The foramen ovale becomes the fossa ovalis as the foramen closes, while the edge of the septum secundum in the right atrium becomes the annulus ovalis, so the depression beneath it becomes the fossa ovalis. This enables respiration and circulation independent from the mother's placenta.
What is the Difference between the Foramen Ovale and Fossa Ovalis?
Odudu Abasi Mkpong
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