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hiatus (hi-a´tәs) Latin word meaning an opening, gap, or cleft. adj., hia´tal, adj. .

aortic hiatus , hiatus aorticus the opening in the diaphragm through which the aorta and thoracic duct pass.

Inferior view of the diaphragm, showing the openings through which the aorta, esophagus, and vena cava pass.

Inferior view of the diaphragm, showing the openings through which the aorta, esophagus, and vena cava pass.

esophageal hiatus , hiatus esophageus the opening in the diaphragm for the passage of the esophagus and the vagus nerves.

pleuroperitoneal hiatus a posterolateral opening in the fetal diaphragm; if it fails to close there is a defect in the diaphragm that may become a site the type of congenital hernia called a Bochdalek hernia. Called also foramen of Bochdalek;

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