SINCE 1828
spinal accessory nucleus
nounMedical Definition of spinal accessory nucleus
: a cluster of motor neurons in the ventral horn of the cervical region of the spinal cord that give rise to the accessory nerve
The spinal accessory nerve contains axons of motor neurons whose cell bodies are located in the spinal accessory nucleus …— John H. Martin, Neuroanatomy: Text and Atlas, 2003
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