How was decidua formed?
The decidua is a transient layer that is localized between the fetal membranes and the myometrium and may play a role in the cross-talk between maternal and fetal compartments. It is formed during the secretory phase of the menstrual cycle as a result of elevated ovarian hormones such as estrogen and progesterone.
What are the 3 types of decidua?
After implantation the decidua becomes differentiated into:
- decidua basalis; under the site of implantation.
- decidua capsularis; covering the ovum.
- decidua parietalis or vera; lining the rest of the uterine cavity.
What is decidua embryology?
Anatomical terminology. The decidua is the modified mucosal lining of the uterus (that is, modified endometrium) that forms in preparation for pregnancy. It is formed in a process called decidualization under the influence of progesterone.
When does decidua develop?
The three deciduae in the second month of pregnancy. After the 4th month the growing fetus brings the decidua capsularis into contact with the decidua parietalis. The fusion of the two deciduae leads to the disappearance of the uterine cavity.
Where is the decidua?
uterus
The endometrium (lining of the uterus) of the mother is known as the decidua ( cast off ), consisting of three regions named by location. As the embryo enlarges, the decidua capsularis becomes stretched and smooth. Eventually the decidua capsularis merges with the decidua parietalis, obliterating the uterine cavity.
What is understood by decidua?
1 : the part of the endometrium that in higher placental mammals undergoes special modifications in preparation for and during pregnancy and is cast off at parturition. 2 : the part of the endometrium cast off in the process of menstruation.
What is decidua Slideshare?
1. Decidua • It is endometrium after implantation which is sheded after birth of fetus. • Character of endometrium: • Increased secretory function of uterine glands. • Decidual cells are endometrial cells filled with glycogen.
What is the function of the decidua?
The decidua has been known as maternal uterine tissue, which plays essential roles in protecting the embryo from being attacked by maternal immune cells and provides nutritional support for the developing embryo prior to placenta formation.
What is meant by decidua reaction?
A decidual reaction is a feature seen in very early pregnancy where there is thickening of the endometrium around the gestational sac. A thin decidual reaction of less than 2 mm is considered one of the features suggestive of an anembryonic pregnancy 2.
When does endometrium become decidua?
At 8–10 weeks of gestation, the placental extravillous cytotrophoblast cells (EVCTs) change their adhesion molecule expression and stream out of the placental villi to invade the full thickness of the decidualized endometrium (decidua) and the inner third of the myometrium.
What is the decidua reaction?