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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. 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 ...
The syncytiotrophoblast is composed of fused cytotrophoblasts which then form a layer that covers the placental surface. [6] The syncytiotrophoblast is in direct contact with the maternal blood that reaches the placental surface. It then facilitates the exchange of nutrients, wastes and gases between the maternal and fetal systems.
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.
Syncytiotrophoblasts are large multi-nucleated cells with eosinophilic cytoplasm. They often surround the cytotrophoblasts, reminiscent of their normal anatomical relationship in chorionic villi. Cytotrophoblasts are polyhedral, mononuclear cells with hyperchromatic nuclei and a clear or pale cytoplasm. Extensive hemorrhage is a common finding.
Cytotrophoblasts are the germinating cells that forms the chorion villi and can be differentiated into syncytiotrophoblasts which produce hCG and can intrude to the inner muscle layer of the uterus to help embed the developing embryo, and intermediate trophoblasts which spread throughout the chorion villi to support maternal-fetal circulation.
A cytotrophoblast cap penetrates through the fetus' syncytiotrophoblasts and reaches the maternal decidua, forming the anchoring villus. [1] [3] [4] The cytotrophoblast layer spreads and contacts the cytotrophoblast layers of neighboring anchoring villi, creating a continuous layer called the cytotrophoblastic shell.
Careful review of cell morphology is key to their delineation — while GCCLs show great variation in cell size distributions and morphologies in tumors, choriocarcinomas consistently contain only syncytiotrophoblasts and cytotrophoblasts. [20]