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Two-Cell Embryo

36 hours

Source: Centro Riproduzione Assistita, Catania, Italy.

Label Key:

  • 1. zona pellucida
  • 2. perivitelline space
  • 3. blastomere #1
  • 4. blastomere #2
  • 5. cell membrane of blastomere #1

All ages referenced to fertilization, not last menstrual period.
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Two-Cell Embryo
Two-Cell Embryo
Three-Cell Embryo
Three-Cell Embryo
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Four-Cell Human Embryo
Four-Cell Embryo
Four-Cell Embryo
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Six-Cell Embryo
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