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The Folding Heart

#32, Slide 53 of 312

3 weeks, 5 days

From The Biology of Prenatal Development.

Note:

Heart chambers begin developing quickly! It makes sense because the rapidly growing embryo requires a rapidly expanding circulatory system to survive and thrive.

Note:

The conotruncus represents the outflow tract of the heart. As development proceeds, the inflow end of the heart will become situated closer to the head as seen in the fetus, newborn, and adult.

Label Key:

1. right ventricle

2. conotruncus

3. left ventricle

4. atrio-ventricular canal (will receive incoming blood from the atria)

All ages referenced to fertilization, not last menstrual period.

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