Ix

Figure 8 Composite color-coded diagram illustrating the distribution within the basilar pons of the rhesus monkey of projections derived from associative cortices in the prefrontal, posterior parietal, temporal, and parastriate and parahippocampal regions and from motor, premotor, and supplementary motor areas. The medial (A), lateral (B), and ventral (C) surfaces of the cerebral hemisphere are shown in the upper left. The plane of section through the basilar pons is shown in the lower left, and the rostrocaudal levels of pons I-IX are shown in the right. Cerebral areas that have been demonstrated to project to the pons using either anterograde or retrograde tracers are depicted in white, those areas studied with both anterograde and retrograde studies and found to have no pontine projections are shown on the hemispheres in light shading, and those with no pontine projections according to retrograde studies are shaded in gray. The dashed lines in the hemisphere diagrams represent the sulcal cortices. In the pons diagrams the dashed lines represent the pontine nuclei, and the solid lines depict the traversing corticofugal fibers. The associative corticopontine projections are substantial. There is a complex mosaic of terminations in the pons, and each cerebral cortical region has preferential sites of pontine terminations. There is considerable interdigitation of the terminations from some of the different cortical sites but almost no overlap (reproduced with permission from Schmahmann, 1997).

In Fig. 8, the pattern of the corticopontocerebellar loop is shown.

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