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The placental separation model is a sagittal section of the female abdominal and pelvic cavity when the uterine cavity volume and placental attachment surface are reduced after the fetus is delivered, showing the morphological structure of the uterus, vagina, placenta and umbilical cord at this time.
At this time, the bottom of the uterus moves slightly upward and continues to contract, the lower abdomen near the pubic symphysis bulges, and the umbilical cord exposed to the vulva sags (a symbol of placental detachment). Then the central part of the placenta detaches first and descends into the lower part of the uterine cavity first. As the placenta descends, the surrounding fetal membranes separate from the uterine wall, and the outflow from the placental attachment surface is wrapped in the sac formed by the placenta and the fetal membranes. The first thing to appear at the external opening of the vagina is the smooth fetal surface, followed by the fetal membranes being discharged.
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