Blastocyst

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Blastocyst

Blastocyst (pronounced: /ˈblæstəˌsɪst/) is a structure formed in the early development of mammals. It possesses an inner cell mass (ICM) which later forms the embryo. The outer layer of the blastocyst consists of cells collectively 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 chorion, which will eventually form the placenta.

Etymology

The term "blastocyst" arises from the Greek βλαστός (blastos), meaning "sprout", and κύστις (kystis), meaning "cavity" or "bladder".

Related Terms

  • Embryo: An early stage of development in multicellular organisms.
  • Trophoblast: The outer layer of cells in the blastocyst that provide nutrients to the embryo and develop into a large part of the placenta.
  • Blastocoel: The fluid-filled cavity of the blastocyst.
  • Chorion: The outermost membrane surrounding an embryo of a reptile, bird, or mammal. In mammals, it contributes to the formation of the placenta.
  • Placenta: An organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply.

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