Accessory Nerve

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accessory nerve

[ak′ses·ə·rē ‚nərv]
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.

References in periodicals archive ?
Although Merrell has concluded by recommending shoulder restoration should focus on either a spinal accessory nerve to suprascapular nerve transfer or dual nerve transfer to both suprascapular nerve (SSN) and axillary nerve, the above 2 cases where ICNs were used for SS neurotization achieved 100% M3 or more shoulder abduction.
Accessory nerve function after modified radical and lateral neck dissections.
35] Posttraumatic accessory nerve palsy was successfully diagnosed with ultrasound.
Key Words: Accessory nerve palsy, trapezius muscle, stretch injury, nerve conduction, neuropathic pain
It occurs in all cases after neck dissection with resection of the spinal accessory nerve and in about 22% when the nerve is preserved.
Specifically, all children in this study underwent microsurgical neurolysis of the upper plexus and bypass nerve grafting from C5 or C6 selectively into the upper-trunk divisions and the suprascapular nerve, and four underwent transfer of the spinal accessory nerve into the suprascapular nerve with a short interpositional graft.
The spinal accessory nerve has shown market improvement in head, neck, and shoulder girdle strength and symmetry.
The nerve stimulated is often the spinal accessory nerve, which moves the trapezius muscle, one of the large muscles of the shoulder.
The sternocleidomastoid gets its motor supply from the spinal accessory nerve and the proprioceptive innervation from the cervical spinal nerves.
A) The accessory nerve arising from a cranial nerve (i.

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