Fig. 5.

Schematic depiction of the 5 classes of CN afferent inputs, indicated by numerals: 1, GABAergic axons of the PCs converging on CN neurons; 2, glutamatergic axons of the IO neurons; 3, glutamatergic non-IO-originating axons that also branch as mossy fibers in the cerebellar cortex; 4, glutamatergic non-IO-originating axons that do not contribute to the cerebellar cortical mossy fibers; and 5, modulatory afferents. Abbreviations: MF, mossy fibers; PC, Purkinje cells; GC, granule cell; PF, parallel fiber; CF, climbing fiber; mcp, middle cerebellar peduncle; icp, inferior cerebellar peduncle. The arrows indicate approximate image directions: D, dorsal; V, ventral; L, lateral; M, medial. The Med, Int, and Lat are colored as in Fig. 2. For details regarding the distribution of the afferent axons among the nuclei, refer to Table 2