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The placenta is the container that keeps the baby isolated from the mother. The fetal blood flows through the baby, out the umbilical cord to the placenta and no further. The placental membrane separates maternal blood from fetal blood.Oxygen and nutrients in the maternal blood in the intervillous spaces diffuse through the walls of the villi and enter the fetal capillaries.he fetal blood flows through the baby, out the umbilical cord to the placenta and no further. The placental membrane separates maternal blood from fetal blood. Oxygen and nutrients in the maternal blood in the intervillous spaces diffuse through the walls of the villi and enter the fetal capillaries.
What are the two parts of the placenta. Fetal part of the placenta, formed by the villous chorion, its villi project into the intervillous space containing maternal blood. Maternal part of the placenta, formed by the decidua basalis. By the end of the fourth month the decidua basalis is replaced by the fetal part of the placenta. What connects the fetal and the maternal portion of the placater together. The fetal part of the placenta, is attached to the maternal part by the cytotrophoblastic shell, the external layer of trophoblastic cells on the maternal surface of the placenta.