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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.
After blastulation, the trophoblast is contiguous with the ectoderm of the embryo and is referred to as the trophectoderm. [4] After the first differentiation, the cells in the human embryo lose their totipotency because they can no longer form a trophoblast. They become pluripotent stem cells.
In the placenta, the intervillous space is the space between chorionic villi, and contains maternal blood.. The trophoblast, which is a collection of cells that invades the maternal endometrium to gain access to nutrition for the fetus, proliferates rapidly and forms a network of branching processes which cover the entire embryo and invade and destroy the maternal tissues.
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.
A blastocyst is implanted five to six days after the eggs have been fertilized. [35] After five or six days it is much easier to determine which embryos will result in healthy live births. Knowing which embryos will succeed allows just one blastocyst to be implanted, cutting down dramatically on the health risk and expense of multiple births.
Before gastrulation, the cells of the trophoblast become differentiated into two layers: The outer layer forms a syncytium (i.e., a layer of protoplasm studded with nuclei, but showing no evidence of subdivision into cells), termed the syncytiotrophoblast, while the inner layer, the cytotrophoblast, consists of well
One young girl with a drug addiction died after collapsing on Day Three. The girl’s parents had taken out a $25,000 loan to pay for the program. Dr. McLellan, of the Treatment Research Institute, recalled a prominent facility he encountered in 2014 that made addicts wear diapers if they violated its rules.
The morula enters the uterus after three or four days, and as it does a cavity called the blastocoel is formed in the morula to produce the blastocyst. The blastocyst contains the inner cell mass that will go on to develop into the embryo proper, and an outer cell layer of trophoblasts that will develop into the extraembryonic membranes ( fetal ...