upper esophageal sphincter


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Related to upper esophageal sphincter: lower esophageal sphincter

upper esophageal sphincter

the upper 3 to 5 cm of the esophagus, including the cricopharyngeus muscle, which prevents the aspiration of air from the pharynx esophagus.

upper esophageal sphincter

A sphincter that keeps the opening between the posterior pharynx and the proximal esophagus closed, except during swallowing. It is maintained principally by the cricopharyngeal muscle.
See also: sphincter
References in periodicals archive ?
Abbreviations: ASHA = American Speech-Language-Hearing Association, BOT = base of the tongue, ES = effect size, N-CEP = National Center for Evidence-Based Practice in Communication Disorders, PPW = posterior pharyngeal wall, SM = submental, UES = upper esophageal sphincter, VA = Department of Veterans Affairs.
4) They proposed other potential mechanisms, including (1) functional derangement of the upper esophageal sphincter secondary to the pressure of the endotracheal tube cuff and (2) the use of drugs that impair esophageal motility.
To document the presence of acid in the pharynx of presumed LPR patients, Wiener et al used both an esophageal pH probe and a pH probe placed in the pharynx just above the upper esophageal sphincter.
1,7) It is believed that the primary defect in GERD is lower esophageal dysfunction, whereas the primary defect in LPR might be upper esophageal sphincter dysfunction.
Similarly, using esophageal pH data (even at a proximal esophageal location) to prove the presence or absence of LPR is invalid, because the upper esophageal sphincter (UES) functions as the final barrier against LPR.
30) The proximal probe must be placed just above the upper esophageal sphincter in the hypopharynx.

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