Accessory Nerve

**Definition:** The 11th cranial nerve which originates from NEURONS in the MEDULLA and in the CERVICAL SPINAL CORD. It has a cranial root, which joins the VAGUS NERVE (10th cranial) 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.

**Tree numbers:** - A08.800.800.120.060

**Synonyms:** - Cranial Nerve XI - Eleventh Cranial Nerve - Nerve XI - Nervus Accessorius - Spinal Accessory Nerve