1. Brain: The brain is the primary organ of the central nervous system and is responsible for processing and integrating sensory information, controlling motor functions, regulating emotions, and executing various cognitive processes.
2. Spinal Cord: The spinal cord is a long, cylindrical bundle of nerves that extends from the base of the brain down through the vertebral column. It serves as a communication pathway between the brain and the peripheral nervous system, relaying sensory and motor signals.