Accessory Nerve


Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.
Related to Accessory Nerve: hypoglossal nerve, cranial root of accessory nerve

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.

References in periodicals archive ?
Shoulder complaints after neck dissection; is the spinal accessory nerve involved?
Shoulder function following partial spinal accessory nerve transfer for brachial plexus birth injury.
Wesselhoeft made no special attempt "to identify the spinal accessory nerve when he performed the cervical node excision, and that the failure to do so, in his opinion, was a deviation from the applicable standard of care.
Anomalous relationship of the spinal accessory nerve to the internal jugular vein.
The majority of patients underwent a selective ND (levels II to V) with preservation of the sternocleidomastoid muscle, internal jugular vein, and spinal accessory nerve as dictated by operative findings.
Functional evaluation of the spinal accessory nerve after neck dissection.
No patient reported any functional impairment on the questionnaire, and no postoperative complication related to facial nerve or accessory nerve function was observed in any patient.
These modifications include techniques to preserve various functionally important anatomic structures, particularly the spinal accessory nerve, the jugular vein, the sternocleidomastoid muscle, and the cervical plexus of the sensory nerves.
Localized treatments have been performed with epoetin alpha in patients on many peripheral nerves including the sciatic nerve, lateral femoral cutaneous nerve and spinal accessory nerves.
Jugular foramen syndrome is characterized by unilateral paralysis of the glossopharyngeal, vagus, and accessory nerves.
At surgery, a large loculated cyst was found that had to be dissected from the internal carotid artery, internal jugular vein, and the vagus and accessory nerves.

Full browser ?