spinal accessory nerve


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Related to spinal accessory nerve: transverse cervical artery, Dorsal scapular nerve

ac·ces·so·ry nerve [CN XI]

[TA]
nerve that arises by two sets of roots: the presumed cranial, emerging from the side of the medulla, and the presumed spinal, emerging from the ventrolateral part of the first five cervical segments of the spinal cord; these roots unite to form the accessory nerve trunk, which divides into two branches, internal and external; the internal branch, carrying fibers of the cranial root, unites with the vagus in the jugular foramen and supplies the muscles of the pharynx, larynx, and soft palate; the external branch continues independently through the jugular foramen to supply the sternocleidomastoid and trapezius muscles. Even though the accessory nerve was originally believed to have cranial and spinal roots, it is now the general view that the so-called cranial root is actually a portion of the vagus nerve.
Synonym(s): nervus accessorius [CN XI] [TA], accessorius willisii, eleventh cranial nerve [CN XI], spinal accessory nerve

spinal accessory nerve

A motor nerve originating in the nucleus ambiguus in the medulla and in a column of motor neurons in the ventral horn of the upper cervical spinal cord. After exiting the skull through the jugular foramen, the nerve splits; its cranial trunk joins the vagus (CN X) and innervates striated muscles in the soft palate, pharynx, larynx, and esophagus; its spinal trunk continues down the neck to innervate the sternocleidomastoid and trapezius muscles.
Synonym: accessory nerve; eleventh cranial nerve See: spinal accessory nucleus
See also: nerve
References in periodicals archive ?
Traumatic lesions of the spinal accessory nerve. II: clinical study and results of a series of 25 cases.
Spinal accessory nerve palsy following blunt trauma.
Stretch palsy of the spinal accessory nerve. Case report.
(15.) Lunardi p Mastronardi L, Farah JO, De Biase C, Trasimeni G, Gualdi GF Spinal accessory nerve palsy due to neurovascular compression.
Spinal accessory nerve palsy: an unusual complication of coronary artery bypass.
Stretch-induced spinal accessory nerve palsy: a case report.
Impairment of upper trapezius branch of the spinal accessory nerve during bypass grafting: a stretch injury?
Fenestration of internal jugular vein and relation to spinal accessory nerve: Case report and review of the literature.
Dissection and removal of the level II-B lymph nodes requires an extensive dissection and mobilization of the proximal portion of the spinal accessory nerve (SAN).
The most disturbing sequela of traditional radical neck dissection is loss of shoulder function as a result of a resection of the spinal accessory nerve and denervation of the trapezius muscle.