nucleus ambiguusn.

Brit.

/ˌnjuːklɪəs amˈbɪɡjʊəs/, U.S.

/ˈˌn(j)ukliəs æmˈbɪɡjəwəs/

Origin: A borrowing from Latin. Etymon: Latin nucleus ambiguus.

Etymology: < scientific Latin nucleus ambiguus (1888 or earlier) < classical Latin nucleus nucleus n. + ambiguus (see ambiguous adj.).

Anatomy.

A longitudinal column of cells in the medulla oblongata which supplies motor fibres to the vagus, glossopharyngeal, and accessory nerves (innervating the pharynx and larynx), and parasympathetic fibres to the vagus (innervating the heart).

ΚΠ

1890 A. Hill tr. H. Obersteiner Anat. Central Nerv. Organs v. 216 The groups of large cells which lie midway between the periphery and central canal..are described as constituting the nucleus ambiguus.

1913 Cunningham's Text-bk. Anat. (ed. 4) 596 The cells of the nucleus ambiguus are large, multipolar, and similar in every respect to the large cells in the anterior column of the spinal medulla.

1966 Jrnl. Compar. Neurol. 127 293 The localization, in the nucleus ambiguus of the rabbit, of the cells of origin of motor nerve fibers.

1995 Neurosci. & Biobehavioral Rev. 19 225 In mammals the nucleus ambiguus not only coordinates sucking, swallowing, and breathing, but it also regulates heart rate and vocalizations in response to stressors.

This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022).

单词	nucleus ambiguus
释义	nucleus ambiguusn. Brit. /ˌnjuːklɪəs amˈbɪɡjʊəs/, U.S. /ˈˌn(j)ukliəs æmˈbɪɡjəwəs/ Origin: A borrowing from Latin. Etymon: Latin nucleus ambiguus. Etymology: < scientific Latin nucleus ambiguus (1888 or earlier) < classical Latin nucleus nucleus n. + ambiguus (see ambiguous adj.). Anatomy. A longitudinal column of cells in the medulla oblongata which supplies motor fibres to the vagus, glossopharyngeal, and accessory nerves (innervating the pharynx and larynx), and parasympathetic fibres to the vagus (innervating the heart). ΚΠ 1890 A. Hill tr. H. Obersteiner Anat. Central Nerv. Organs v. 216 The groups of large cells which lie midway between the periphery and central canal..are described as constituting the nucleus ambiguus. 1913 Cunningham's Text-bk. Anat. (ed. 4) 596 The cells of the nucleus ambiguus are large, multipolar, and similar in every respect to the large cells in the anterior column of the spinal medulla. 1966 Jrnl. Compar. Neurol. 127 293 The localization, in the nucleus ambiguus of the rabbit, of the cells of origin of motor nerve fibers. 1995 Neurosci. & Biobehavioral Rev. 19 225 In mammals the nucleus ambiguus not only coordinates sucking, swallowing, and breathing, but it also regulates heart rate and vocalizations in response to stressors. This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022). < n.1890
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