Placental Barrier the structure between fetal and maternal blood components endothelium of chorion capillary 2 CT in the core of the villus 3)trophoblast epithelium 10 weeks Term cytotrophoblast capillaries syncytiotrophoblastPlacental Barrier --the structure between fetal and maternal blood --components: 1)endothelium of chorion capillary 2) CT in the core of the villus 3) trophoblast epithelium