Quadriplegia is when both of a person's arms and both legs stop working. It usually
happens because of an injury
or disease that affects the brain
or spinal cord. The spinal cord is a long bundle of nerves that goes from the lower
part of the brain down through the middle of the back. It carries messages from the
brain to the rest of the body. If the spinal cord is hurt, the messages stop getting
where they need to go.