The cerebrum is the largest part of your brain, the wrinkled, rounded section that sits on top and takes up most of the space inside your skull. If you've ever seen a picture of a brain, that folded, walnut-like surface is the cerebrum.

This is where your most complex thinking happens. When you solve a math problem, remember your best friend's birthday, decide what to have for lunch, or imagine what it would be like to fly, you're using your cerebrum. It's also where you process what you see, hear, and feel, and where you control your voluntary movements, like reaching for a glass of water or writing your name.

The cerebrum is divided into two halves called hemispheres, connected in the middle. The left hemisphere generally controls the right side of your body, while the right hemisphere controls the left side. Different regions handle different jobs: one area helps with language, another helps with vision, another helps manage movement.

Scientists estimate that the cerebrum contains tens of billions of neurons, the specialized cells that send electrical and chemical signals throughout your brain. All those wrinkles and folds exist to pack more surface area into the limited space of your skull, giving you more brain power for learning, creating, and thinking about the world around you.