Internal orifice of the uterus

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Internal orifice of the uterus
Posterior half of uterus and upper part of vagina.
Latin orificium internum uteri
Anatomical terminology

The internal orifice of the uterus (or internal orifice of the cervix uteri or internal os) is an interior narrowing of the uterine cavity. It corresponds to a slight constriction known as the isthmus that can be observed on the surface of the uterus about midway between the apex and base.

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This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

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