Cochlear Nuclear Complex
The axons from each cochlear nerve terminate in the cochlear nuclear complex which are ipsilaterally located in the medulla of the brainstem. The cochlear nucleus is the first 'relay station' of the auditory nervous system and receives mainly ipsilateral afferent input.
The three major components of the cochlear nuclear complex are: (see figure below)
- the dorsal cochlear nucleus (DCN)
- the anteroventral cochlear nucleus (AVCN)
- the posteroventral cochlear nucleus (PVCN)
Each of the three cochlear nuclei are tonotopically organised. The axons from the lower frequency area of the cochlea innervate the ventral portion of the dorsal cochlear nucleus and the ventrolateral portions of the anteroventral cochlear nucleus, while the higher frequency axons project into the dorsal portion of the anteroventral cochlear nucleus and the uppermost dorsal portions of the dorsal cochlear nucleus. The mid frequency projections end up in between the two extremes, in this way the frequency spectrum is preserved.
Read more about this topic: Cochlear Nerve
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