Medical Definition of Mesencephalic nucleus of trigeminal nerve
A long, narrow plate of unipolar neurons extending throughout the length of the midbrain, in and along the lateral angle of the central gray substance. The nucleus is the single known instance of primary sensory neurons enclosed in the central nervous system instead of in a peripheral sensory ganglion. Its peripheral axonal processes pass with the trigeminal nerve, give collaterals to the trigeminal motor nucleus, and terminate in the muscles of mastication.
Synonym: nucleus tractus mesencephali nervi trigemini.
(05 Mar 2000)
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