Skip Navigation
The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
  • English
Español
Português
Educator Login / Register
Donate Now Get Free Videos

Image Gallery

The 4-Week Embryo

3 weeks, 4 days

The 4-Week Embryo [Click for next image]
From The Biology of Prenatal Development.Buy Now

Label Key:

1. brain
2. body cavities
3. somites
4. tail
All ages referenced to fertilization, not last menstrual period.
3-Week Embryo
3-Week Embryo
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
Previous Set Previous Picture
Next Set Next Picture
Help give babies a healthy start and a healthy future. Donate now.
Buy the Biology of Prenatal Development DVD