Figure 1.

Interhemispheric white matter connections of the supplementary motor area (SMA) and premotor area (PMA) through the corpus callosum (CC). (a) Tractography illustrating white matter path from the frontal aslant tract (FAT) to contralateral SMA and PMAs. Fibers in blue are originating from the left hemisphere; yellow fibers are originating from the right. (b) Gross anatomical dissection of fiber bundles, tracts are similar to the ones illustrated in (a). Fiber tracts (blue and yellow arrows) originate from the FAT and course through the CC to end at the contralateral PMA. (c) Same image as (b) without markings. (d) Closer view of white matter bundles exiting the CC toward left and right PMAs