Medical Definition of accessory nucleus
1: spinal accessory nucleus The accessory nucleus is located at spinal levels C1 to about C5/C6 in the lateral portion of the anterior horn.—Duane E. Haines, Lippincott's Illustrated Q&A Review of Neuroscience, 2010
2: accessory olivary nucleus Forelimb stimulation also activated contralateral sites in the dorsal accessory nucleus of the inferior olive …—E. M. Santori et al., Journal of Neuroscience, 1 Feb. 1986
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