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Three-Week Embryo

3 weeks

From The Biology of Prenatal Development.Buy Now

Note:

A week ago, I couldn't even spell brains but now that I am older, I have one of my own!

Label Key:

  • 1. forebrain
  • 2. midbrain
  • 3. hindbrain
  • 4. area where spine is developing

All ages referenced to fertilization, not last menstrual period.
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Three-Week Embryo
Three-Week Embryo
( 3 weeks)
The Folding of the Embryo
The Folding of the Embryo
( 3 weeks, 3 days)
Heart Chambers and Liver
Heart Chambers and Liver
( 4 weeks, 4 days)
Heart in Slow Motion
Heart in Slow Motion
( 4 weeks, 4 days)
The Early Brain and Face
The Early Brain and Face
( 4 weeks, 6 days)
Amnion
Amnion
( 4 weeks, 6 days)
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