature.com)
- At 6 months after transplantation, repeat scans in 11 of the patients who had neuropathy showed that nerve fiber density and length had improved significantly. (thefreedictionary.com)
Afferent fibers2
- [1] They are afferent fibers , conveying input signals from the periphery to the central nervous system. (wikipedia.org)
- 6. 85-90% of the afferent fibers went to the internal hair cells, while the remainder went to the external hair cells. (nih.gov)
Neuroscience3
- This years Nikon Small World Photomicrography Competition features some amazing work including this laser confocal image of a mouse nerve fiber layer on a retinal flatmount at 40X magnification by Gabriel Luna out of the Steve Fisher and Geoff Lewis's retinal cell biology group at UC Santa Barbara Neuroscience Research Institute . (utah.edu)
- TissueGen, Inc. will showcase ELUTE® fiber for advanced pharmaceutical and biologics delivery from biodegradable polymers in Booth 3013 at the Society for Neuroscience's Neuroscience 2016 meeting. (textileworld.com)
- At Neuroscience 2016, explore how TissueGen's patented manufacturing process enables controlled sustained delivery of the broadest range of temperature-sensitive pharmaceuticals and biologics ever possible via biodegradable fiber-based devices to enable medical device developers to achieve breakthroughs across a broad range of medical applications. (textileworld.com)
Nervous system6
- Group C nerve fibers are one of three classes of nerve fiber in the central nervous system (CNS) and peripheral nervous system (PNS). (wikipedia.org)
- C fibers are unmyelinated unlike most other fibers in the nervous system. (wikipedia.org)
- Like other components of the sympathetic nervous system, all of these exceptions are still stimulated by cholinergic pre ganglionic fibers. (wikipedia.org)
- Yet, injuries to the spinal cord lead to devastating conditions, since severed nerve fibers fail to regenerate in the central nervous system. (epfl.ch)
- There are nerve fibers in the central nervous system and peripheral nervous system. (bioontology.org)
- The nerve cells are located either in the receptor organ itself or in special sensory ganglia that are close to the central nervous system. (thefreedictionary.com)
Associated with retinal nerve1
- Visual defects of glaucoma have been associated with retinal nerve fiber layer (NFL) defects, which can be detected as color and texture difference compared to normal NFL using photographs of NFL. (spie.org)
Corneal8
- The cornea is the most densely innervated tissue in the body, so corneal nerve assessment is extremely sensitive for detecting small sensory nerve fiber damage as compared to other tests including measurement of intra-epidermal nerve fibers in the skin, notes lead investigator Joseph L. (thefreedictionary.com)
- Corneal nerve fibers (CNFs) are composed of unmyelinated C-fibers, which are the first nerve fibers to undergo damage and subsequent repair. (diabetesjournals.org)
- In vivo confocal microscopy revealed that most of the regenerated corneal subbasal nerve fibers in the corneal flap originated from the stump of corneal subbasal nerve fibers outside the ablation zone and extended towards the center of the cornea in all patients. (nih.gov)
- Approximately 94% of regenerated corneal subbasal nerve fibers (73/78 eyes) regrew vertically into the peripheral central 6-mm circle area 1 month after surgery, 78% (28/36 eyes) grew into the central 3-6 mm area at 2 months, and 23% into the central 3-mm circle area at 3 months. (nih.gov)
- In addition, there was no significant difference in corneal subbasal nerve fiber regenerative capacity between the basic fibroblast growth factor group and the 20% (v/v) deproteinized extract of calf blood group. (nih.gov)
- Regenerated corneal subbasal nerve fibers in the corneal flap at 1 month (A), 2 months (B) and 3 months (C) after laser in situ keratomileusis (× 800). (nih.gov)
- At 1 month after surgery, the regenerated fibers derived from the stump of corneal subbasal nerve fibers outside the incision observed in the circle were assigned a score of 1 in 24 eyes (92.3%) from the laser in situ keratomileusis group and in 49 eyes (94.2%) from the sub-bowman keratomileusis group. (nih.gov)
- Meanwhile, corneal subbasal nerve fibers from two eyes (3.8%) in the sub-bowman keratomileusis group had reached the 3-6 mm diameter circle area (scores 2) (Figures 2, 3). (nih.gov)
