Gavage propolis (200-mg/kg body weight/d/28 d)  Adult female Wistar rats undergoing crush injuries of the sciatic nerve  EG: propolisCG1: curcuminCG2: methylprednisoloneCG3: sham ratsCG4: untreated rats with sciatic nerve injury  Gastrocnemius muscle mass, motor function, nerve fiber myelination, and nerve conduction.