Upper esophageal sphincter

Upper esophageal sphincter

Infobox Anatomy
Name = Upper esophageal sphincter
Latin =
GraySubject =
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Caption = Muscles of the pharynx and cheek. (Constrictor pharyngis inferior visible at bottom left.)

Caption2 = Sagittal section of nose mouth, pharynx, and larynx. (Upper esophageal sphincter not labeled, but region is visible.)
Precursor =
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Artery =
Vein =
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Lymph =
MeshName = Upper+Esophageal+Sphincter
MeshNumber =
DorlandsPre = s_18
DorlandsSuf = 12748533
The upper esophageal sphincter (UES) refers to the superior portion of the esophagus.

Unlike the lower esophageal sphincter, it consists of striated muscle and is under conscious control. The primary muscle of the UES is the cricopharyngeus portion of the inferior pharyngeal constrictor. [cite journal |author=Mu L, Wang J, Su H, Sanders I |title=Adult human upper esophageal sphincter contains specialized muscle fibers expressing unusual myosin heavy chain isoforms |journal=J. Histochem. Cytochem. |volume=55 |issue=3 |pages=199–207 |year=2007 |pmid=17074861 |doi=10.1369/jhc.6A7084.2006 |url=http://www.jhc.org/cgi/content/abstract/jhc.6A7084.2006v1]


ee also

Lower esophageal sphincter

External links

* [http://www.merck.com/mmhe/sec09/ch120/ch120a.html Diagram at merck.com]

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