Definitions

lower esophageal sphincter

Upper esophageal sphincter

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.

References

See also

Lower esophageal sphincter

External links

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