cranial nerve nucleus nucleus of medulla oblongata accessory XI nerve nucleus See also: Wikipedia:Spinal_accessory_nucleus nucleus of the spinal accessory nerve 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. neuronames:2003 spinal accessory nucleus FMA:83965 UBERON:0020358 EMAPA:37067 accessory nucleus of anterior column of spinal cord Wikipedia:Spinal_accessory_nucleus nucleus nervi accessorii nucleus of accessory nerve nucleus accessorius columnae anterioris medullae spinalis nucleus of the accessory nerve accessory neural nucleus MA:0001033