Stimulation6
- Breast cancer growth and progression were accelerated following stimulation of sympathetic nerves in tumors, but were reduced following stimulation of parasympathetic nerves. (nature.com)
- Once the detailed intrinsic renal sympathetic innervation was more clearly understood, it was readily demonstrated in a variety of species that low-frequency renal sympathetic nerve stimulation, which did not affect renal blood flow or glomerular filtration rate, caused a reversible decrease in urinary sodium excretion. (physiology.org)
- A point process framework for modeling electrical stimulation of the auditory nerve. (semanticscholar.org)
- Auditory nerve fiber responses to electric stimulation: modulated and unmodulated pulse trains. (semanticscholar.org)
- Electrically evoked single-fiber action potentials from cat: responses to monopolar, monophasic stimulation. (semanticscholar.org)
- Discharge patterns of cat primary auditory fibers with electrical stimulation of the cochlea. (semanticscholar.org)
Skin biopsy1
- Our objective in this study was to evaluate the correlation between C-fiber involvement as shown by skin biopsy and adrenergic cardiac metaiodobenzylguanadine (MIBG) uptake in POTS patients. (wiley.com)
Functional2
- However, rigorous psychophysical and neurophysiological evidence for a functional role of A-fibers in the mediation of nonhistaminergic itch in primates is lacking. (jneurosci.org)
- Rehabilitation is still required to make these new nerve fibers functional for walking. (epfl.ch)
Carry sensory1
- These fibers carry sensory information. (wikipedia.org)
Neuron3
- This differentiated regulation occurs via mechanisms that operate at multiple sites within the classic reflex arc: peripherally at the level of afferent input stimuli to various reflex pathways, centrally at the level of interconnections between various central neuron pools, and peripherally at the level of efferent fibers targeted to various effectors within the organ. (physiology.org)
- If it's about the same length and diameter as a neuron, the nerve cells follow it and their shape and location conform to it," he says. (nanotech-now.com)
- Essentially, these fibers are the same size as a neuron. (nanotech-now.com)
Regenerate7
- The researcher started out by using a laser to sever nerves in a zebrafish's original tail fin, assuming that the nerves would regenerate-but they did not! (georgetown.edu)
- Researchers have advanced a decades-old quest to get injured nerves to regenerate. (sci-info-pages.com)
- Researchers at Children's Hospital Boston and Harvard Medical School have advanced a decades-old quest to get injured nerves to regenerate. (sci-info-pages.com)
- What if it were possible to regenerate severed nerve fibers across spinal cord injury? (epfl.ch)
- In a collaboration led by EPFL (Ecole polytechnique fédérale de Lausanne) in Switzerland and UCLA (University of California at Los Angeles) in the USA, scientists have now understood the underlying biological mechanisms required for severed nerve fibers to regenerate across complete spinal cord injury, bridging that gap in mice and rats for the first time. (epfl.ch)
- He sees the pain, the loss of ability and the other effects that nerve-destroying conditions cause - and wishes he could give patients more effective treatments than what's available, or regenerate their nerves. (nanotech-now.com)
- Meanwhile, new fibers were also found to directly regenerate from deep in the stroma in some cases. (nih.gov)
Cutaneous1
- While some of the afferent nerves consist of fibers from different receptors (for example, cutaneous and muscular), most nerves consist of fibers of a single sensory type. (thefreedictionary.com)
Fibre3
- Researchers have discovered the main culprit for nerve fibre damage in. (bio-medicine.org)
- Researchers have discovered the main culprit for nerve fibre damage in multiple sclerosis, which is triggered by the body's own immune system, which is vital for early diagnosis // and evolving improved treatment of a severe disease. (bio-medicine.org)
- The present data provide direct evidence that 5-HT in the female reproductive system not only is associated with mast cells but is located in nerve fibre-like structures as well. (docme.ru)
Circumpapillary retinal nerve1
