Sample sagittal MR images with the measurements for (A) the midline brain SA and (B) the CC with its segmentation. (C) Regional and functional subdivisions of the CC from (Witelson, 1989). Subsections: (1) rostrum, (2) genu, (3) rostral body, (4) anterior midbody, (5) posterior midbody, (6) isthmus and (7) splenium.