what is fossa ovalis?
Answers
The fossa ovalis is a depression in the right atrium of the heart, at the level of the interatrial septum, the wall between right and left atrium. The fossa ovalis is the remnant of a thin fibrous sheet that covered the foramen ovale during fetal development.
Inter–atrial septum of the human heart has an oval depression called fossa ovalis. It is vestige of embryonic foramen ovale.
Foramen ovale is an opening in the inter–atrial septum of the human embryo heart through which some of the blood flows directly from the right atrium to left atrium (as oxygenation of blood does not happen in embryonic lungs).
After birth, foramen ovale soon gets plugged and the scar remains in the human adult heart as foss ovalis.
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