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Interconnections among the cerebral cortex, basal ganglia, cerebellum and pedunculopontine tegmental nucleus (PPTg). Loops that link the cerebral cortex with the basal ganglia (Cortico-basal ganglia circuit; blue) and with the cerebellum (Cortico-cerebellar circuit; red) are shown. PPTg is intimately connected with the basal ganglia nuclei and also projects to the cerebellar nuclei.
