The cerebellum regulates balance and coordinates precise movement in the human brain.
Located at the back of the brain, beneath the occipital and temporal lobes, the cerebellum has two hemispheres and a distinctive folded surface. Although it accounts for roughly 10% of brain mass, it contains more neurons than the rest of the brain combined, according to widely cited estimates.
The cerebellum receives information about body position, movement, and visual input, then helps refine motor commands. It is essential for posture, walking, timing, motor learning, and skilled actions such as writing. It does not initiate every movement by itself; instead, it helps make movements smooth and accurately timed.
A common mix-up is confusing the cerebellum with the cerebrum. The cerebrum is the much larger upper portion involved in conscious thought, language, and perception, while the cerebellum specializes in coordination and balance. Damage to the cerebellum can cause ataxia, producing unsteady movement and poor coordination.