INTERNAL ORIFICE OF THE UTERUS
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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See also
★ External orifice of the uterus
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