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Figure 4 (a) Posterior longitudinal section of the atrial septum from the same case shown in Figure 3. The limbus (*) and valve (arrow) of the foramen ovale are indicated. A portion of mitral valve (MV) is seen at the inferior margin. (b) Boxed area demonstrates the area where the limbus attaches to the valve of the foramen ovale. Note the thick endocardial layer of the limbus and underlying myocardium separated by wide connective tissue bands. Movat x1.25. (c) A higher magnification of the boxed portion of the limbus in panel b characterized by a thickened endocardial surface rich in collagen and elastic fibers. Connective tissue bands are seen separating myocyte bundles. Movat x4.
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