Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Upper esophageal sphincter
Introduction
Overview
Overview
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]