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incompetent cervix a uterine cervix abnormally prone to dilate in the second trimester of pregnancy, resulting in premature expulsion of the fetus. cervix uÂ´teri , uterine cervix the narrow lower end of the uterus, between the isthmus and the opening of the uterus into the vagina.
Know where your cervix is located. The cervix is the lowermost part of the uterus, where it connects with the vaginal wall. It is located 3 to 6 inches (7.6 to 15.2 cm) inside the vagina, at the end of the vaginal tunnel. It is shaped like a small donut with a tiny hole in the center. The position and texture of the cervix change throughout the ovulation cycle. 1  The inner canal of the cervix contains glands that secrete vaginal mucus.