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When Health Begins
The Virtual Human Embryo
Prenatal Development DVD
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4 - 6 Weeks
6 - 8 Weeks
8 - 10 Weeks
10 - 12 Weeks
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6 - 9 Months
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Four-Cell Human Embryo
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48 hours
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From
The Biology of Prenatal Development
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Label Key:
1. perivitelline space
2. zona pellucida
3. blastomeres
All ages referenced to fertilization, not last menstrual period.
Two-Cell Embryo
Three-Cell Embryo
Four-Cell Human Embryo
Four-Cell Embryo
Five-Cell Embryo
Six-Cell Embryo
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