The nervous system consists of two major parts: the central nervous system and the peripheral nervous system. The central nervous system is made up of your brain and spinal cord. This is closely connected to the peripheral nervous system, which includes all of the nerves that extend to every part of your body. When stimuli affect a nerve, the signal is sent through that nerve to the spinal cord and up to the brain. The brain processes this information and then sends a signal back the other way.
