external cervical os

external cervical os

an external opening of the uterus that leads into the cavity of the cervix. Compare internal cervical os.
References in periodicals archive ?
It is considered complete when it extends to the external cervical os.
Cervical length was determined by the simultaneous visualisation of the internal and external cervical os and their measurement across the endocervical channel.
The distance between the external cervical os and the leading edge of the gestational sac ranged from 7 to 25 mm.
Luigi Selvaggi in Italy were the first, however, to describe the utilization of a vaginoscopic approach to office hysteroscopy for evaluating the endocervical canal and uterine cavity in addition to the vagina and external cervical os.
because of its oblong shape that, when rotated horizontally with the light cord, easily slips into the slit-shaped external cervical os.
The Missouri bill is unique in that it defines a "partially born" infant as one in which "the head in a cephalic presentation, or any part of the torso above the navel in a breech presentation, is outside the mother's external cervical os.

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