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Internal orifice of the uterus
Gray1167.svg
Posterior half of uterus and upper part of vagina.
Latin orificium internum uteri
Gray's subject #268 1259

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 was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.








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