The spinal accessory nerve is the eleventh cranial ~nerve~, branching from the trigeminal ~nerve~ and the |spinal cord|, between the first and fourth |cervical vertebrae|. The spinal accessory nerve divides into a number of branches which innervate important structures. These include the cervical ~lymph~ |glands|, the |larynx|, the |pharynx|, and the sternomastoid and |trapezius| muscles.
