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The Endowment for Human Development
The Endowment for Human Development
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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.
The Zygote
The Zygote
Two-Cell Human Embryo
Two-Cell Human Embryo
Two-Cell Embryo
Two-Cell Embryo
Three-Cell Embryo
Three-Cell Embryo
Four-Cell Human Embryo
Four-Cell Human Embryo
Four-Cell Embryo
Four-Cell Embryo


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