atrioventricular orifice

(redirected from Atrioventricular opening)
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atrioventricular orifice

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

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