About The Medical Condition Accessory Nerves, Spinal
Find the definition of the medical term Accessory Nerves, Spinal. Accessory Nerves, Spinal defined and explained for easy understanding at the Medical Conditions from ClusterMed.info.
Accessory Nerves, Spinal
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What's The Definition Of The Medical Condition Accessory Nerves, Spinal?
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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