nervus accessorius ner·vu·sac·cessorius uncommon noun 1. arises from two sets of roots (cranial and spinal) that unite to form the accessory nerve trunk Synonymsaccessory nervespinal accessorynervus accessoriuseleventh cranial nerve Related words Broader terms cranial nerve WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
