inferior esophageal sphincter
Definition: a physiologic sphincter at the level of the esophagogastric junction; this is in fact an extrinsic sphincter formed by the surrounding musculature of the esophageal hiatus of the right crus of the diaphragm; causes a normally occurring constriction at the esophagogastric junction observable with a barium swallow.
Synonym(s): sphincter constrictor cardiae
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