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The Endowment for Human Development
The Endowment for Human Development
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The Body Plan Emerges

4 weeks

From The Biology of Prenatal Development.Buy Now

Label Key:

1. midbrain
2. forebrain
3. umbilical cord
4. hindbrain
5. neck
6. heart
7. left upper limb bud
All ages referenced to fertilization, not last menstrual period.
Four-Week Embryo
Four-Week Embryo
Digestive Tract, 4-Week Embryo
Digestive Tract, 4-Week Embryo
The Body Plan Emerges
The Body Plan Emerges
Right Upper Limb
Right Upper Limb
The Heart in Motion
The Heart in Motion
Central Nervous System
Central Nervous System
When does health begin? Find out now.
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