The U-fibers in the parietal-temporal-occipital area of the macaque (A and B) and human (C and D) brains. Colored lines are drawn on each blade of the left side of the brain to help the visual identification: blue line, PoC; brown line, SP; red line, PT; orange line, Tmp; and light blue line, Occ. (A and C) The U-fibers connecting the PoC and the PT (orange fibers) and the U-fibers connecting the SP and the PT (blue fibers) are shown. (B and D) The U-fibers connecting the PT and the Tmp (light green fibers); the U-fibers connecting the Tmp and the Occ (pink fibers); and the U-fibers connecting the SP and the Occ (orange fibers) are shown. Note that the orange fiber is not seen in the macaque brain.