paleocerebellum

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The phylogenetically old part of the cerebellum that includes most of the vermis as well as the adjacent medial zone of the cerebellar hemispheres rostral to the primary fissure. Also called spinocerebellum.

Originally, the phylogenetically older parts of the cerebellum; the term is now applied specifically to those parts whose afferent inflow is predominantly supplied by spinocerebellar fibers.

The noun has one meaning:

Meaning #1: the anterior lobe of the cerebellum which was one of the earliest parts of the hindbrain to develop in mammals