The central nervous system (CNS) is the processing center for the nervous system. It receives information from and sends information to the peripheral nervous system. The two main organs of the CNS are the brain and spinal cord.he brain processes and interprets sensory information sent from the spinal cord. Both the brain and spinal cord are protected by three layers of connective tissue called the meninges. Within the central nervous system is a system of hollow cavities called ventricles.
The edge of something is the end of it, the outer limit. You can sit on the edge of your desk, on the edge of a chair, on the edge of a cliff. As stated by someone else, sitting on the edge of your seat is used to indicate tension or anticipation. You are ready to jump up out of the seat as quickly as possible.
Something you can sit on, especially if it's a bench, stool, sofa, or chair, is a seat. Most bicycles have one seat, while many motorcycles have two seats. If your teacher invites you to Take a seat, he means Find a chair and sit in it.. There are seats in cars and airplanes, around tables, in restaurants, and in movie theaters. As a verb, seat means help someone find a place to sit, the way an usher seats audience members at a concert. Some people also use seat to mean bottom or buttocks, or the section of your pants that covers this body part.