A map of the human nervous system. The central and peripheral nervous system of a plastinated cadaver are part of the "Body Worlds and The Story of The Heart" exhibit. (Cyrus McCrimmon, The Denver Post )
A microscopic photograph of a neuron. Filamentous actin and microtubules (structural proteins) in mouse fibroblasts (cells) Fluorescence. / Torsten Wittmann, The Scripps Research Institute. Courtesy of Nikon Small World.