What system does the brain connect to?

The brain connects to the central nervous system (CNS), which consists of the brain and spinal cord. The CNS is responsible for coordinating all of the body's functions, including movement, breathing, digestion, and reproduction. The brain is the control center of the CNS, and it receives and sends signals to the spinal cord and other parts of the body through a network of nerves. The spinal cord is a long, cylindrical bundle of nerves that runs from the brain down the back. It transmits signals from the brain to the rest of the body and from the body to the brain.