Zones Zones Olivocereb DSCT/CCT Ponto (motor) Ponto (pariet) Problems Contents Anatomy

Zones of the Cerebellum and Distribution of Fibers The various cerebellar afferents that we have learned distribute to different zones of the cerebellum. Four different zones need to be considered. These are the 1) medial zone, 2) intermediate zone, 3) lateral zone and 4) flocculonodular zone (or lobe). Let's consider the pathways that end in each zone or lobe. olivocerebellar fibers--distribute to the ENTIRE cerebellum cuneocerebellar fibers--distribute to the medial and intermediate zones dorsal spinocerebellar fibers--distribute to the medial and intermediate zones pontocerebellar fibers--distribute to the intermediate and lateral zones A. Those pontine grey neurons that project to the intermediate zone of the cerebellum receive their corticopontine input from the primary motor cortex (area 4). B. Those pontine grey neurons that project to the lateral zone of the cerebellum receive their corticopontine input from posterior parietal cortex (area 6). In comparison with the primary motor cortex, posterior parietal cortex is more involved in planning the motor act than in execution of the program. vestibulocerebellar fibers--(arise from the vestibular ganglion and nuclei) distribute primarily to the flocculonodular lobe