Internal orifice of the uterus
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| Internal orifice of the uterus | |
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| Posterior half of uterus and upper part of vagina. | |
| Latin | orificium internum uteri |
| Gray's | subject #268 1259 |
| Dorlands/Elsevier | o_06/13554423 |
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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