The human body is equipped with an impressive information system made up of the central nervous system (CNS) and peripheral nervous system (PNS). The CNS includes the brain and spinal cord, and the PNS connects the CNS to limbs and organs. The network of nerves that make up the PNS include the sympathetic nervous system and the parasympathetic nervous system, but neuroblastomas only arise in the sympathetic system. The sympathetic nervous system responds to a person’s environment and emotions. For example, if a child is surprised or frightened, the sympathetic nervous system leaps into action by accelerating the heartbeat, increasing blood sugar, and cooling the body through perspiration.