Fig. (1) Diagrammatic representation of collection, integration, and action in response to sensory input. Panel A presents an individual neuron, where dendrites collect sensory input, which is integrated at the cell body and summarized as a “fire/no fire” action via the axon and associated synapse. Panel B presents a complete, complex nervous system. Central and peripheral systems recapitulate the function of individual neurons: sensory neurons collect information from the environment, transmit this information to inter-neurons where it is integrated, and a response is mediated by motor neuronal output.