Vaginal portion of cervix

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Vaginal portion of cervix
Illu female pelvis.jpg
Posterior half of uterus and upper part of vagina. (Vaginal portion of cervix visible but not labeled.)
Latin portio vaginalis cervicis
Gray's p.1260
Anatomical terminology

The vaginal portion of the cervix (also called the portio or extocervix) projects free into the anterior wall of the vagina between the anterior and posterior fornices vaginae.

On its rounded extremity is a small, depressed, somewhat circular aperture, the external orifice of the uterus, through which the cavity of the cervix communicates with that of the vagina.

The external orifice is bounded by two lips, an anterior and a posterior, of which the anterior is the shorter and thicker, although, on account of the slope of the cervix, it projects lower than the posterior. Normally, both lips are in contact with the posterior vaginal wall.

A normal cervix of an adult viewed using a bivalved vaginal speculum. The functional squamocolumnar junction surrounds the external os and is visible as the irregular demarcation between the lighter and darker shades of pink mucosa

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