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Cochlear nerve
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The cochlear nerve is a branch of the vestibulochochlear nerve (CN VIII). It is a sensory nerve that plays a role in hearing. The cochlear nerve transmits auditory signals from the cochlea of the inner ear to the brainstem.
It is composed of afferent and efferent fibers. The afferent fibers have bipolar cell bodies in the cochlear ganglion in the modiolus. The peripheral processes of these neurons also extend to the spiral organ. The cochlear nerve conveys these afferent sensory fibers from the spiral organ (of Corti) and terminate within the brainstem's cochlear nuclei complex. The cochlear nerve fibers can be classified as type I or type II:
- Type I: project to the inner hair cells of the spiral organ (of Corti). These neurons are large and myelinated. They account for most of the cochlear nerve cells.
- Type II: project to the outer hair cells. They are smaller and unmyelinated.
The function of the cochlear nerve is to relay signals from the hair cells to the auditory centers in the brain.
| Terminology | English: Cochlear nerve Latin: Nervus cochlearis |
| Branches | Cochlear ganglion (spiral ganglion) |
| Function | Relay signals from the hair cells to the auditory centers in the brain |
Learn more about the cochlear nerve in this study unit:
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