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.
An aircraft 'rolling', or 'banking', with its ailerons. An Aileron and roll trim tab of a light aircraft. An aileron (French for 'little wing') is a hinged flight control surface usually forming part of the trailing edge of each wing of a fixed-wing aircraft.ilerons are the trailing-edge control surfaces nearest the wing tips (although on some airliners a supplementary aileron can also be found on the inner portion of each wing). On this parked Piper Cherokee, the left aileron is positioned downward, and the right, upward.