Skip Navigation
The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
Donate Now Get Free Videos

Slideshow: Umbilical Cord, Placenta & More

The Lower Embryo

#73, Slide 1 of 35

4 weeks, 6 days

From The Biology of Prenatal Development.Buy Now

Label Key:

1. chest wall
2. heart
3. placental vessels
4. umbilical cord
5. liver
6. amnion surrounding embryo
7. abdominal wall
All ages referenced to fertilization, not last menstrual period.
When does health begin? Find out now.
Buy the Biology of Prenatal Development DVD