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

Image Gallery

Yolk Sac and Vitelline Vessels

5 weeks, 2 days

From The Biology of Prenatal Development.Buy Now

Note:

The yolk sac helps feed the embryo until the placenta is operational. It does NOT contain yolk at any time.

Label Key:

1. yolk sac
2. yolk stalk
3. vitelline vessels
All ages referenced to fertilization, not last menstrual period.
Upper and Lower Limb Buds
Upper and Lower Limb Buds
The Lower Embryo
The Lower Embryo
Yolk Sac and Vitelline Vessels
Yolk Sac and Vitelline Vessels
Vitelline Vessels and Yolk Sac
Vitelline Vessels and Yolk Sac
The Lower Limbs and Back
The Lower Limbs and Back
Central Nervous System
Central Nervous System
Help give babies a healthy start and a healthy future. Donate now.
Tell your story. Create your own pregnancy calendar.


Add a Comment

Your Name: Log In 3rd-party login: Facebook     Google     Yahoo

Comment: