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The hiatus is an opening in the diaphragm (a muscle separating the abdomen and chest) that the esophagus or swallowing tube passes through to reach the stomach. If the hiatus weakens and stretches, part of the stomach and/or the esophagus can squeeze into the chest cavity, producing a hiatal hernia.
esophageal hiatus. Type:Term. Definitions. 1. the opening in the right crus of the diaphragm, between the central tendon and the aortic hiatus and at the level of vertebra T10, through which the esophagus and the two vagus nerves pass. Synonyms. hiatus esophageus , esophageal opening.