Internal orifice of the uterus

      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 incorporates text from a public domain edition of Gray's Anatomy.


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      Last modified on 15 March 2013, at 20:56