Yolk Sac and Vitelline Vessels

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

1. yolk sac

2. yolk stalk

3. vitelline vessels

All ages referenced to fertilization, not last menstrual period.

Upper and Lower Limb Buds

The Lower Embryo

Yolk Sac and Vitelline Vessels

Vitelline Vessels and Yolk Sac

The Lower Limbs and Back

Central Nervous System

5 weeks, 2 days