The anatomy and physiology of nerve tissue and the peripheral nerve are reviewed. The importance of the anatomical and physiological understanding of nerve tissue in the surgical repair of nerve injuries is discussed. This includes an outline of the light and electron microscopic histology of nerve and a short review of axoplasmic flow. In addition, the nerve coverings, endoneurium, perineurium, and epineurium, are described. The relationship of these coverings to the surgical therapy of nerve injuries is outlined. By maintaining, where possible, nerve fascicle continuity and by restoring, where practical, the normal physiology of distorted but not disrupted fascicles, with the use of careful internal neurolysis, optimal clinical return of function should be achieved.
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