Human blastocyst hatching

  • K. Hardy
  • Digital Images
  • Online

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Human blastocyst hatching. K. Hardy. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.

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A human embryo at the blastocyst stage, about six days after fertilization, viewed under a light microscope. The embryo is in the process of "hatching" out of the zona pellucida - the tough outer membrane - just before implanting in the wall of the uterus. The actual size of the embryo is about 0.3 mm. Biomedical Image Awards 1997.


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