1. General Characteristics:
- Placental barrier:
- is a thin separating membrane that sits on the chorionic villi,
- provides the exchange of substances between maternal and fetal blood circulation.
2. Structures:
1 - blood filled lacuna,
2 - capillary lumen filled with blood cells,
3 - endothelial cell,
4 - basement membrane,
5 - cytotrophoblast,
6 - syncytiotrophoblast,
7 - connective tissue.