primary auditory fibre

anatomy

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July 13, 2026

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The primary auditory fibres are the longer, central processes of bipolar neurons that originate from the spiral ganglion within the cochlea. These fibres form the cochlear nerve, which transmits nerve impulses from the hair cells in the organ of Corti to the brainstem.1

These fibres are crucial for hearing, as they convert sound vibrations into electrical signals that the brain interprets as sound. Approximately 95 percent of these fibres innervate the inner hair cells, with the remainder connecting to the outer hair cells. The cochlear nerve then relays these impulses to the brainstem and onward to the primary auditory area of the cerebral cortex, where conscious perception of sound occurs.12

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human ear
Auditory nerve fibres
…central fibres, also called the primary auditory fibres, form the cochlear nerve, and the shorter, peripheral fibres extend to the bases of the inner and outer hair cells. They extend radially from the spiral ganglion to the habenula perforata, a series of tiny holes beneath the inner hair cells. At…
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…central fibres, also called the primary auditory fibres, form the cochlear nerve, and the shorter, peripheral fibres extend to the bases of the inner and outer hair cells. They extend radially from the spiral ganglion to the habenula perforata, a series of tiny holes beneath the inner hair cells. At…
Read More