Which fetal membrane take part in the formation of placenta in man?

In humans, the placenta is primarily formed from the chorion, which is one of the fetal membranes. The chorion develops from trophoblastic cells and interacts with the maternal endometrium to facilitate nutrient and gas exchange. Additionally, the allantois contributes to the formation of the umbilical cord, linking the fetus to the placenta. Together, these membranes support fetal development throughout pregnancy.