Light micrograph of a peripheral nerve in cross-section showing both myelinated and nonmyelinated axons. Myelin sheaths are seen as irregular dense circles which enclose an axon. Nonmyelinated nerves occur as very small clusters of pale-stained ring-like structures representing axons. Scattered nuclei (blue/purple) are Schwann cells and fibroblasts. Two capillaries are located centrally. Epoxy resin section, Toluidine blue stain. Magnification: x 300 when width printed at 10cm.