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Encyclopedia > Vestibulocochlear nerve
Nerve: Vestibulocochlear nerve
The course and connections of the facial nerve in the temporal bone
Gray's subject #203
To cochlear nerve, vestibular nerve
MeSH Vestibulocochlear+Nerve

The vestibulocochlear nerve (also known as the auditory or acoustic nerve) is the eighth of twelve cranial nerves, and is responsible for transmitting sound and equilibrium (balance) information from the inner ear to the brain. Image File history File links Gray789. ... The facial nerve is seventh of twelve paired cranial nerves. ... The temporal bones (os temporales) are situated at the sides and base of the skull. ... The Cochlear nerve (n. ... The vestibular nerve is one of the two branches of the Vestibulocochlear nerve (the cochlear nerve is the other. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Cranial nerves Cranial nerves are nerves that emerge directly from the brain in contrast to spinal nerves which emerge from segments of the spinal cord. ... The inner ear comprises both: the organ of hearing (the cochlea) and the labyrinth or vestibular apparatus, the organ of balance located in the inner ear that consists of three semicircular canals and the vestibule. ... In animals, the brain, or encephalon (Greek for in the head), is the control center of the central nervous system. ...

Contents

Structure

This nerve, along which the sensory cells (the hair cells) of the inner ear transmit information to the brain. It consists of the cochlear nerve, carrying information about hearing, and the vestibular nerve, carrying information about balance. It emerges from the medulla oblongata and enters the inner skull via the internal acoustic meatus (or internal auditory meatus) in the temporal bone, along with the facial nerve. Nerves (yellow) Nerves redirects here. ... Hair cells are the sensory cells of the auditory system that are found within the cochleas organ of Corti. ... The inner ear comprises both: the organ of hearing (the cochlea) and the labyrinth or vestibular apparatus, the organ of balance located in the inner ear that consists of three semicircular canals and the vestibule. ... In animals, the brain, or encephalon (Greek for in the head), is the control center of the central nervous system. ... The Cochlear nerve (n. ... Hearing is one of the traditional five senses, and refers to the ability to detect sound. ... The vestibular nerve is one of the two branches of the Vestibulocochlear nerve (the cochlear nerve is the other. ... For other meanings of the word balance, see: propaganda equilibrium (disambiguation page) sense of balance weighing scale analytical balance (a precise weighing scale) balance beam in gymnastics Balance (song) homeostasis, the biological balance within a human or other animals body When the weights on the plates of this balance... The medulla oblongata is the lower portion of the brainstem. ... It has been suggested that temporal fenestra be merged into this article or section. ... Near the center of the posterior surface of the temporal bone is a large orifice, the internal acoustic meatus (or internal auditory meatus), the size of which varies considerably; its margins are smooth and rounded, and it leads into a short canal, about 1 cm. ... Near the center of the posterior surface of the temporal bone is a large orifice, the internal acoustic meatus (or internal auditory meatus), the size of which varies considerably; its margins are smooth and rounded, and it leads into a short canal, about 1 cm. ... The temporal bones (os temporales) are situated at the sides and base of the skull. ... The facial nerve is seventh of twelve paired cranial nerves. ...


Functions

The eighth cranial nerve has two prime roles. It is needed to convey information of vestibular sensation - that is, the position and movement of the head. Secondly, it is used for hearing. Human Head redirects here. ...


Innervations

The nerve splits into two large divisions - the cochlear nerve and the vestibular nerve. Broadly speaking, the cochlear nerve innervates the cochlea, while the vestibular nerve goes to the vestibular apparatus. The Cochlear nerve (n. ... The vestibular nerve is one of the two branches of the Vestibulocochlear nerve (the cochlear nerve is the other. ... The cochlea is the auditory branch of the inner ear. ... See also Labyrinth, an article treating the mythical maze that imprisoned the Minotaur. ...


Physiology

How hearing information is coded on the nerve has long been a matter of scientific debate between two competing theories, a place theory and a rate theory. Place theory is a theory of hearing which states that our perception of sound depends on where each component frequency produces vibrations along the basilar membrane. ... Rate theory is a theory of hearing which states that our perception of sound depends on the rate at which neurons signal the frequency of each component. ...


Name

Some older texts call the nerve the acoustic or auditory nerve [1], but these terms have fallen out of widespread use because they fail to recognize the nerve's role in the vestibular system. Vestibulocochlear nerve is therefore preferred by most.


Additional images

External links


  Results from FactBites:
 
Vestibulocochlear nerve definition - Medical Dictionary definitions of popular medical terms (128 words)
Vestibulocochlear nerve: A nerve that is responsible for the sense of hearing and which is also pertinent to balance, to the body position sense.
The vestibulocochlear nerve is the eighth cranial nerve.
The 12 cranial nerves, the vestibulocochlear nerve included, emerge from or enter the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral column.
  More results at FactBites »

 
 

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