What is Decidual Basalis?
The maternal component of the placenta is known as the decidua basalis. � Oxygen and nutrients in the maternal blood in the intervillous spaces diffuse through the walls of the villi and enter the fetal capillaries.
What are the 3 different types of decidua?
The decidua consists of various parts, depending on its relationship with the embryo:
- Decidua basalis, where the implantation takes place and the basal plate is formed.
- Decidua capsularis, lies like a capsule around the chorion.
- Decidua parietalis, on the opposite uterus wall.
What is the purpose of the decidua basalis?
The main functions of the decidua are to regulate syncytiotrophoblast invasion, provide nutrition and gas exchange, and produce hormones. The decidualization of the inner layer of endometrium prepares the uterus for pregnancy, with trophoblast invading into it and spiral arterioles sprouting out of it.
What forms the decidua basalis?
Three morphologically distinct layers of the decidua basalis can then be described: Compact outer layer (stratum compactum) Intermediate layer (stratum spongiosum) Boundary layer adjacent to the myometrium (stratum basalis)
What is the decidua basalis made up of?
placenta
human pregnancy …of cells known as the decidua basalis, the maternal component of the mature placenta; it is cast off when the placenta is expelled. The fetal part of the placenta—the villi and their contained blood vessels—is separated from the decidua basalis by a lakelike body of fluid blood.
What happens to the decidua basalis?
…of cells known as the decidua basalis, the maternal component of the mature placenta; it is cast off when the placenta is expelled.
What are the parts of placenta?
Development
- The placenta is a fetal organ made up of its parenchyma, chorion, amnion, and umbilical cord.
- After fertilization, the fertilized ovum evolves into a morula, which will develop into the embryo and fetal placenta.
Is decidua part of the placenta?
The decidua forms the maternal part of the placenta and remains for the duration of the pregnancy. It is shed off during childbirth—hence why the term is used, “decidua” having the meaning of falling away, as in the word deciduous.
What is the role of 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 are the parts of decidua?
Three morphologically distinct layers of the decidua basalis can then be described:
- Compact outer layer (stratum compactum)
- Intermediate layer (stratum spongiosum)
- Boundary layer adjacent to the myometrium (stratum basalis)
What is Nitabuch’s layer?
Nitabuch membrane a layer of fibrin (fibrinoid material) between the boundary zone of compact endometrium and the cytotrophoblastic shell in the placenta.
What is the decidua basalis of the uterus?
decidua basalis – The term given to the uterine endometrium at the site of implantation where signaling transforms the uterine stromal cells (fibroblast-like) into decidual cells. This forms the maternal component of the placenta, the decidualization process gradually spreads through the remainder of the uterus , forming the decidua parietalis.
What is the decidua parietalis?
The remainder of the decidua is termed the decidua parietalis. The decidua has a histologically-distinct appearance, displaying large polygonal decidual cells in the stroma.
What is the decidua in placenta accreta decidualization?
In invasive placental disorders like placenta accreta decidualization have been consistently found to be deficient. The decidua is shed during the birthing process. The decidua secretes hormones, growth factors, and cytokines. It has receptors for estrogen, progesterone, growth hormone, and others.
What is the function of decidua?
Decidual cells are large with ample cytoplasm, distinct cell borders and small, rounded nuclei. As the maternal interface to the embryo the decidua participates in the exchanges of nutrition, gas, and waste with the gestation.