This atlas illustrates pathological changes of peripheral nerves covering experimental and human, light and electron microscopic, immunohistochemical, morphometric and moleculargenetic aspects. Basic general pathologic reactions are shown as well as characteristic alterations in a large number of specific diseases affecting the peripheral nervous system (PNS) primarily or secondarily. The 1050 illustrations are of diagnostic significance for those studying peripheral nerves at the miscroscopic or ultrastructural level, and for neurologists, neurosurgeons, neurobiologists, and electrophysiologists trying to understand the underlying structural changes causing the clinical signs and symptoms of a variety of diseases and disorders.