The inter atrial septum is patent during fetal life and closes after birth when the baby begins to breathe. It is formed as shown in the model. Atrial septal defects (ASDs) occur when the inter atrial septum is not completely closed after birth which needs urgent attention. The 2 types of myocardium found in the ventricle are also shown - compact myocardium and trabeculated myocardium.
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