What are the two main divisions of the nervous system?

The central nervous system (CNS) and the peripheral nervous system (PNS) are indeed the two main divisions of the nervous system. The central nervous system encompasses the brain and spinal cord, serving as the control center for the body by processing information and coordinating actions. The peripheral nervous system consists of all the other neural elements, including nerves and ganglia outside the brain and spinal cord. Its primary function is to connect the CNS to the limbs and organs, facilitating communication between the central system and the rest of the body.

Understanding this distinction is crucial for grasping how the body's response mechanisms work. For instance, the peripheral nervous system is further subdivided into the autonomic and somatic systems, but those are not the main divisions being asked about. The sympathetic and parasympathetic systems refer specifically to the autonomic system's management of involuntary functions, while the brain and spinal cord are components of the central system rather than distinct divisions. Recognizing the overarching structure of the nervous system provides a foundation for further learning in human physiology and fitness training.