DSI is a novel high angular resolution diffusion MR imaging technique with high b-values that is able to map complex white matter architecture in the brain. We evaluate the capacity of a simple tractography method to define the essential fiber crossing anatomy. We find a cortico-spinal tract that spreads along the motor strip, callosal fibers that widely distribute throughout the parietal cortex and the arcuate fasciculus. All three fiber types intermix in a complex manner in the centrum semi-ovale.