The Smith County Veteran Services Office will be closed Monday through Monday, August 15-22, 2016. The Smith County Veterans Service Office will be closed Monday through Monday, August 15-22 for training, and will reopen on Tuesday, August 23 for normal business hours.
The first differentiation event in the formation of the placenta is the formation of trophoblasts, specialized epithelial cells, that ultimately form a physical connection between the embryo and the uterus. Allocation of cells to the trophoblast lineage is dependent on their position at the morula stage.
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.