The outer ear is the external portion of the ear and includes the fleshy visible pinna (also called the auricle), the ear canal, and the outer layer of the eardrum (also called the tympanic membrane). (wikipedia.org)
the latter is next the original cavity of the optic vesicle, and therefore corresponds to the inner limiting membrane of the spinal medulla. (co.ma)
The germinal cells are always situated beneath the external limiting membrane, and by their division give rise to the neuroblasts. (co.ma)
and (b) the external acoustic meatus leading inwards from the most depressed part of the auricula to the tympanic membrane. (co.ma)
It is fixed, along its entire length, to the membrana propria of the tympanic membrane by its periosteum and by a layer of cartilage (Gruber). (co.ma)
Anatomically, the ear can be divided into 3 parts: the outer ear, the middle ear Middle ear The space and structures directly internal to the tympanic membrane and external to the inner ear (labyrinth). (lecturio.com)
The design of the ear's lobes make it perfect to collect waves and funnel them to the eardrum, which is also known as the tympanic membrane, via the external auditory canal. (mskneurology.no)
Two muscles control the tension between the hammer and tympanic membrane, as well as between the oval window and stirrup, namely the stapedius and tensor tympani muscles. (mskneurology.no)
The middle ear consists of the tympanic cavity, an air-filled cavity whose outer walls form the tympanic membrane (eardrum), and communicates proximally with the nasopharynx by the Eustachian tubes, which maintain pressure equilibrium on either side of the tympanic membrane. (cloudaccess.net)
The tympanic membrane is linked to the inner ear by the ossicles, specifically by the mobile foot of the stapes, which lies against the oval window. (cloudaccess.net)
Semicircular2
The inner ear contains the otolith organs-the utricle and saccule-and the semicircular canals belonging to the vestibular system, as well as the cochlea of the auditory system. (wikipedia.org)
The neurosensory structures involved in hearing and equilibrium are located in the membranous labyrinth: the organ of Corti is located in the cochlear canal, while the maculae of the utricle and the saccule and the ampullae of the semicircular canals are located in the posterior section. (cloudaccess.net)
Ossicles7
The middle ear includes the tympanic cavity and the three ossicles. (wikipedia.org)
The middle ear contains the three small bones-the ossicles-involved in the transmission of sound, and is connected to the throat at the nasopharynx, via the pharyngeal opening of the Eustachian tube. (wikipedia.org)
The ossicles are three small bones that function together to receive, amplify, and transmit the sound from the eardrum to the inner ear. (wikipedia.org)
The three ossicles transmit sound from the outer ear to the inner ear. (wikipedia.org)
Its major components include the auditory ossicles and the eustachian tube that connects the cavity of middle ear (tympanic cavity) to the upper part of the throat. (lecturio.com)
This area mainly consist of the ossicles, eustachian tube and the tympanic plexus. (mskneurology.no)
The tympanic cavity also contains the ossicles-the malleus, incus and stapes-which are controlled by the stapedius and tensor tympani muscles. (cloudaccess.net)
Communicates1
The utricle communicates with the saccule through the utriculosaccular duct from which the endolymphatic duct arises. (lecturio.com)
It has a natural secretion of cerumen (ear wax) that protects the canal and prevents unwanted entities or particles to enter it, thus protecting the eardrum and middle & inner ear segments. (mskneurology.no)
The eustachian tube's main role is to equalize the pressure between the in- and outside of the ear, i.e on both sides of the eardrum. (mskneurology.no)
Increased pressure in the middle ear, usually due to inability of the eustachian tube to open, will restrict vibrations in the eardrum and thus also dampen hearing. (mskneurology.no)
Eustachian2
The middle ear also connects to the upper throat at the nasopharynx via the pharyngeal opening of the Eustachian tube. (wikipedia.org)
This transport mechanism (i.e the mucociliary transport mechanism) drains mucus away from the middle ear, and into the nasopharynx via the eustachian tube, thus preventing infection from occurring in the middle ear. (mskneurology.no)
Auditory3
This bony part is known as the auditory bulla and is formed by the tympanic part of the temporal bone. (wikipedia.org)
The ear or auditory organ (Fig. 703) consists of three portions-external, middle, and internal-the last constituting its essential part, since the peripheral terminations of the acoustic nerve are distributed within it. (co.ma)
The outer ear consists of the auricle, a cartilaginous skin-covered structure, and the external auditory canal, an irregularly-shaped cylinder approximately 25 mm long which is lined by glands secreting wax. (cloudaccess.net)
