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The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
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Tube Shaped Heart

3 weeks

Tube Shaped Heart [Click for next image]
From The Biology of Prenatal Development.Buy Now

Label Key:

1. outflow tract
2. right ventricle
3. left ventricle
4. inflow tract
All ages referenced to fertilization, not last menstrual period.
Embryo Cross Section 8-9 Days
Embryo Cross Section 8-9 Days
Embryo at About 11 Days
Embryo at About 11 Days
Tube Shaped Heart
Tube Shaped Heart
Three-Week Embryo
Three-Week Embryo
Left Lateral View: 3-Week Embryo
Left Lateral View: 3-Week Embryo
Three-Week Embryo
Three-Week Embryo
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Free resources and training for educators
Tell your story. Create your own pregnancy calendar.