Obstetrics and Gynecological Emergencies Reproductive Anatomy and Physiology Fetus-developing unborn baby Uterus-organ in which a fetus grows, responsible for labor and expulsion of infant. The cervix is the neck of the uterus. Birth canal-vagina and lower part of the uterus Placenta-fetal organ through which fetus exchanges nourishment and waste products during pregnancy Umbilical cord-cord that is an extension of the placenta through which fetus receives nourishment while in the uterus Amniotic sac (bag of waters)-the sac that surrounds the fetus inside the uterus Vagina-lower part of the birth canal Perineum-skin area between vagina and anus, commonly torn during Delivery "Bloody show"-mucus and blood that may come out of the vagina as labor begins Crowning-the bulging-out of the vagina, which is opening as the fetus's head or presenting part presses against it Labor-the time and process beginning with the first uterine muscle contraction until delivery of the placenta. Labor can be defined as having three stages. Stage 1 Stage 2 Stage 3
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