<prompt> Neuropraxia is a condition characterized byDivision of nerve sheathDivision of axonsDivision of nerve fibresPhysiological block  <response>: Ans. d Physiological blockRef Apleys 8th 231Patterns of nerve injuryNeuropraxiaAxonotmesisNeurotmesis Reversible physiological nerve conduction block It is seen in crutch palsy tourniquet palsy, and Saturday night palsy. There is loss of conduction because of axonal interruption but the nerve is in continuity and the neural tubes are intact Seen in closed fractures and dislocations There is complete division of nerve with complete loss of conduction i.e. epineurium, perineurium, endoneurium, axon all have lost their continuity Seen in open wounds 