Your brain is an essential organ that regulates everything you do. It’s one of the two main parts of your central nervous system.
This fact sheet is a basic introduction to the human brain. It can help you understand how the healthy brain works, how to keep your brain healthy, and what happens when the brain doesn't work like it should.
The brain contains billions of nerve cells arranged in patterns that coordinate thought, emotion, behavior, movement and sensation. A complicated highway system of nerves connects the brain to the rest of your body, so communication can occur in seconds.