"The accessory nerve is a cranial nerve that controls the sternocleidomastoid and trapezius muscles. As part of it was formerly believed to originate in the brain, it is considered the eleventh of twelve cranial nerves, or simply cranial nerve XI.Traditional descriptions of the accessory nerve divide it into two parts: a spinal part and a cranial part."@en . "nervus accessorius"@en . . . . "913"^^ . "A08.800.800.120.060" . "206"^^ . . "Accessory+Nerve"@en . "Accessory nerve"@en .