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n cochlearis
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Diagrammatic longitudinal section of the cochlea (Cochlear nerve is in center, shown as striped)
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Part of the cochlear division of the Acoustic Nerve , highly magnified
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Vestibulocochlear Nerve
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The is one of the two branches of the
Vestibulocochlear Nerve (the
Vestibular Nerve is the other.)
The cochlear nerve arises from cells in the spiral ganglion of the cochlea. The peripheral fibers pass on to the hair cells of the cochlea, and the central fibers course through the canal of the modiolus and continue to the
Internal Auditory Meatus .
Axons of the cochlear nerve
Synapse in the
Cochlear Nucleus . Cells in the
Ventral Cochlear Nucleus then synapse on cells of the
Superior Olive s (superior olivary complex) of the
Pons on the same side and on the opposite side. These cells compare the timing of impulses from the left and right ears, allowing for
Auditory Localization . Superior olive cells' axons form part of a fibre tract, the
Lateral Lemniscus , and go to the
Inferior Colliculus in the tectum. Cells in the
Dorsal Cochlear Nucleus send axons directly via the trapezoid bodies and lateral lemniscus to the inferior colliculus. Dorsal cochlear nucleus cells carry information about the frequency of sounds. Axons of the inferior colliculus synapse on the
Medial Geniculate Nucleus of the
Thalamus on the same side and on the opposite side. Axons of medial geniculate neucleus cells project to the
Primary Auditory Cortex , also known as
A1 .
Some reflex fibers pass on to the motor nuclei of the eye musculature and other motor nerve nuclei of cranial and spinal nerves via the tectospinal and tectobulbar tracts.
