The body’s nervous system is very involved system and is one of the most complex seen in the entire human body. It is comprised of the Central Nervous System (CNS), and the Peripheral Nervous System (PNS). The CNS is made up of the brain and spinal cord and works like the main central processing unit of the body. The PNS is all the branching nerves that run throughout the body to send and receive messages from the body and the brain. Together, the CNS and PNS control everything from your breathing, digestion, and heartbeat to walking, talking, and memory.