What is the purpose of the Intervillous spaces of the placenta?

What is the purpose of the Intervillous spaces of the placenta?

Exchange of oxygen and nutrients take place as the maternal blood flows around terminal villi in the intervillous space. The in-flowing maternal arterial blood pushes deoxygenated blood into the endometrial and then uterine veins back to the maternal circulation.

What is an Intervillous space?

Intervillous space is the space usually occupied by the maternal blood between the villi beyond the syncytiotrophoblast layer, with the chorionic plate and the decidual surfaces forming the other borders.

What is found within the Intervillous space of the human placenta?

Evaluation of the Placenta The intervillous space is normally filled with maternal blood and a small amount of fibrin, with the villi evenly spaced; neighboring villi usually do not touch one another. When fibrin entirely encases a villus, the villous syncytiotrophoblast covering gradually degenerates.

What are trophoblastic lacunae?

trophoblastic lacunae: Spaces in the early syncytiotrophoblastic layer of the chorion present prior to the development of the villi. vitelline veins: Veins that drain blood from the yolk sac.

Is the intervillous space maternal?

In the placenta, the intervillous space is the space between chorionic villi, and contains maternal blood.

What is Intervillous thrombus?

Abstract. Intervillous thrombus (IVT) is a placental pathology of unclear cause. One possible cause is that IVT protects against fetomaternal transfusion due to trophoblastic disruption. A role for hyperglycemia in trophoblast apoptosis has been suggested.

How intervillous space is formed?

With this physiologic destructive process, the maternal blood vessels of the endometrium are opened, with the result that the spaces in the trophoblastic network are filled with maternal blood; these spaces communicate freely with one another and become greatly distended and form the intervillous space from which the …

What does the intervillous space contain?

Where is the intervillous space?

The intervillous space is simply the space between the mother’s blood vessels and the fetal chorionic villi. It is filled with a pool of maternal blood where bathe the villi. This is where all nutrient, gas and waste exchange occur. Varney, Helen.

What is the function of the trophoblastic lacunae?

These lacunae fuse to form lacunar networks. The maternal blood that flows in and out of these networks exchanges nutrients and waste products with the fetus, forming the basis of a primitive uteroplacental circulation.

What does the trophoblast develop into?

Trophoblasts are cells that form the outer layer of a blastocyst, which provides nutrients to the embryo, and then develop into a large part of the placenta. Trophoblast invasion is a critical process in the establishment of a successful pregnancy.

How is the intervillous space formed?

Where are the intervillous spaces found in the placenta?

These spaces are also called intervillous spaces because they are found between the placental villi the finger-like projections of the placenta that contain fetal blood vessels . The placental villi float in the intervillous spaces and absorb oxygen and nutrients from the maternal blood.

Where are the placental lakes located in the placenta?

Placental lakes are enlarged spaces in the placenta filled with maternal blood. These spaces are also called intervillous spaces because they are found between the placental villi the finger-like projections of the placenta that contain fetal blood vessels .

What happens to the lacunae at the end of pregnancy?

At the end of the pregnancy the lacunae communicate with each other and form a single, connected system that is delimited by the syncytiotrophoblast and is termed the intervillous space. Spaces form in the trophoblast (Fig. 18).

How often does maternal blood enter the intervillous space?

In the intervillous spaces the pressure falls to only 10 mm Hg .The blood in the intervillous space is exchanged 2-3 times per minute. Maternal blood arrives at the intervillous space via arteries that open directly into the intervillous space. At the placental level, it thus finds itself temporarily outside the vessel network.