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Four-Week Embryo

4 weeks

Buy NowFrom The Biology of Prenatal Development.

Label Key:

  • 1. hindbrain
  • 2. spinal cord
  • 3. foregut
  • 4. heart
  • 5. midgut
  • 6. midbrain
  • 7. forebrain
  • 8. site of future mouth (stomodeum)
  • 9. chest wall
  • 10. yolk sac
  • 11. hindgut

All ages referenced to fertilization, not last menstrual period.
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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
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