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Figure 1.   Normal nerve structure. Photomicrograph (original magnification, approximately x20; Bielschowsky silver stain) of an axial section of normal sural nerve. Nerve is surrounded by epineurium (straight arrows). Bundles of nerve fibers (*) are surrounded by perineurium (curved arrows), creating a fascicular appearance. Adipose tissue (black arrowheads) and blood vessels (white arrowheads) are seen about the nerve.