orifice

orifice /or·i·fice/ (or´i-fis)

1. the entrance or outlet of any body cavity.

2. any opening or meatus.orific´ial

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aortic orifice  the opening of the left ventricle into the aorta.

cardiac orifice  see under opening.

external urethral orifice  urinary meatus.

left atrioventricular orifice , mitral orifice the opening between the left atrium and ventricle of the heart.

pulmonary orifice , orifice of pulmonary trunk the opening between the pulmonary trunk and the right ventricle.

right atrioventricular orifice , tricuspid orifice the opening between the right atrium and ventricle of the heart.

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or·i·fice (ôr-fs)

n.

An opening, especially to a cavity or passage of the body; a mouth or vent.

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ori·ficial (-fshl) adj.

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orifice (ôr´ifis),

n an older term for the opening, entrance, or outlet of any body cavity; any foramen or meatus.

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orifice

1. the entrance or outlet of any body cavity.

2. any foramen, meatus or opening.

The names of most orifices are self-defining, e.g. atrioventricular, preputial. See also ostium.

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atrioventricular orifice

the opening between the atria and ventricles.

cecocolic orifice

aperture through which the cecum connects with the colon.

ileocolic orifice

the communicating orifice between the ileum and the colon.

infundibular orifice

slit-like orifice at the ovarian end of the avian oviduct; positioned near the ovary so that it can grasp the newly extruded oocyte.

intrapharyngeal orifice

the orifice between the nasopharynx and oropharynx which is bounded by the palatopharyngeal arches.

nasomaxillary orifice

the slit-like opening between the maxillary sinus and the middle meatus of the nasal cavity.

omasoabomasal orifice

large, oval opening at the end of the omasal canal which communicates with the abomasum.

oviductal orifice

a slit-like opening in the avian urodeum.

pyloric orifice

aperture between the stomach and duodenum; opens infrequently, solely for the passage of ingesta.

ureteric orifice

paired orifices in the neck of the bladder.