The motor system is like a network of roads and highways that helps us do things. It helps us move our body and complete activities that require movement. Our bodies have a system of nerves that runs from the brain to different parts of the body. These nerves are like the roads of the motor system, because they carry messages from the brain to the muscles. The brain tells the muscles what to do, such as move our arms and legs. When the muscles receive the message from the brain, they move our body and help us do activities. The motor system makes it possible for us to move and do things.