Fig. 1.

According to Schmahmann and Pandya (1997), the cerebrocerebellar circuit is composed of a feedforward limb that includes the corticopontine and pontocerebellar mossy fiber projections, and a feedback loop that contains the cerebellothalamic and thalamocortical pathways. The corticopontine pathway originates in the Vb layer of cerebral cortex and carries associative, sensory, and motor information from cortical neurons to neurons in the ventral pons. This information is directed to the cerebellum, and then projected to the thalamus through midbrain neurons of the red nucleus. Afferent pathways originating in the thalamus and projecting to the cortex complete the feedback loop