User:Vicktory7/sandbox
From Wikipedia, the free encyclopedia
The blastocyst is a structure formed in the early development of mammals. In humans, its formation begins 5 days after fertilization during the germinal stage of development. It possesses an inner cell mass (ICM) which subsequently forms the embryo. The outer layer of cells of the blastocyst are called the trophoblast. This layer surrounds the inner cell mass and a fluid-filled cavity known as the blastocoel. The trophoblast gives rise to the placenta.
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Blastocyst | |
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![]() Blastocyst just before implantation | |
A human blastocyst, 5 days after fertilization | |
Details | |
Carnegie stage | 3 |
Days | 5-9 |
Precursor | Morula |
Gives rise to | Gastrula and inner cell mass |
Identifiers | |
Latin | Blastocystis |
Anatomical terminology |
The human blastocyst comprises 200-300 cells following rapid cleavage throughout this stage. This group of cells embeds itself into the endometrium of the uterine wall where it will undergo later developmental processes, including gastrulation.
The use of blastocysts in in-vitro fertilization (IVF) involves culturing a fertilized egg for five days before implanting it into the uterus. It can be more a viable method of fertility treatment than traditional IVF.