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"Cytotrophoblast" is the name given to both the inner layer of the trophoblast (also called layer of Langhans) or the cells that live there. It is interior to the syncytiotrophoblast and external to the wall of the blastocyst in a developing embryo.
Image showing trophoblast differentiated into the two layers of cytotrophoblast and syncytiotrophoblast during implantation. The trophoblast proliferates and differentiates into two cell layers at approximately six days after fertilization for humans.
Image showing trophoblast differentiated into the two layers of cytotrophoblast and syncytiotrophoblast during implantation. It is the outer layer of the trophoblasts and actively invades the uterine wall, during implantation, rupturing maternal capillaries and thus establishing an interface between maternal blood and embryonic extracellular fluid, facilitating passive exchange of material ...
After implantation, cytotrophoblast is the inner layer of the trophoblast, composed of stem cells which give rise to cells comprising the chorionic villi, placenta, and syncytiotrophoblast. After implantation, syncytiotrophoblast is the outermost layer of the trophoblast.
Extravillous trophoblasts (EVTs), are one form of differentiated trophoblast cells of the placenta.They are invasive mesenchymal cells which function to establish critical tissue connection in the developing placental-uterine interface.
Intermediate trophoblast is a distinct subtype of trophoblastic tissue that arises from the cytotrophoblast. [1] It is sub-categorized by location: [1] Villous intermediate trophoblast: at anchoring villi of trophoblastic column; Implantation site intermediate trophoblast:
Uterine milk is part of the embryotroph. It is a white secretion containing proteins and amino acids that nourishes the embryo during development. The uterine milk is the actual nutritional liquid that feeds the embryo, while the embryotroph is the uterine milk plus the syncytiotrophoblast.
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.