Upper esophageal sphincter

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Overview

Upper esophageal sphincter
Musculusconstrictorpharyngisinferior.png
Muscles of the pharynx and cheek. (Constrictor pharyngis inferior visible at bottom left.)
Gray994.png
Sagittal section of nose mouth, pharynx, and larynx. (Upper esophageal sphincter not labeled, but region is visible.)
MeSH Upper+Esophageal+Sphincter
Dorlands/Elsevier s_18/12748533

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The upper esophageal sphincter (UES) refers to the superior portion of the esophagus.

Unlike the lower esophageal sphincter, it is comprised of striated muscle and is under conscious control. The primary muscle of the UES is the cricopharyngeus portion of the inferior pharyngeal constrictor.[1]

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.



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