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Foramen ovale
Formation of foramen ovale during fetal development of the interatrial septum, the red arrow represents blood flow between the 2 atria, unlabeled.
© Alila Medical Media
Image size: 39.1 Mpixels (112 MB uncompressed) - 6250x6250 pixels (20.8x20.8 in / 52.9x52.9 cm at 300 ppi)