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3-Week Embryo
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3 weeks
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From
The Biology of Prenatal Development
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Label Key:
1. amnion
2. amniotic cavity
3. umbilical cord
4. allantois
5. yolk sac
All ages referenced to fertilization, not last menstrual period.
Left Lateral View: 3-Week Embryo
Three-Week Embryo
3-Week Embryo
The Folding of the Embryo
The 4-Week Embryo
The Folding Heart
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