What Is a Blastocyst Transfer?

Blastocyst: Mulberry embryo cells continue to divide in the uterine cavity, and the number of cells continues to increase. By the fifth day of development, there are more than 100 cells. At this time, the cells rearrange into a vesicle, called a blastocyst or blastocyst. The blastocyst consists of three parts, namely trophoblast blastocyst cavity inner cell group.

Blastocyst

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Blastocyst: Mulberry embryo cells continue to divide in the uterine cavity, and the number of cells continues to increase. By the fifth day of development, there are more than 100 cells. At this time, the cells rearrange into a vesicle, called a blastocyst or blastocyst. The blastocyst consists of three parts, namely trophoblast blastocyst cavity inner cell group.

Chinese name

Blastocyst

Field

biological

Nature

noun

Constitute

three parts

In the early stages of mammalian development, embryos that end their cleavage phase are called blastocysts. Mammal eggs are non-yellow eggs, which undergo a complete cleavage to form a clump of blastomeres. A cavity is formed inside the clump, which gradually expands, and finally becomes a vesicle surrounded by a layer of cells. A cell mass on one side protrudes toward the inner cavity, such a vesicle is a blastocyst.

The layer of cells that make up the bubble wall is called the trophoblast, and the cell mass is called the inner cell mass or embryonoblast (Embryonalknoten). The latter is equivalent to the blastoderm part of other amniotic membranes, and embryonic bodies are formed here later. The inner cavity is called a blastocyst cavity, which is equivalent to other amniotic yolk masses, and is filled with a liquid containing a large amount of protein. The blastocyst expands rapidly, and the nourishing germ layer becomes extremely thin. At the same time, the shape of the blastocysts remained close to the original spherical shape, and some became very slender. The internal cell population was soon divided into the upper layer of the blastoderm and the lower layer of the blastoderm (endoderm). The former and the trophoblast form the ectoderm, while the lower layer of the blastoderm expands along the inner surface of the trophoblast. Further, the upper layer of the blastoderm forms a primitive strip, which generates a mesoderm between the outer and endoderm, and the endoderm and the attached mesoderm (the inner plate of the extraembryonic mesoderm) jointly form a yolk sac (also known as the umbilical sac. Long endoderm is not accompanied by an enlarged trophoblast, so the yolk sac is small). The fertilized egg forms a blastocyst as it descends from the fallopian tube, continues to enter the uterus and is implanted in the endometrium.