Decidua : pregnant endometrium

Decidua:

Definition : Deciduas means gravid endometrium

Decidua reaction:

 i) cells of the endometrium polyhedral and loaded with glycogen and  lipids

  ii) intercellular spaces are filled with extravasate

  iii) the tissues is edematous

At first it occur at the site of implantation but soon spread throughout the endometrium
 

Parts of deciduas : it is divided into three parts

1.      decidua basalis : parts of decidua deep to the developing embryo which contributes to the development of placenta

2.      decidua capsularis : part of decidua which surround the embryo and it is separated from the uterine cavity

3.      decidua parietalis : rest of the decidua excluding decidua basalis and decidua capsularis