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Yolk Sac

5 weeks, 6 days

From The Biology of Prenatal Development.Buy Now

Note:

The yolk sac contains no yolk. However, early in pregnancy the yolk sac absorbs nutrients from the surrounding fluid (provided by the mother) and delivers them to the embryo. Thanks mom!

Label Key:

  • 1. yolk sac
  • 2. vitelline vessels

All ages referenced to fertilization, not last menstrual period.
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Yolk Sac
Yolk Sac
The Beating Heart
The Beating Heart
Hand Plate and Vital Organs
Hand Plate and Vital Organs
Left Hand Plate and Wrist
Left Hand Plate and Wrist
Brain and Umbilical Cord
Brain and Umbilical Cord
Close-up of Head, Brain
Close-up of Head, Brain
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