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The Endowment for Human Development
The Endowment for Human Development
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Upper and Lower Limb Buds

4 weeks, 6 days

From The Biology of Prenatal Development.Buy Now

Label Key:

1. right upper limb bud
2. placental vessels
3. amnion
4. lower trunk
5. lower spine
6. umbilical cord
7. right lower limb bud with marginal vein
All ages referenced to fertilization, not last menstrual period.
Upper and Lower Limb Buds
Upper and Lower Limb Buds
Head and Heart
Head and Heart
Upper and Lower Limb Buds
Upper and Lower Limb Buds
The Lower Embryo
The Lower Embryo
Yolk Sac and Vitelline Vessels
Yolk Sac and Vitelline Vessels
Vitelline Vessels and Yolk Sac
Vitelline Vessels and Yolk Sac


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