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1. (n.) accessory nerve
either one of the 11th pair of cranial nerves found only in mammals, composed of motor fibers that function in speech and swallowing.
Etymology: (1835–45)
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| Definition of 'accessory nerve' |
Princeton's WordNet |
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1. (noun) accessory nerve, spinal accessory, nervus accessorius, eleventh cranial nerve
arises from two sets of roots (cranial and spinal) that unite to form the nerve
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| Definition of 'accessory nerve' |
U.S. National Library of Medicine |
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1. accessory nerve
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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Definitions of accessory nerve 