- Circumpapillary retinal nerve fiber layer (cpRNFL) originating from temporal hemiretina mainly distributed at temporal-upper and lower area of optic disc. (arvojournals.org)
Parasympathetic nerve2
- The vagina is innervated by a complex arrangement of sensory, sympathetic, and parasympathetic nerve fibers that contain classical transmitters plus an array of neuropeptides and enzymes known to regulate diverse processes including blood flow and nociception. (sigmaaldrich.com)
- Fig. 7: Abundance of sympathetic and sparcity of parasympathetic nerve fibers in individuals with breast cancer with recurrence. (nature.com)
Tissue2
- The middle panel shows a nerve cell growing on the resulting mesh, which has a texture similar to the body's fibrous connective tissue. (science20.com)
- Synthetic neural scaffolds hold promise to eventually replace nerve autografts for tissue repair following peripheral nerve injury. (mit.edu)
Preganglionic2
- All preganglionic fibers, whether they are in the sympathetic division or in the parasympathetic division, are cholinergic (that is, these fibers use acetylcholine as their neurotransmitter) and they are myelinated. (wikipedia.org)
- Sympathetic preganglionic fibers tend to be shorter than parasympathetic preganglionic fibers because sympathetic ganglia are often closer to the spinal cord than are the parasympathetic ganglia. (wikipedia.org)
Myelin sheath1
- This thesis is concerned with the development of a new distributed-parameter model of the myelinated nerve fiber that includes an adequate representation of the anatomical complexity present at the node of Ranvier, considers the peri-axonal conductance pathway and includes active ionic channels in the axolemmal membrane beneath the myelin sheath. (rice.edu)
Optic chiasm1
- In our visual system, the optic nerves normally combine at a place called the optic chiasm. (medicalxpress.com)
Spinal cord i1
- The study involved the optic nerve, which connects nerve cells in the retina with visual centers in the brain, but the Children's team has already begun to extend the approach to nerves damaged by spinal cord injury, stroke, and certain neurodegenerative diseases. (sci-info-pages.com)
Action potentials1
- The sensory nerve action potentials (SNAPs) remained dispersed and areas recovered to 23 ± 2% and the amplitudes only to 7 ± 1% (P (ovid.com)
Auditory nerve fiber1
- Each auditory nerve fiber enters the brain and divides to terminate in both the cochlear nucleus angularis and the cochlear nucleus magnocellularis. (nih.gov)
Innervation2
- Differences between young and older mice were present in multiple layers of the vaginal wall, with older mice showing overall loss of innervation of epithelium of the proximal vagina and reduced proportions of VIP, CGRP, and SP containing nerve fibers in the distal epithelium. (sigmaaldrich.com)
- Here we developed a series of genetic techniques to manipulate autonomic innervation in a tumor- and fiber-type-specific manner in mice with human breast cancer xenografts and in rats with chemically induced breast tumors. (nature.com)
Brain and spinal cord2
- In 2002, they reported that inosine helped stroke-impaired rats to regrow nerve connections between brain and spinal cord and partially recover motor function. (sci-info-pages.com)
- In MS, the immune system damages and destroys myelin, the material that surrounds and protects nerve fibers in the brain and spinal cord. (thefreedictionary.com)
Somatic3
- C fibers are one class of nerve fiber found in the nerves of the somatic sensory system . (wikipedia.org)
- The auditory nerve profiles contain round clear vesicles and form punctate asymmetric synapses on both somatic spines and the cell body. (nih.gov)
- Myelinated nerve fibers are present in somatic and autonomic nerves. (umassmed.edu)
Stimulus2
- The sound-evoked rate is reduced in mutant AN fibers, particularly for rapid stimulus onsets. (jneurosci.org)
- Effect of stimulus level on the temporal response properties of the auditory nerve in cochlear implants. (semanticscholar.org)
Capsaicin1
- In electrophysiological recordings from primary afferents in the anesthetized monkey, we tested whether cowhage, histamine, or capsaicin activated high threshold A-fiber afferents. (jneurosci.org)
Immunoreactive3
- Substance P-like immunoreactive nerve fibers in the trabecular meshwork. (arvojournals.org)
- Localization of 5-hydroxytryptamine-like immunoreactive cells and nerve fibers in the rat female reproductive system. (docme.ru)
