The nervous system is the major control, regulatory, and communication system in the body. It is involved in the control of the way we move, breathe, see, think, feel, and more. It has 2 main divisions: the central nervous system (CNS) and the peripheral nervous system (PNS). The PNS can be further divided into the somatic nervous systems (SNS) and the autonomic nervous system (ANS). The ANS has 2 divisions: the sympathetic nervous system (SNS, also called the sympathetic system) and the parasympathetic nervous system (PSNS, also called the parasympathetic system)