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  • Blastocyst - product of cleavage, a ball of cells with a large fluid-filled cavity.
  • The fertilized egg becomes a blastocyst.
  • Blastocyst is a pre-embryonic development stage where cellular specialization begins.
  • After a series of cleavages the morula develops into a blastocyst by the time it reaches the uterus.
  • If blastocyst implants outside the uterine cavity, it results an ectopic pregnancy.
  • In the uterus, it attaches to the thickened uterine lining.