Anatomically the cerebellum is divided into 3 lobes: a tiny flocculonodular lobe, a small anterior lobe, and a large posterior lobe. Functionally, it is also divided into 3 zones: 1) vestibulocerebellum, which is roughly the flocculonodular lobe, 2) spinocerebellum which is the medial zone of the combined anterior and posterior lobes, and 3) cerebrocerebellum, which is the bulk of the cerebellar hemispheres and lies lateral to the spinocerebellum. Moreover, these 3 functional divisions of cerebellar cortex project to the fastigial, interposed, and dentate deep nuclei, respectively. Traditionally, but somewhat archaically, the cerebellum has also been divided in 3 phylogenetic parts: 1) archicerebellum (flocculonodular lobe/vestibulocerebellum), 2) paleocerebellum (anterior lobe/spinocerebellum), and 3) neocerebellum (posterior lobe/cerebrocerebellum).
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