Cerebellum is a specialized part of your brain, located at the back of your skull, just above where your spine connects to your head. Its name comes from Latin words meaning “little brain,” which makes sense because it looks like a miniature version of your brain's main section.

The cerebellum's job is to coordinate movement and balance. When you reach for a pencil, your cerebellum makes sure your hand moves smoothly to exactly the right spot instead of jerking around wildly. When you're learning to ride a bike, your cerebellum is working hard to help you stay balanced and pedal at the right rhythm. It's also involved when you're learning physical skills like throwing a basketball or playing piano: the more you practice, the more your cerebellum refines those movements until they become automatic.

Without a properly functioning cerebellum, even simple movements become difficult. People might stumble when walking, struggle to pick up objects, or have trouble with tasks requiring precise timing.

Interestingly, scientists have discovered that the cerebellum also helps with some kinds of thinking and learning, along with its work coordinating physical movement. It's one of the most densely packed regions of the brain, containing more than half of all your brain's neurons, despite taking up only about 10% of its space.