Plexus1
The great auricular nerve, auricular nerve, auriculotemporal nerve, and lesser and greater occipital nerves of the cervical plexus all supply sensation to parts of the outer ear and the surrounding skin. (wikipedia.org)
Auricle1
The external ear, also called the 'pinna' or 'auricle', is designed mainly to capture the sound waves. (mskneurology.no)
Inner ear8
In mammals the ear is usually described as having three parts: the outer ear, the middle ear and the inner ear. (wikipedia.org)
Finally, the inner ear contains the bony labyrinth, along with other structures essential for spatial orientation Spatial orientation Change in position or alignment in response to an external stimulus. (lecturio.com)
Utricle Utricle A membranous sac within the vestibular labyrinth of the inner ear. (lecturio.com)
The cochlear nerve crosses the inner ear canal and extends to the central structures of the brain stem, the oldest part of the brain. (cloudaccess.net)
The pinna consists of the curving outer rim called the helix, the inner curved rim called the antihelix, and opens into the ear canal. (wikipedia.org)
It consists of myelencephalon, metencephalon, and isthmus rhombencephalon from which develop the major brain stem components, such as medulla oblongata from the myelencephalon, cerebellum and pons from the metencephalon, with the expanded cavity forming the fourth ventricle. (lecturio.com)
It consists of a bony shell (the bony labyrinth) within which is found the membranous labyrinth-a series of cavities forming a closed system filled with endolymph, a potassium-rich liquid. (cloudaccess.net)
Pathways2
Diseases of the ear may lead to hearing loss, tinnitus and balance disorders such as vertigo, although many of these conditions may also be affected by damage to the brain or neural pathways leading from the ear. (wikipedia.org)
The brain accomplishes this by comparing arrival-times and intensities from each ear, in circuits located in the superior olivary complex and the trapezoid bodies which are connected via pathways to both ears. (wikipedia.org)
Sensory2
The ear is a sensory Sensory Neurons which conduct nerve impulses to the central nervous system. (lecturio.com)
The ear is the sensory organ responsible for hearing and the maintenance of equilibrium, via the detection of body position and of head movement. (cloudaccess.net)
An ear is the organ that enables hearing and (in mammals) body balance using the vestibular system. (wikipedia.org)
The ear is a very complex network of structures which contribute both to our sense of hearing as well as balance, i.e the vestibular system. (mskneurology.no)
Muscles2
Two sets of muscles are associated with the outer ear: the intrinsic and extrinsic muscles. (wikipedia.org)
The ear muscles are supplied by the facial nerve, which also supplies sensation to the skin of the ear itself, as well as to the external ear cavity. (wikipedia.org)
Canal3
The tragus protrudes and partially obscures the ear canal, as does the facing antitragus. (wikipedia.org)
The skin surrounding the ear canal contains ceruminous and sebaceous glands that produce protective ear wax. (wikipedia.org)
Ectoderm1
The ear develops from the first pharyngeal pouch and six small swellings that develop in the early embryo called otic placodes, which are derived from ectoderm. (wikipedia.org)
Bony labyrinth1
They are set at right angles to each other and are situated posterosuperior to the vestibule of the bony labyrinth (vestibular labyrinth). (lecturio.com)
Middle4
The deepest of the depressions is situated near its middle, and is named the concha auriculæ. (co.ma)
1 Although it is usual to speak of the external, middle, and internal ear, it would be more correct to use the terms external, middle, and internal portions of the ear. (co.ma)
There are three main segments of the ear, namely the external, middle and inner portions. (mskneurology.no)
Otic vesicle Vesicle Primary Skin Lesions is filled with endolymphEndolymph The lymph fluid found in the membranous labyrinth of the ear. (lecturio.com)
External1
Since the outer ear is the only visible portion of the ear in most animals, the word "ear" often refers to the external part alone. (wikipedia.org)
Neck1
The processus anterior, a slender spicule, springs from the front of the neck and is directed forwards, towards the petro-tympanic fissure. (co.ma)
Organ1
The ear is a self cleaning organ through its relationship with earwax and the ear canals. (wikipedia.org)
Either side1
The ears of vertebrates are placed somewhat symmetrically on either side of the head, an arrangement that aids sound localization. (wikipedia.org)
Infection1
The ear may be affected by disease, including infection and traumatic damage. (wikipedia.org)
Body1
The body and crus breve are situated in the recessus epitympanicus. (co.ma)
Lies1
the outer ear lies outside the skull, while the other two parts are embedded in the temporal bone (figure 1). (cloudaccess.net)