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: Clinical Highlights

Upper and Lower Limb Buds

#72, Slide 8 of 58

4 weeks, 6 days

From The Biology of Prenatal Development.Buy Now

Label Key:

1. right upper limb bud
2. placental vessels
3. amnion
4. lower trunk
5. lower spine
6. umbilical cord
7. right lower limb bud with marginal vein
All ages referenced to fertilization, not last menstrual period.
When does health begin? Find out now.
Tell your story. Create your own pregnancy calendar.