paleocerebellum

Medical Dictionary

paleocerebellum pa·le·o·cer·e·bel·lum (pā'lē-ō-sěr'ə-běl'əm)
n.
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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
paleocerebellum

noun
the anterior lobe of the cerebellum which was one of the earliest parts of the hindbrain to develop in mammals 
WordNet® 3.0, © 2006 by Princeton University.
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