atrioventricular orifice

(redirected from Atrioventricular opening)
Also found in: Wikipedia.

atrioventricular orifice

The opening between the atrium and the ventricle on each side of the heart.
See also: 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.

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.
References in periodicals archive ?
3) Opening of the CS lies between the orifice of the inferior venacava, the oval fossa and the vestibule of the atrioventricular opening and is often guarded by a thin, semicircular valve which covers the lower part of the orifice (Thebesian valve).
Following the removal of hearts, they weighted and sizes of left and right ventricular wall thickness and atrioventricular opening diameters of them were measured and recorded.

Full browser ?