Plural form of cerebellum, the part of the brain at the back of your head that helps you balance, coordinate movements, and learn motor skills.
From Latin cerebellum, the diminutive of cerebrum (brain), literally meaning 'little brain.' The -um ending is Latin neuter singular, with -ums as the English plural adopted from the scientific Latin form.
Your cerebellum is only about 10% of your brain's weight but contains about 70% of its neurons—it's doing most of the work while your conscious mind thinks it's in charge!
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