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Medical Definition of Archicerebellum
1. The small, phylogenetically oldest portion of the cerebellum, also called vestibulocerebellum because its afferents arise from the vestibular ganglion and nuclei; in mammals, it is represented by four subdivisions of the cerebellum: nodulus, uvula vermis, flocculus, and lingula of cerebellum. Synonym: archaeocerebellum. Origin: archi-+ L. Cerebellum (05 Mar 2000)