After fertilization, what is the new name given to the endometrium?

After fertilization, the name given to the endometrium is Decidua. This term reflects the changes that occur in the uterine lining as it undergoes transformation to support the development of the embryo. The endometrium becomes thicker and more vascularized, creating a suitable environment for implantation and nourishment of the growing embryo.

The decidua is crucial because it allows for the attachment of the embryo to the uterine wall, providing essential nutrients and support during the early stages of pregnancy. This specialized portion of the endometrium will continue to play a significant role throughout pregnancy, particularly in the formation of the placenta.

In contrast, chorion refers to the outermost membrane surrounding the embryo and contributes to the formation of the placenta but is distinct from the decidua. Myometrium is the middle layer of the uterine wall made up of smooth muscle, and it does not change post-fertilization in the same way the endometrium does. The placenta refers to the organ that develops in the uterus during pregnancy, which is formed by both maternal decidua and fetal chorion.