Sub-regions of the corpus callosum (CC).

<p><b>A</b>, Mid-sagittal MR image of the CC showing the method (Witelson 1989) for defining 7 sub-regions. A and P indicate the anteriormost and posteriormost points of the CC. G, the anteriormost point on the inner convexity of the anterior callosum. A-P was used as the primary axis, lines perpendicular to which subdivide the CC into 7 sub-regions. <b>B</b>, Seven sub-regions were drawn as 7 seeds for fiber tracking. <b>C</b> and <b>D</b>, Fibers crossing through each seed on axial and sagittal anatomical images.