In an adult, the interatrial septum bears a shallow opening that marks the site of the original foramen ovale, which is (the)

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The interatrial septum in adults bears a shallow depression or fossa called the fossa ovalis which is the site of the original foramen ovale present during embryonic development. The ductus arteriosus connects the pulmonary trunk to the aorta during development and becomes the ligamentum arteriosum in adults. The ductus venosus shunts blood from the umbilical vein to the inferior vena cava and closes off after birth.

In an Adult, the Interatrial Septum Bears a Shallow Opening