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"Okay everybody here's your GPS. Try to follow directions and don't get lost. We've got a lot of messages to deliver. Now trucks, hit the road. Oh, I'm so sorry. Let me introduce myself; I'm the Motor Cortex, I go by Mr. MC. I'm the part of the brain that plans and controls voluntary movements. Voluntary means intentional. I write the messages that tell certain body parts to work." "I'm his wife, Mrs. Up. I deliver the messages by using a group of trucks called the upper motor neurons. We live inside Rachael's head. We're in charge of a company called Rocky Road Trucking. We have three kids named Rit, Lit, and RFin," replied Mrs. Up. "We're a family-owned business that delivers the mail. We don't call ourselves Rocky Road Trucking for nothing. Managing brain activity is a tough job, but somebody's got to do it. Some days it can be tough sorting through the mail," replied Mrs. Up.