Heuser's membrane
In this article, we will explore the fascinating world of Heuser's membrane. From its origins to its evolution today, this topic has been the subject of constant interest by researchers, academics and enthusiasts. Heuser's membrane has impacted various areas of society in multiple ways, from politics and economics to popular culture and entertainment. Along these lines, we will delve into the different aspects that make Heuser's membrane such a relevant topic today and its role in shaping the contemporary world.
| Heuser's membrane | |
|---|---|
| Details | |
| Days | 12 |
| Gives rise to | extraembryonic coelom |
| Anatomical terminology | |
_relate_the_trophoblast_(T)_to_the_amnion_and_the_secondary_yolk_sac_(YS).png)
Heuser's membrane (or the exocoelomic membrane) is a short lived combination of hypoblast cells and extracellular matrix.[1]
At day 9-10 of embryonic development, cells from the hypoblast begin to migrate to the embryonic pole, forming a layer of cells just beneath the cytotrophoblast, called Heuser's membrane. It surrounds the exocoelomic cavity (primary yolk sac), i.e. it lines the inner surface of the cytotrophoblast. At this point, the exocoelomic cavity replaces the blastocyst cavity.
At days 11 to 12, there is further delineation of the trophoblastic cells giving rise to a layer of loosely arranged cells that inserts between Heuser's membrane and both syncytiotrophoblast and cytotrophoblast.
The Heuser's membrane cells (hypoblast cells) that migrated along the inner cytotrophoblast lining of the blastocoel, secrete an extracellular matrix along the way. Cells of the hypoblast migrate along the outer edges of this reticulum and form the extraembryonic mesoderm (splanchic & somatic); this disrupts the extraembryonic reticulum. Soon pockets form in the reticulum, which ultimately coalesce to form the chorionic cavity (extraembryonic coelom).[2]
References
- ^ "The Second week of Life".
- ^ "Chorion Bilayer - Cellular Development, Function & Anatomy - LifeMap Discovery". discovery.lifemapsc.com. Retrieved 2023-03-19.
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