《英文msh词典》Nerves,Accessory
[入口词] Nerves,Accessory
[主题词] Accessory Nerve
[英文释义] The 11th cranial nerve. The accessory nerve originates from neurons in the medulla and in the cervical spinal cord. It has a cranial root,which joins the vagus (10th cranial) nerve and sends motor fibers to the muscles of the larynx,and a spinal root,which sends motor fibers to the trapezius and the sternocleidomastoid muscles. Damage to the nerve produces weakness in head rotation and shoulder elevation.