The upper esophageal sphincter is a muscular valve that can be found in the upper part of the esophagus. It is also called as the inferior pharyngeal sphincter. It is 8 inches long.
The upper esophageal sphincter is a muscular valve that can be found in the upper part of the esophagus. It is also called as the inferior pharyngeal sphincter. It is 8 inches long.
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