Diagram of blastocyst

  • Alan Handyside
  • Digital Images
  • Online

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A blastocyst is a hollow ball of cells containing the inner cell mass. This cluster of cells gives rise to the foetus itself and contributes to the extraembryonic membranes whilst the trophectoderm gives rise to the placenta. The blastocyst breaks out of the zona pellucida prior to implanting in the uterine wall.

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