The spinal cord is made up of bundles of nerves that control your body's sensation and movement. (medlaw1.com)
Also in the spinal cord is the central bundle of nerves in charge of sending signals to and from the brain and the rest of the body. (chicagopersonalinjurylawyerblog.com)
White matter consists of large bundles of nerve cells that connect different regions of the brain and enable communication between them. (sciencedaily.com)