The placenta contains several cell types, including syncytiotrophoblast, cytotrophoblast, and fetal endothelial cells.
According to the provided reference, transport across the placenta involves these three main cell types:
- Syncytiotrophoblast (STB): This is a multinucleated layer that forms the outer surface of the placenta and is in direct contact with maternal blood.
- Cytotrophoblast (CTB): These cells lie beneath the syncytiotrophoblast. In the early placenta, a continuous layer of cytotrophoblast is present.
- Fetal Endothelial Cells (FECs): These cells line the fetal blood vessels within the placenta.
Therefore, these three cell types are present and play important roles in placental function.
