《英文msh詞典》Spinal Accessory Nerves
[入口詞] Spinal Accessory Nerves
[主題詞] Accessory Nerve
[英文釋義] 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.