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Irina Münstermann

Placenta (English)

Placenta (English)

At the beginning of the fetal period, the placenta has two components: a fetal portion, formed by the chorion frondosum, and a maternal portion, formed by the decidua basalis. On the fetal side, the placenta is bordered by the chorionic plate. On its maternal side, it is bordered by the basal decidua.The placenta is the meeting point of two circulatory systems: fetal circulation and maternal circulation. The maternal component of the placenta contains maternal arteries and veins that feed into the intervillous spaces. On the opposite side, the umbilical arteries and veins form a tree-like structure within the intervillous space. Here, the fetal and maternal blood comes into close contact separated only by a thin membrane, called the placental membrane.
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