Spinal accessory nucleus
(重定向自Accessory nucleus)



The spinal accessory nucleus lies within the cervical spinal cord (C1-C5) in the posterolateral aspect of the anterior horn. The nucleus ambiguus is classically said to provide the "cranial component" of the accessory nerve.
However, the very existence of this cranial component has been recently questioned and seen as contributing exclusively to the vagus nerve.