What is desidua?

Desidua is a term used in gynecology to describe the endometrium, the inner lining of the uterus, during pregnancy. The desidua is made of specialized cells that form in response to the implantation of a fertilized egg in the uterus. This lining provides nutrients and support to the developing embryo.

During pregnancy, the desidua becomes thicker and more vascularized, allowing it to support the growing fetus. There are three different types of desidua: the decidua basalis, which is located beneath the implanted embryo; the decidua capsularis, which covers the rest of the embryo like a cap; and the decidua parietalis, which lines the rest of the uterus.

At the end of a pregnancy, the desidua is shed along with the placenta during childbirth. Some of the remaining desidua may contribute to postpartum bleeding as the uterus contracts to expel any remaining tissue.