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Three-Week Embryo

3 weeks

Buy NowFrom The Biology of Prenatal Development.

Note:

The brain emerges about 2½ weeks following fertilization. By three weeks, the major sections of the brain are identifiable.

Label Key:

  • 1. midbrain
  • 2. forebrain
  • 3. hindbrain
  • 4. somites

All ages referenced to fertilization, not last menstrual period.
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Three-Week Embryo
Three-Week Embryo
Left Lateral View: 3-Week Embryo
Left Lateral View: 3-Week Embryo
Three-Week Embryo
Three-Week Embryo
3-Week Embryo
3-Week Embryo
The Folding of the Embryo
The Folding of the Embryo
The 4-Week Embryo
The 4-Week Embryo
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