Relier Pairs Nervous SystemVersion en ligne fives par Jocelyn Ochoa 1 carry messages from cns. Instructs the body to do something. 2 chemicals in junction to allow impulses to be started in a second neuron 3 Primary cell of the nervous system that transmits impulses 4 A small gap or space between the axon of one neuron and the dendrite of another 5 brings senses changes messages to CNS 6 two main anatomical divisions of the nervous system 7 the in between sensory and motor neurons.