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Accessory Nerve

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accessory nerve [ak′ses·ə·rē ‚nərv]
(neuroscience)
The eleventh cranial nerve in tetrapods, a paired visceral motor nerve; the bulbar part innervates the larynx and pharynx, and the spinal part innervates the trapezius and sternocleidomastoid muscles.

Nerve, Accessory 

(nervus accessorius, or nerve of Willis, after the English physician T. Willis, who first described it in 1664), the 11th pair of cranial nerves.

The accessory nerve originates in the medulla oblongata and the spinal cord. It emerges from the cranial cavity with the glossopharyngeal and vagus nerves through the jugular foramen and supplies motor fibers to the sternocleidomastoid muscle on the neck (with unilateral contraction, this muscle inclines the head to the side and turns the face in the opposite direction) and to the trapezius muscle on the back (it raises the pectoral girdle and adducts the scapula). Some of the fibers of the accessory nerve are connected to the vagus nerve and with its branches reach the muscles of the soft palate, the pharynx, and the larynx.



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Spinal accessory nerve affecting the scapulae had major involvement and minimal motor function.
The spinal accessory nerve came out Thursday at the hands of Brion Benninger, a surgeon at Oregon Health and Science University, for use in the school's neurological studies - research that could expand what we know about the human brain.
These include cutaneous branches of the cervical plexus supplying the skin overlying the posterior triangle; the platysma and omohyoid muscles; the spinal accessory nerve, which innervates the SCM and trapezius muscles; the deep cervical lymph nodes; the brachial plexus; and numerous arteries and veins--prominent is the external jugular vein (see Figure 2).
 
 
 
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