| Vestibulocerebellum | Balance and eye movements |
| Spinocerebellum | Limb coordination and posture |
| Cerebrocerebellum | Movement planning and learning |
| Purkinje cells | Sole output of cerebellar cortex |
| Granule cells | Input layer, parallel fibers |
| Molecular layer interneurons | Inhibition |
| Deep cerebellar nuclei | Output to brainstem/thalamus |
| Truncal ataxia | Gait and balance |
| Limb ataxia | Arm/leg coordination |
| Appendicular ataxia | Fine motor control |
| Oculomotor ataxia | Eye movement abnormalities |
| Autosomal dominant | SCA, episodic ataxia |
| Databases | OMIMOrphanetClinicalTrialsPubMed |