paleocerebellum

noun

pa·​leo·​cer·​e·​bel·​lum -ˈbel-əm 

variants or British palaeocerebellum

ˌpal-ē- 

plural paleocerebellums or paleocerebella -ˈbel-ə 

: a phylogenetically old part of the cerebellum concerned with maintenance of normal postural relationships and made up chiefly of the anterior lobe of the vermis and of the pyramid compare neocerebellum