SPINAL ACCESSORY NERVE
\spˈa͡ɪnə͡l ɐksˈɛsəɹˌi nˈɜːv], \spˈaɪnəl ɐksˈɛsəɹˌi nˈɜːv], \s_p_ˈaɪ_n_əl ɐ_k_s_ˈɛ_s_ə_ɹ_ˌi n_ˈɜː_v]\
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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.
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