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opening (o´pәn-ing) a gap or open space; anatomic nomenclature for various types of openings includes aditus, aperture, foramen, fossa, hiatus, inlet, meatus, orifice, ostium, and outlet. aortic opening
the aperture in the diaphragm for passage of the descending aorta. cardiac opening
the opening from the esophagus into the stomach. pulmonary opening
, opening of pulmonary trunk
pulmonary orifice. pyloric opening
the opening between the stomach and duodenum.
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