The nervous system is made up of the brain, the spinal cord, and nerves that connect the brain and spinal cord to the rest of the body. The brain sends messages through the rest of the nervous system to tell your body what to do.
The nervous system is made of bundles of cells called neurons. Neurons are found throughout your body. They send electrical signals that direct all of your body’s activities, including thinking, breathing, and moving. These signals travel along the length of one neuron and jump to another neuron over a gap called a synapse.