opening

opening /open·ing/ (o´pin-ing) an aperture or open space; anatomic openings may be called aditus, foramen, fossa, hiatus, orifice, or ostium.

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aortic opening 

1. the aperture in the diaphragm for passage of the descending aorta.

2. see under orifice.

cardiac opening  the opening from the esophagus into the stomach.

caval opening  foramen venae cavae.

pyloric opening  the opening between the stomach and duodenum.

saphenous opening  see under hiatus.

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o·pen·ing (p-nng)

n.

1. The act or an instance of becoming unobstructed or of being made to open.

2. An open space that serves as a passage or gap.

3. A breach or aperture.

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opening

an aperture, orifice or open space.

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aortic opening

1. the aperture of the ventricle into the aorta.

2. the aperture in the diaphragm for passage of the descending aorta.

cardiac opening

the opening from the esophagus into the stomach.

pyloric opening

the opening between the stomach and duodenum.