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The Folding of the Embryo

3 weeks, 3 days

Buy NowFrom The Biology of Prenatal Development.

Label Key:

  • 1. base of umbilical cord
  • 2. hindbrain
  • 3. midbrain
  • 4. forebrain
  • 5. site of the future opening of the mouth (called the stomodeum)
  • 6. heart
  • 7. yolk sac

All ages referenced to fertilization, not last menstrual period.
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The Folding of the Embryo
The Folding of the Embryo
The 4-Week Embryo
The 4-Week Embryo
The Folding Heart
The Folding Heart
Four-Week Embryo
Four-Week Embryo
Digestive Tract, 4-Week Embryo
Digestive Tract, 4-Week Embryo
The Body Plan Emerges
The Body Plan Emerges
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