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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.
In a non-pregnant woman, the cervix is usually 2 to 3 cm long (~1 inch) and roughly cylindrical in shape. The narrow, central cervical canal runs along its entire length, connecting the uterine cavity and the lumen of the vagina.