Feb 27, 2023
Extra Embryonic Coelomic Cavity
Placenta formation is an important topic in anatomy, as it is a complex process that involves the development and function of the placenta during pregnancy. The placenta is a vital organ that connects the developing fetus to the mother's uterine wall, allowing for the exchange of nutrients, oxygen, and waste products. The placenta also plays a crucial role in hormone production, immune protection, and fetal development.
In the NEET PG Exam, questions related to placenta formation may be asked to test the student's understanding of the anatomy and physiology of the placenta, as well as its role in fetal development and pregnancy. A thorough understanding of placenta formation is essential for medical students.
Read this blog further to get a quick overview of this important anatomy topic for NEET PG exam preparation.
It covers amniotic cavity and is Contributed by Amniogenic cells [from trophoblast] and Somatopleuric layer of EEM.
It is CONTRIBUTED BY cytotrophoblast that is Syncytiotrophoblast and somatopleuric layer of EEM
It divides the extra embryonic mesoderm into two parts. One towards the yolk sac is called as visceral or splanchnopleuric extra – embryonic mesoderm and beyond that lines the amniotic cavity and outside is called the parietal or somatopleuric extraembryonic mesoderm (towards body wall). Between somatopleuric extraembryonic and visceral/ splanchnic mesoderm is the extra embryonic coelomic cavity. Chorion formed by trophoblast with a somatopleuric layer of extraembryonic mesoderm. Amnion formed by amniogenic cells lining the amniotic cavity and somatopleuric layer of extraembryonic mesoderm. Connecting stalks later become umbilical cord components.
A membranous sac linked to an embryo called the yolk sac is made up of cells from the hypoblast layer of the bilaminar embryonic disc. The yolk sac is a far more common name for this, however the Terminologia Embryologica (TE) also calls it the umbilical vesicle. The yolk sac plays a crucial role in the early blood supply of human embryos, and during the fourth week of embryonic development, a large portion of it is integrated into the primordial gut.
The chorionic villi are small finger-like extensions of placental tissue that have the same genetic makeup as the developing foetus. Depending on the family history and the availability of lab testing at the time of the surgery, testing may be available for further genetic abnormalities and illnesses.
|PRIMARY VILLUS [Day 12]
|Core of cytotrophoblast cells, covered by syncytio TB
|SECONDARY VILLUS [Day 13-15]
|Cytotrophoblast layer invaded by extra Embryonic mesoderm
|TERTIARY VILLUS [Day 17-21]
|Fetal blood vessels invades the mesoderm
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