The nervous system is anatomically divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is made up of the brain and spinal cord. The PNS consists of both cranial and spinal nerves that act as conduits for information travelling between the body and the CNS. The PNS can be functionally subdivided into sensory and motor components. The motor division of the PNS is subdivided into the somatic nervous system that primarily controls voluntary activities and the visceral efferent nervous system that primarily controls involuntary activities. The visceral motor system is also called the autonomic nervous system (ANS). It has two branches: the sympathetic nervous system and parasympathetic system ().