Which Extraembryonic membrane develops into the placenta?
chorion frondosum
The chorion frondosum ultimately develops into the placenta. The mature placenta consists of the wall of the chorion (the chorionic plate) and numerous villi protruding from it. The fetal surface of the placenta is smooth and shiny because of the apposed amniotic membrane.
What forms the fetal portion of the placenta?
The fetal portion of the placenta is known as the villous chorion. The maternal portion is known as the decidua basalis. The two portions are held together by anchoring villi that are anchored to the decidua basalis by the cytotrophoblastic shell.
Which of the following are the Extraembryonic membranes involved in placenta formation?
The extraembryonic membranes consist of the chorion (the combination of trophoblast plus underlying extraembryonic mesoderm), amnion, yolk sac, and allantois.
Where do fetal membranes and placenta develop from?
The fetal membranes are derived from the embryoblast layer (inner cell mass) of the implanting blastocyst. The trophoblast layer differentiates into amnion and the chorion, which then comprise the fetal membranes.
What does the Allantois develop into?
In placental mammals, the allantois is part of and forms an axis for the development of the umbilical cord. The embryonic allantois becomes the fetal urachus, which connects the fetal bladder (developed from cloaca) to the yolk sac. The urachus removes nitrogenous waste from the fetal bladder.
What is cytotrophoblast and syncytiotrophoblast?
The syncytiotrophoblast is a rapidly growing multinucleated mass, which invades and ruptures endometrial capillaries forming lacunae. The cytotrophoblast is a layer of mononucleated cells, which invades the syncytiotrophoblast matrix and forms early chorionic villi.
What does the chorion develop from?
The chorion is derived from trophoblastic ectoderm and extraembryonic mesoderm (somatopleure). There is an intimate association between the forming chorion and amnion. These form by folding in domestic animals and by so-called cavitation in humans, mice, and rats.
What does the chorion do?
The chorion has two main functions: protect the embryo and nurture the embryo. To protect the embryo, the chorion produces a fluid known as chorionic fluid. The chorionic fluid lies in the chorionic cavity, which is the space between the chorion and the amnion.
What does the allantois develop into?
Which of the following are the extra-embryonic membranes?
There are four extra-embryonic membranes commonly found in VERTEBRATES, such as REPTILES; BIRDS; and MAMMALS. They are the YOLK SAC, the ALLANTOIS, the AMNION, and the CHORION. These membranes provide protection and means to transport nutrients and wastes.
Where does the maternal part of the placenta go?
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.
Which is a part of the extraembryonic membrane?
The extraembryonic membranes consist of the chorion (the combination of trophoblast plus underlying extraembryonic mesoderm), amnion, yolk sac, and allantois. The amnion, a thin ectodermal membrane lined with mesoderm, grows to enclose the embryo like a balloon.
Where does oxygen and waste products enter the placenta?
Oxygen and nutrients in the maternal blood in the intervillous spaces diffuse through the walls of the villi and enter the fetal capillaries. Carbon dioxide and waste products diffuse from blood in the fetal capillaries through the walls of the villi to the maternal blood in the intervillous spaces.
How is amniotic fluid produced in the placenta?
Amniotic Fluid. Amniotic fluid is produced by dialysis of maternal and fetal blood through blood vessels in the placenta. Later, production of fetal urine contributes to the volume of amniotic fluid and fetal swallowing reduces it. The water content of amniotic fluid turns over every three hours.