I decided to create a drawing, likening the CNS and PNS to an old school telephone operating system. I used the spinal cord as the switchboard of the telephone system. The operator is the brain. Then there are wires, like telephone lines down the street, that are the PNS. They take the message that the CNS specifically meant for the toes down to the toes. Or the message that was meant for the arms, to the arms.