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Four-Cell Embryo

48 hours

Source: Centro Riproduzione Assistita, Catania, Italy.

Label Key:

  • 1. blastomere #1
  • 2. blastomere #2
  • 3. blastomere #3
  • 4. blastomere #4
  • 5. zona pellucida
  • 6. inside border of zona pellucida
  • 7. perivitelline space

All ages referenced to fertilization, not last menstrual period.
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Four-Cell Embryo
Four-Cell Embryo
Five-Cell Embryo
Five-Cell Embryo
Six-Cell Embryo
Six-Cell Embryo
Seven-Cell Embryo
Seven-Cell Embryo
Eight-Cell Embryo
Eight-Cell Embryo
Nine-Cell Embryo
Nine-Cell Embryo
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