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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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Heart in Slow Motion

4 weeks, 4 days

Heart in Slow Motion [Click for next image]
From The Biology of Prenatal Development.Buy Now

Note:

This video sequence demonstrates the heart's contraction-relaxation cycle. The portion of the cardiac cycle marked by relaxation of the ventricles is called diastole. The portion of the cardiac cycle marked by contraction of the ventricles is called systole.

Label Key:

1. midbrain
2. hindbrain
3. forebrain
4. 1st pharyngeal arch (mandibular process)
5. right edge of mouth (stomodeum)
6. umbilical cord in the background
7. abdominal wall
8. liver
9. heart chambers (outlined in yellow)
All ages referenced to fertilization, not last menstrual period.
The Head and Mouth
The Head and Mouth
Heart Chambers and Liver
Heart Chambers and Liver
Heart in Slow Motion
Heart in Slow Motion
Surrounded by the Amnion
Surrounded by the Amnion
The Early Brain and Face
The Early Brain and Face
Amnion
Amnion
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