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| Accessory Nerve Cranial Nerve XI | Eleventh Cranial Nerve | Spinal Accessory Nerve | Accessory Nerve, Spinal | Accessory Nerves | Accessory Nerves, Spinal | Cranial Nerve, Eleventh | Cranial Nerves, Eleventh | Eleventh Cranial Nerves | Nerve, Accessory 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. |