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A thin, muscular wall (oval depression) in the heart is seen
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Inter-atrial septum
An oval depression called fossa ovalis is present in the inter auricular septum within the right auricle. Through this foramen, the blood from the right auricle is communicated towards the left auricle in the embryo. Over the course of several months, the foramen ovale closes, leaving a shallow depression known as the fossa ovalis in the adult heart.
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