FIGURE 1.

Schematic representation of cerebellar gross anatomy. Anterior-posteriorly, the cerebellum presents three lobes (anterior, posterior, and flocculo-nodular), each one subdivided in lobules. Medio-laterally, it is composed of a central part (the vermis), and two lateral ones (cerebellar hemispheres). Vermis and paravermial zones form the spinocerebellum, so-called since it communicates with the spinal cord; the most lateral zones of the hemispheres constitute the cerebrocerebellum, in connection with the cerebral cortex. Finally, in regard to phylogenesis, the cerebellum can be divided into three parts: the archicerebellum (the most ancient one, corresponding to the vestibulocerebellum), paleocerebellum and neocerebellum.