Image Gallery
The Folding of the Embryo
![The Folding of the Embryo [Click for next image]](/images/prenatal_numbered_655/the-folding-of-the-embryo.jpg "Click for next image")
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Label Key:1. base of umbilical cord 2. hindbrain 3. midbrain 4. forebrain 5. site of the future opening of the mouth (called the stomodeum) 6. heart 7. yolk sac | ||
| All ages referenced to fertilization, not last menstrual period. |
Three-Week Embryo
3-Week Embryo
The Folding of the Embryo
The 4-Week Embryo
The Folding Heart
Four-Week Embryo
