cranial nerve nucleus nucleus of medulla oblongata accessory XI nerve nucleus EMAPA:37067 FMA:83965 MA:0001033 See also: http://en.wikipedia.org/wiki/Spinal_accessory_nucleus The spinal accessory nucleus lies within the cervical spinal cord (C1-C5) in the ventral 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. The terminology continues to be used in describing both human anatomy, and that of other animals. UBERON:0020358 accessory neural nucleus accessory nucleus of anterior column of spinal cord nucleus accessorius columnae anterioris medullae spinalis nucleus nervi accessorii nucleus of accessory nerve nucleus of the accessory nerve nucleus of the spinal accessory nerve spinal accessory nucleus uberon