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The Endowment for Human Development
The Endowment for Human Development
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Left Lateral View: 3-Week Embryo

#28, Slide 48 of 312

3 weeks

From The Biology of Prenatal Development.Buy Now

Label Key:

1. amnion
2. cephalic end of the embryo (meaning "toward the head")
3. yolk sac
4. embryo proper
5. amniotic cavity
6. caudal end (meaning "toward the tail")
7. umbilical cord
All ages referenced to fertilization, not last menstrual period.
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