Normal Histology | Histology Image Gallery | Placenta

The placenta is a complex but interesting organ, with a fetal side and a maternal side. The fetal side consists of villi surrounded by trophoblast and a connective tissue core with vessels. The surrounding trophoblast has a outer syncitiotrophoblast and an inner layer of cytotrophoblast. The core consists of mesenchymal cells. The maternal side consists of a decidual reaction with fibrin deposition. Decidualization is the process of change in the endometrial glands when exposed to progesterone, as in the menstrual cycle. The tissue becomes plump red and thick.

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