Blastocyst

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blastocyst

[′blas·tə‚sist]
(embryology)
A modified blastula characteristic of placental mammals.

Blastocyst

 

blastodermic sac, a stage in the development of mammal embryos, including humans, that arises as a result of cleavage of the fertilized ovum. The blastocyst is a hollow sac. An aggregate of cells—a node, analogous to the blastula of other animals—is found on one side of it. The outer wall of the blastocyst forms the trophoblast.