upper esophageal sphincter
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Upper esophageal sphincter
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
.
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