A, Lateral view of the brain centered at the level of the intraparietal sulcus. After removing the U fibers, superior longitudinal fascicle (SLF) II and the vertical occipital fasciculus (VOF) are shown. All the labeling comes from previous knowledge. B, Panoramic side view of the brain identifying the SLF II (linking the medial frontal gyrus and part of the upper region of the inferior frontal gyrus with the angular gyrus [AG]) and SLF III (connecting the inferior frontal gyrus with supramarginal gyrus [SPMG]). Red circle shows access region in A. (Image courtesy of E de Oliveira)