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

Movie Theater

The Yolk Sac


5 weeks, 2 days

From The Biology of Prenatal Development.Buy Now

Script: Pęcherzyk żółtkowy zawiera wczesne komórki rozrodcze, zwane komórkami zarodkowymi. Do końca 5. tygodnia komórki zarodkowe przemieszczą się do narządów rozrodczych, przylegających do nerek.

All ages referenced to fertilization, not last menstrual period.
See Snapshots   |   Log in to create a playlist
Transparent Skin
Transparent Skin
Cerebral Hemispheres
Cerebral Hemispheres
The Yolk Sac
The Yolk Sac
The Liver and Heart
The Liver and Heart
Hand Plates and Cartilage
Hand Plates and Cartilage
Brainwaves
Brainwaves
Help give babies a healthy start and a healthy future. Donate now.
Tell your story. Create your own pregnancy calendar.