Internal orifice of the uterus

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Internal orifice of the uterus
Gray1167.svg
Posterior half of uterus and upper part of vagina.
Details
Latin orificium internum uteri
Identifiers
Gray's p.1259
Dorlands
/Elsevier
o_06/13554423
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 from a public domain edition of Gray's Anatomy.