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Rupture of the perineural sheath and hemorrrhage into its substance and into the meshes of the epineurium (schematic)

Schematic representation of a rupture of the perineural sheath and hemorrrhage into its substance and into the meshes of the epineurium, resulting in the formation of a hematoma. Legend: (a) epineurium, (b) perineurium, (c) nerve bundles, (d) hemorrhage. (Source: Clark LP, Taylor AS, Prout TP. A study in brachial birth palsy. Am J Med Sci 1905;130:670-707.)