Early placenta

Placenta can be identified from recognition of structures of its maternal, decidua basalis, and foetal parts   - chorionic plate (most slides show at least one of these components) and of structures of the intervillous space. This space is hidden between both plates, contains the maternal blood, chorionic villi and rare decidual septa. Decidual septa consist of relatively large polygonal decidual cells with a pale cytoplasm. Chorionic villi have specific structure. Their placental barrier in the early placenta is formed by the syncytiotrophoblast, almost continuous cytotrophoblast, mesenchymal connective tissue and endothelium of blood vessels (blood vessels are not numerous and occur in the central part of each villus).