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;
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.
Does the placenta perform circulation?
The placenta accepts the blood without oxygen from the fetus through blood vessels that leave the fetus through the umbilical cord (umbilical arteries, there are two of them). When blood goes through the placenta it picks up oxygen.
How does blood circulate through the placenta?
Oxygen and nutrients from the mother’s blood are transferred across the placenta to the fetus through the umbilical cord. This enriched blood flows through the umbilical vein toward the baby’s liver. There it moves through a shunt called the ductus venosus. This allows some of the blood to go to the liver.
What is 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.
Does the placenta remove waste?
The placenta is an organ that develops in your uterus during pregnancy. This structure provides oxygen and nutrients to your growing baby and removes waste products from your baby’s blood. The placenta attaches to the wall of your uterus, and your baby’s umbilical cord arises from it.
Which organ is bypassed by the special circulation pathways of a fetus?
Fetal circulation bypasses the lungs via a shunt known as the ductus arteriosus; the liver is also bypassed via the ductus venosus and blood can travel from the right atrium to the left atrium via the foramen ovale.
Is the intervillous space maternal?
Definition. 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.
How is the intervillous space 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 …
Where does the waste from the placenta go?
Through the blood vessels in the umbilical cord, the fetus receives all the necessary nutrition, oxygen, and life support from the mother through the placenta. Waste products and carbon dioxide from the fetus are sent back through the umbilical cord and placenta to the mother’s circulation to be eliminated.
When does the placenta develop in the intervillous space?
The presence of trophoblast plugs in the spiral arteries, and absence of maternal blood flow in the intervillous space, also means that the placenta and embryo develop in a physiologically normal low-oxygen environment during the first trimester, which may have important ramifications for embryonic and placental development as discussed later.
Where does maternal blood enter the intervillous space?
The human placenta is a hemochorial, villous type where the maternal blood enters the intervillous space via the spiral arteries and flows directly around the terminal villi of the fetal circulation without any intervening maternal vessel wall.
How much blood is exchanged in the placental circulation?
The flow of the placental blood amounts to 600 cm3/min and the pressure in the spiral arteries to 70 mm Hg. 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.
How often does maternal blood perfuse the placental space?
The low-resistance of uteroplacental vessels and the gradient of blood pressure between uterine arteries and placental intervillous space allow the maternal blood to perfuse the intervillous space efficiently and effectively. The blood in the intervillous space is therefore completely exchanged two to three times per minute.
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