When Marvin walks to work, his brain needs to be active, in order to communicate. The Neurons in his brain will send messages back and forth to other neurons in different parts of the brain, to create the actions he makes and the emotions he feels. These messages will travel the brain through Axons, which act as tunnels throughout Neurons. Once the message has reached its destination, the Dendrites will receive the message. Dendrites are on the end of Neurons, built specifically for receiving messages from other neurons.