From a functional point of view, the cerebellum is divided into three pas: 1. Vestibulocerebellum (or flocculonodular lobe) Consist of the nodulus in the vermis and the flanking flocculus in the hemisphere on each side. This lobe is phylogenetically the oldest pa of the cerebellum and has vestibular connections concerned with equilibrium and eye movements. 2. Spinocerebellum Formed by the rest of the vermis and the adjacent medial poions of the hemispheres. This region receives proprioceptive input from the body as well as a copy of the "motor plan" from the motor coex. By comparing plan with performance, it smooths and coordinates movements that are ongoing. 3. Cerebrocerebellum Includes the lateral poions of the cerebellar hemispheres. They interact with the motor coex in planning and programming movements.