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The 4-Week Embryo

3 weeks, 4 days

Buy NowFrom The Biology of Prenatal Development.

Label Key:

  • 1. brain
  • 2. body cavities
  • 3. somites
  • 4. tail

All ages referenced to fertilization, not last menstrual period.
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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
Right Upper Limb
Right Upper Limb
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