EXTERNAL ORIFICE OF THE UTERUS

The 'external orifice of the uterus' (or 'ostium of uterus', or 'external os') is a small, depressed, somewhat circular aperture on the rounded extremity of the vaginal portion of the cervix. Through this aperture, the cervical cavity communicates with that of the vagina.
The external orifice is bounded by two lips, an anterior and a posterior. The anterior is shorter and thicker, though it projects lower than the posterior because of the slope of the cervix. Normally, both lips are in contact with the posterior vaginal wall.

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Additional images

See also

★ Internal orifice of the uterus

External links

★ - "The uterus, uterine tubes and ovary with associated structures."