Anesthesiaisanimportantpartofmedicine:theabilitytopreventpainand/orunwantedmovementduringsurgeryiscriticaltomakingtherequiredincisionsandinjectionsortoemployotherpotentiallypainfulprocedureswithoutcausingthepatientunduedistress.Patientswithchronicpain,especiallythosewithneuralgia(amalfunctioningnervethatconstantlysignalspain),alsorelyon