A cranial nerve that originates from neurons in the medulla and in the cervical spinal cord. [ BIRNLEX:812 http://orcid.org/0000-0002-6601-2165 ]

This is just here as a test because I lose it

Term information

database cross reference

uberon_slim, pheno_slim

latin term
radix spinalis nervus accessorius [ FMA:TA FMA:6720 ]

latin term
nervus accessorius [XI] [ FMA:6720 FMA:TA ]

latin term
pars spinalis nervus accessorius [ FMA:6720 FMA:TA ]


A cranial nerve that originates from neurons in the medulla and in the cervical spinal cord.

depicted by


dubious for taxon


external definition

A small motor nerve which emerges from the lateral wall of the medulla with the roots of the vagus nerve, and innervates a single pectoral suspensory muscle, the m.cucullaris.

Cranial nerve that innervates the sternocleidomastoid and trapezius complex of muscles. [Bemis_WE, Functional_Anatomy_of_the_Vertebrates:_An_Evolutionary_Perspective, Glossary_G-1, Grande_L, Liem_KF, Third_Edition_(2001)_Orlando_Fla.:_Harcourt_College_Publishers, Walker_WF][VHOG]

Small motor nerve which innervates a single pectoral suspensory muscle, the m. cucullaris.[AAO]

external ontology notes

FMA has distinct cranial and spinal parts - WP says 'Traditional descriptions of the accessory nerve divide it into two parts: a spinal part and a cranial part.[1] However, because the cranial component rapidly joins the vagus nerve, becoming an integral part of said nerve, modern descriptions often consider the cranial component to be part of the vagus nerve and not part of the accessory nerve proper.[2]

has exact synonym

cranial nerve XI

pars spinalis nervus accessorius

nervus accessorius [XI]

spinal part of accessory nerve

Willis' nerve

spinal accessory nerve

cervical accessory nerve

radix spinalis nervus accessorius

accessory XI nerve

spinal accessory nerve tree

accessory XI

accessory nerve

accessory nerve [XI]

eleventh cranial nerve

has related synonym

accessory spinal nerve


homology notes

Cranial nerves XI and XII evolved in the common ancestor to amniotes (non-amphibian tetrapods) thus totalling twelve pairs.[well established][VHOG]



taxon notes

In mice, the spinal branch of this motor nerve innervates the trapezius and the sternocleidomastoid muscles. The cranial branch joins the vagus nerve and innervates the same targets as the vagus nerve