Vestibulocochlear Nerve


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vestibulocochlear nerve

[və¦stib·yə·lə′käk·lē·ər ‚nərv]
(neuroscience)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Vestibulocochlear Nerve

 

in man, the eighth pair of cranial nerves.

The nerve copsists of two functional parts— the vestibular, which is the conductor of the impulses from the organ of equilibrium, and the cochlear, which perceives auditory stimuli. The vestibular part begins from the vestibular ganglion, which lies on the floor of the internal auditory canal. The peripheral processes of the nerve cells of that ganglion approach the receptor elements of the sacculus, utriculus, and ampulla of the membranous semicircular canals of the inner ear. The cochlear part originates from the spiral ganglion at the base of the bony plate of the cochlea. The peripheral processes of the cells of that ganglion enter into close contact with the receptor apparatus of the spiral organ (organ of Corti), which is located along the entire length of the cochlear canal of the membranous labyrinth. The central processes of the vestibular and spiral ganglia emerge from the inner ear and, as the corresponding parts of the nerve, are directed to the base of the brain. Outside the olivary nucleus of the medulla oblongata the central processes enter the base of the brain and, after uniting, reach their nuclei, which are localized in the corners of the rhomboid fossa.

With infectious or traumatic disorders of the fibers of the cochlear portion of the vestibulocochlear nerve, hearing disorders and even deafness may result. When there are disturbances of the vestibular portion, there is disruption of equilibrium and dizziness.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Intense enhancement of the facial and vestibulocochlear nerves can be seen in the IAC (Figure 14).
Maximum malformations found in a single ear were 7 structural malformations which included malformation of cochlea, modiolus, vestibule, vestibular aqueduct, semicircular canals, internal auditory canal, and vestibulocochlear nerve. Five out of 78 (6.4%) malformed inner ears showed all 7 structural malformations, 6 ears (7.6%) had 6 malformations, 7 ears (8.9%) had 5 malformations, 15 ears (19.2%) showed 4 malformations, 19 ears (24.3%) had 3 malformations, 23 ears (29.4%) had 2 malformations, and only 3 ears (3.8%) had single isolated malformation.
Anomaly of the vestibulocochlear nerve occurred along with a malformed labyrinth.
Rosahl, "Vertigo and tinnitus caused by vascular compression of the vestibulocochlear nerve, not intracanalicular vestibular schwannoma: review and case presentation," Skull Base, vol.
Thus, a 1.5-Tesla magnetic resonance imaging (MRI) was performed, and constructive interference in steady-state sequences using the T2-weighted three-dimensional gradient-echo technique showed a signal intensity difference between the left side and the unaffected right side, as well as adhesion around the facial and vestibulocochlear nerve complex at the fundus of the internal acoustic canal.
Vestibular schwannomas arise from Schwann cells on branches of the vestibulocochlear nerve, most commonly the superior vestibular nerve.
The tumor measured 30 mm in the transverse diameter and had characteristic, cystic, and nodular components, dislocating the vestibulocochlear nerve (Figure 1).
Her vestibulocochlear nerve could not be assessed as she could not comply to the instructions given to her.
Certain demyelinating neurologic diseases, many of which have an immunologic basis, result in retro-cochlear hearing deficits as a result of the involvement of the vestibulocochlear nerve and/or the brainstem auditory pathways.
(1) Vestibulocochlear nerve involvement may occur in severe cases leading to sensorineural hearing loss in 10% and vestibular symptoms in 40% patients.
The cranial MRI revealed diffuse thickening of the cisternal and cavernous segments of bilateral oculomotor nerves and the cisternal and canalicular segments of bilateral facial and vestibulocochlear nerves. Also, cranial MRI demonstrated the infiltration of the hypophyseal infundibular stalk.
Anastomoses between lower cranial and upper cervical nerves: a comprehensive review with potential significance during skull base and neck operations, part I: trigeminal, facial, and vestibulocochlear nerves. Clin.