spinal accessory 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 nucleusSee also: nerve

单词	spinal accessory nerve
释义	DictionarySeeaccessory nerveEncyclopediaSeeAccessory Nerve spinal accessory 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 nucleusSee also: nerve AcronymsSeesanitization
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