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in Embryonic Development in Man by (45.7k points)
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How and when the formation of blastocyst takes place?

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Blastulation: 

  • Formation of blastula/blastocyst from morula is known as blastulation. 
  • In human morula, the outer cuboidal cells become flattened when it reaches into the uterus. 
  • These flattened cells are called as Trophoblast, by which they adhere with uterine epithelium. 
  • Cleavage continued and a cluster of cells differentiates into two distinct groups, the epithelial-like trophoblast or nutritive cells surrounding the expanding cavity and inner cell mass of formative cells of the embryo. 
  • The cavity is called blastocoel and embryo is known as a blastocyst (a kind of blastula) in human.

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