 Axonotmesis involves the interruption of the axon and its covering of myelin but preservation of the connective tissue framework of the nerve (the encapsulating tissue, the epineurium and perineurium, are preserved).Because axonal continuity is lost, Wallerian degeneration occurs.Electromyography (EMG) performed 2 to 4 weeks later shows fibrillations and denervation potentials in musculature distal to the injury site.