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FIG 5. Molding of the occipital bone in a 76-year-old man. Normal scalloping of the inner table of the skull by the gyri situated to each side of the IPS-IOS commonly leaves small vertically oriented bony ridges (arrowheads) aligned along the parasagittal line. I = inferior parietal lobule, large O = superior occipital gyrus, S = superior parietal lobule, a = superior frontal sulcus, g = intraparietal sulcus, small o = intraoccipital sulcus, w = parietooccipital sulcus
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