Peripheral nerve, light micrograph. Longitudinal section of a non-myelinated nerve showing axons arranged in wave-like patterns with very thin endoneurium (blue) separating the axons. Many elongated nuclei are Schwann cells and fibroblasts. Externally the nerve is supported by perineurium. Paraffin section, Masson's trichrome stain. Magnification: x190 when width printed at 10cm.