Which system includes the brain, spinal cord, and nerves?

The central nervous system (CNS) is a fundamental system that encompasses the brain and spinal cord, serving as the main control center for the body. It is responsible for processing sensory information and coordinating responses, making it vital for both voluntary and involuntary functions. The CNS interprets incoming signals from the body's sensory organs and sends out instructions to the peripheral nerves, facilitating movement and reflex actions.

Understanding the structure of the central nervous system helps highlight its importance in maintaining homeostasis, regulating bodily functions, and enabling higher cognitive processes such as thought, memory, and emotional responses. This central hub is distinct from other nervous system subdivisions, making it clear that the brain and spinal cord are integral components of the CNS, ultimately defining its role in overall nervous system function.