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The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
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3-Week Embryo

3 weeks

3-Week Embryo [Click for next image]
From The Biology of Prenatal Development.Buy Now

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
Left Lateral View: 3-Week Embryo
Three-Week Embryo
Three-Week Embryo
3-Week Embryo
3-Week Embryo
The Folding of the Embryo
The Folding of the Embryo
The 4-Week Embryo
The 4-Week Embryo
The Folding Heart
The Folding Heart
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