<P> At this point, one may ask how such a wiggle of a hair bundle triggers a difference in membrane potential . The current model is that cilia are attached to one another by "tip links", structures which link the tips of one cilium to another . Stretching and compressing, the tip links may open an ion channel and produce the receptor potential in the hair cell . Recently it has been shown that cadherin - 23 CDH23 and protocadherin - 15 PCDH15 are the adhesion molecules associated with these tip links . It is thought that a calcium driven motor causes a shortening of these links to regenerate tensions . This regeneration of tension allows for apprehension of prolonged auditory stimulation . </P> <P> Afferent neurons innervate cochlear inner hair cells, at synapses where the neurotransmitter glutamate communicates signals from the hair cells to the dendrites of the primary auditory neurons . </P> <P> There are far fewer inner hair cells in the cochlea than afferent nerve fibers--many auditory nerve fibers innervate each hair cell . The neural dendrites belong to neurons of the auditory nerve, which in turn joins the vestibular nerve to form the vestibulocochlear nerve, or cranial nerve number VIII . The region of the basilar membrane supplying the inputs to a particular afferent nerve fibre can be considered to be its receptive field . </P> <P> Efferent projections from the brain to the cochlea also play a role in the perception of sound, although this is not well understood . Efferent synapses occur on outer hair cells and on afferent (towards the brain) dendrites under inner hair cells </P>

Where does the auditory nerve go in the brain
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