Our nervous system is divided into two parts: the peripheral nervous system, which receives messages from the sense organs and carries messages to the muscles and glands, and the central nervous system, which interprets and stress messages from the sense organs, decides what behaviors to exhibit, and sends appropriate messages for responding to the muscles and glands. Most of the behaviors involved in the above scenes are accomplished through the working of the central nervous system, which is composed of the brain and the spinal cord.

Thanks to the part of your brain that controls muscle coordination, the cerebellum, you are able to sit. You remembered a pleasant even from the past because that memory was stored in the cerebral cortex of your brain. You are able to think about future events because of the cortex. You become alert when your friend called your name because of a network of neurons in your brain, called a reticular formation, that controls arousal. Your occipital lobe analyzes visual information. The hypothalamus controls motivation.