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Yolk Sac and Vitelline Vessels
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5 weeks, 6 days
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The Biology of Prenatal Development
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Note:
According to some experts, the preferred name for "yolk sac" is "umbilical vesicle."
Label Key:
1. vitelline vessels
2. yolk sac
All ages referenced to fertilization, not last menstrual period.
Heart Chambers
The Vital Organs
Yolk Sac and Vitelline Vessels
Yolk Sac
The Beating Heart
Hand Plate and Vital Organs
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