The cervix (from the Latin cervix uteri, meaning “neck of the womb”) is the lower, narrow portion of the uterus where it joins with the top end of the vagina. It is cylindrical or conical in shape and protrudes through the upper anterior vaginal wall.  Approximately half its length is visible with appropriate medical equipment; the remainder lies above the vagina beyond view. The cervix has an opening to allow sperm and menstrual fluid to move through.

Photo courtesy of:  beautifulcervix.com 

During menstruation the cervix stretches open slightly to allow the endometrium to be shed. This stretching is believed to be part of the cramping pain that many women experience. Evidence for this is given by the fact that some women’s cramps subside or disappear after their first vaginal birth because the cervical opening has widened. During childbirth, contractions of the uterus will dilate the cervix up to 10 cm in diameter to allow the child to pass through. (from wikipedia)

schematic from wikipedia

BeautifulCervix.com: This website provides  information about women’s fertility and menstrual cycles and showcases photos documenting changes in the cervix and cervical fluid throughout the cycle.

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