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At 20 days after removal of the epi-perineurium, the area of endoneurial swelling spread further (bar = 500 μm) (A), and degenerated nerve fibers (arrow) were noted in toluidine blue-stained sections in the outer portion (bar = 50 μm) (B) and in the central portion (arrow) (bar = 50 μm) (C) of the endoneurium. However, regeneration of the perineurium by the laminar structure of endoneurial fibroblast-like cells (arrows) were observed by electron microscopic examination (bar = 2 μm) (D).
