dorsal cochlear nucleus


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Related to dorsal cochlear nucleus: posterior acoustic stria

dorsal cochlear nucleus

A nucleus of the special sensory column in the hindbrain. It forms a bump (the acoustic tubercle) on the lateral edge of the floor of the fourth ventricle. Axons of the primary sensory cells in the spiral ganglion (in the cochlea of the inner ear) run in the vestibulocochlear nerve (CN VIII) and synapse in the dorsal and ventral cochlear nuclei. About half of the axons from neurons in the cochlear nuclei cross the midline in a tract called the trapezoid body and then join the uncrossed axons from the contralateral cochlear nuclei. Together, these axons ascend in a tract called the lateral lemniscus to synapse in the inferior colliculus in the midbrain.
See also: nucleus
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