右房室口
右房室口（right atrioventricular orifice）是右心房和右心室之间的巨大椭圆形开口。
右房室口位于心房的底面，直径约4公分长。周围有纤维环环绕，且有衬膜包围。右房室口比起左边大得多。
右房室口周围有三尖瓣包围。
Right atrioventricular orifice
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Right atrioventricular orifice 右房室口
The right atrioventricular orifice (right atrioventricular opening) is the large oval aperture of communication between the right atrium and ventricle.
Situated at the base of the atrium, it measures about 4 cm. in diameter and is surrounded by a fibrous ring, covered by the lining membrane of the heart; it is considerably larger than the corresponding aperture on the left side, being sufficient to admit the ends of four fingers.
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