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Figure 7. Three-dimensional presentation of projection (green), association (red), and callosal (blue) fibers. A, Anterior view; B, left lateral view; C, superior view; D, left anterosuperior view. To demonstrate relative locations of these three families of tracts, projection (Fig 3), association (Fig 4), and callosal (Fig 6) fibers are depicted simultaneously. E-G, Representative transverse sections. Pixels that share more than one family of tracts can be identified in terms of color: Magenta is formed by red (association) plus blue (callosal); yellow, by green (projection) plus red; and cyan, by green plus blue. Note dominant presence of projection fibers in cortical areas around the central sulcus (cs). acr = anterior region of corona radiata, ec = external capsule, ic = internal capsule, pcr = posterior region of corona radiata, scr = superior region of corona radiata.