- The occurrence of 5-HT-like immunoreactive (IR) nerve fibers has been demonstrated in the perivascular nerves of different vascular beds (Costa et al. (docme.ru)
Synapses1
- Spontaneous activity of auditory-nerve fibers: insights into stochastic processes at ribbon synapses. (semanticscholar.org)
Perivascular1
- The distal vagina also showed increased vascularization and perivascular fibers containing NPY. (sigmaaldrich.com)
Peripheral nerve Injury1
- Sensation is essential for recovery after peripheral nerve injury. (ovid.com)
Damage14
- So, she went back to the drawing board and discovered that if she also used the laser to damage some skin cells in the tail fin, the nerves regenerated. (georgetown.edu)
- Rieger and colleagues went on discover that the opposite is also true: when they used a cancer chemotherapy drug to damage skin cells in a zebrafish tail fin, it contributed to the degeneration of the fin's nerve fibers [2]. (mdibl.org)
- Based on these findings, Rieger wants to see whether similar processes may be going on in the hands and feet of cancer patients who struggle with painful nerve damage, called peripheral neuropathy, caused by certain chemotherapy drugs, including taxanes and platinum compounds. (mdibl.org)
- This study focuses on the use of Metanx® as the sole treatment for improving and reversing nerve damage in type 2 diabetic patients with peripheral neuropathy. (clinicaltrials.gov)
- A new study suggests smoking high-potency marijuana may cause damage to nerve fibers responsible for communication between the brain's two hemispheres. (ncadd.org)
- After bowel surgery, more than half of the patients suffer from irreparable nerve damage. (medicalxpress.com)
- New research presented Thursday, Nov. 29, at RSNA's 2018 Annual Meeting added to that focus, finding the sport may damage brain fibers in young football players. (healthimaging.com)
- Basis for Nerve fiber Damage in Multiple Sclerosis Discovered ( Researchers have discovered the main cu. (bio-medicine.org)
- In new research published in several recent papers, Corey and his colleagues from the U-M Medical School, VAAAHS and the University of California, San Francisco report success in developing polymer nanofiber technologies for understanding how nerves form, why they don't reconnect after injury, and what can be done to prevent or slow damage. (nanotech-now.com)
- They've even managed to encourage the process of myelination - the formation of a protective coating that guards larger nerve fibers from damage. (nanotech-now.com)
- Parameters associated with vulnerability of nerve fibers to glaucomatous damage. (nii.ac.jp)
- It was our clinical impression that topographic variation of the optic disc is a factor for this variable susceptibility of nerve fiber to glaucomatous damage. (nii.ac.jp)
- In conclusion, macroscopic variation of the optic disc is an important parameter which affect vulnerability of nerve fiber to glaucomatous damage. (nii.ac.jp)
- A new methodology is of value in assessing the degree of glaucomatous nerve damage in clinical practice. (nii.ac.jp)
Ganglion1
- How many rods and cones per ganglion cell and an optic fiber? (brainscape.com)
Halves2
- The MRI results showed that the football players developed changes in the corpus callosum, a critically important band of nerve fibers that connects the two halves of the brain. (pharmiweb.com)
- Results confirmed their suspicions, revealing football players developed changes in the corpus callosum-central nerve fibers that connect the two halves of the brain. (healthimaging.com)
Membrane4
- Specific and unspecific charges at the sodium channels of the nerve membrane. (springer.com)
- We propose that calcium activated phospholipase A2 plays a central role in resealing of the ruptured nerve membrane. (sciencemag.org)
- At the point of contact, only the basement membrane separates the nerve endings from the tubule cells. (physiology.org)
- Osmotic and diffusion permeabilities ( P f and P d ) of invertebrate nerve fibers to tritiated water were measured to determine what water flux studies could reveal about "the nerve membrane" and to directly test the possibility of active transport of water into or out of invertebrate nerve fibers. (rupress.org)
Threadlike1
- Any of various elongated cells or threadlike structures, especially a muscle fiber or a nerve fiber. (thefreedictionary.com)