Image Gallery
Four-Week Embryo
![Four-Week Embryo [Click for next image]](/images/prenatal_numbered_655/four-week-embryo.jpg "Click for next image")
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Label Key:1. hindbrain 2. spinal cord 3. foregut 4. heart 5. midgut 6. midbrain 7. forebrain 8. site of future mouth (stomodeum) 9. chest wall 10. yolk sac 11. hindgut | ||
| All ages referenced to fertilization, not last menstrual period. |
The 4-Week Embryo
The Folding Heart
Four-Week Embryo
Digestive Tract, 4-Week Embryo
The Body Plan Emerges
Right Upper Limb
