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The cytotrophoblast secretes proteolytic enzymes to break down the extracellular matrix between the endometrial cells to allow finger-like projections of trophoblast to penetrate through. Projections of cytotrophoblast and syncytiotrophoblast pull the embryo into the endometrium until it is fully covered by endometrial epithelium, save for the ...
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.
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.
This core is surrounded by two layers of trophoblasts, the cytotrophoblast and the syncytiotrophoblast. The cytotrophoblast is a layer of mono-nucleated cells that resides underneath the syncytiotrophoblast. [6] The syncytiotrophoblast is composed of fused cytotrophoblasts which then form a layer that covers the placental surface. [6]
Diagram of stages of developing blastocyst in the human until implantation. There are two stages of migration involved in implantation, the first is the migration of the zygote, and the second is the migration of the trophoblast. [13] Fertilization of the oocyte, takes place in the ampulla of the fallopian tube.
The cytotrophoblast contains cuboidal epithelial cells and is the source of dividing cells, and the syncytiotrophoblast is a syncytial layer without cell boundaries. The syncytiotrophoblast implants the blastocyst in the decidual epithelium by projections of chorionic villi , forming the embryonic part of the placenta.
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 inner cell mass (ICM) or embryoblast (known as the pluriblast in marsupials) is a structure in the early development of an embryo.It is the mass of cells inside the blastocyst that will eventually give rise to the definitive structures of the fetus.