Image GalleryYolk Sac |
![Yolk Sac [Click for next image]](http://media.ehd.org/images/prenatal_numbered_491/yolk-sac.jpg "Click for next image")
| Buy NowFrom The Biology of Prenatal Development. |
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:
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| All ages referenced to fertilization, not last menstrual period. |
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Yolk Sac
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The Beating Heart
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Hand Plate and Vital Organs
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Left Hand Plate and Wrist
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Brain and Umbilical Cord
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Close-up of Head, Brain
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