Left Lateral View: 3-Week Embryo

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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.

Tube Shaped Heart

Three-Week Embryo

Left Lateral View: 3-Week Embryo

Three-Week Embryo

3-Week Embryo

The Folding of the Embryo

3 weeks