Closure of the foramen primum results from fusion of which of the following structures?
Correct Answer: Septum primum and the fused atrioventricular cushions
Description: C. The foramen primum forms between the free edge of the septum primum and the atrioventricular (AV) cushions. It is closed when the septum primum fuses with the AV cushions.
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Anatomy
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