Corpus: Cochlear nuclei
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Synonym: snail seeds, cooked learisk seeds
English:
Definition[Bearbeiten]
The nuclei cochleares are accumulations of nerve cell bodies ("nuclear area") on the dorsolateral side of the brain stem and the medulla oblongata, which represent the first connection station of the auditory pathway. This is where the majority of the fibres cross over to the opposite side.
Neuroanatomy[Bearbeiten]
The afferents (1st order neurons) run in the cochlear nerve (part of the vestibulocochlear nerve), which carries auditory information from the organ of Corti from the inner ear to the brain. The efferents (2nd order neurones) run medially, where they end contralaterally and also ipsilaterally in the corpus trapezoideum and the superior olivary nucleus. From here, 3rd order neurones form the lateral lemniscus.
A distinction is made between two cochlear nuclei that extend from the medulla oblongata to the pons at the base of the rhomboid fossa:
- anterior cochlear nucleus (anterior cochlear nucleus)
- Posterior cochlear nucleus (posterior cochlear nucleus)
The indirect part of the auditory pathway originates from the anterior cochlear nucleus and the direct part from the posterior cochlear nucleus.