The foramen ovale after birth becomes the

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The foramen ovale after birth becomes the

The foramen ovale closes after birth as part of the normal transition from fetal to neonatal circulation. In utero, it shunts blood from the right atrium to the left atrium to bypass the nonfunctioning fetal lungs. After birth, with lung expansion, pulmonary resistance falls and left atrial pressure rises, promoting functional closure of the opening. Over time the overlapping septa fuse and the former opening becomes a fibrous depression in the interatrial septum known as the fossa ovalis. For context, the other fetal remnants become Ligamentum arteriosum (from the ductus arteriosus), Ligamentum venosum (from the ductus venosus), and Ligamentum teres (from the umbilical vein).

The foramen ovale closes after birth as part of the normal transition from fetal to neonatal circulation. In utero, it shunts blood from the right atrium to the left atrium to bypass the nonfunctioning fetal lungs. After birth, with lung expansion, pulmonary resistance falls and left atrial pressure rises, promoting functional closure of the opening. Over time the overlapping septa fuse and the former opening becomes a fibrous depression in the interatrial septum known as the fossa ovalis. For context, the other fetal remnants become Ligamentum arteriosum (from the ductus arteriosus), Ligamentum venosum (from the ductus venosus), and Ligamentum teres (from the umbilical vein).

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