Vestibulocochlear Nerve

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vestibulocochlear nerve

[və¦stib·yə·lə′käk·lē·ər ‚nərv]
(neuroscience)

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.

References in periodicals archive ?
In our case, changes in eye like keratoconjunctivitis sicca or vertical nystagmus as seen in affections of vestibulocochlear nerve were not seen.
The vibration then flows through the snail-shaped labyrinth of the cochlea and rides the vestibulocochlear nerve to the brain, and registers as sound.
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.
If SNHL is present, MRI is usually the preferred study as it better assesses the vestibulocochlear nerve and CNS.
[sup][4] thought hearing loss due to vestibulocochlear nerve involvement seems to be unique for brucellosis and suggested electrophysiological studies (brainstem auditory-evoked potentials) should be performed more commonly to detect subclinical vestibulocochlear nerve involvement, as it may assist in pointing toward the diagnosis of neurobrucellosis.
Bacterial otitis interna can lead to meningitis with bacteria spreading through the vestibulocochlear nerve.
(10) The vestibulocochlear nerve, pathway, and nuclei constitute the central vestibular system.
Bilateral auricular chondritis Nonerosive inflammatory polyarthritis Nasal chondritis Ocular inflammation (conjunctivitis, scleritis, uveitis) Respiratory tract chondritis (laryngeal and tracheal cartilages) Vestibulocochlear dysfunction (hearing loss, tinnitus, and vertigo)
Interferon-alpha-2b/ribavirin-induced vestibulocochlear toxicity with dysautonomia in a chronic hepatitis C patient.
The HRCT scan reveals many types of bony inner ear malformations and MRI scan provides better visualization of the membranous labyrinth and the status of vestibulocochlear nerves.
(2009) Waterjet dissection of the vestibulocochlear nerve: an experimental study Laboratory investigation.
Within the cerebellopontine angle (CPA), the nerve travels anterolaterally into the porus acousticus of the internal auditory canal (IAC), anterior to the vestibulocochlear nerve (Figure 1(b)).