Muscle RigiditySpinal CordNeuroleptic Malignant SyndromeSpinal Cord InjuriesMasseter MuscleSuccinylcholineMalignant HyperthermiaAlfentanilFentanylHalothaneMusclesSpinal Cord DiseasesSpinal Cord CompressionSpinal Cord NeoplasmsMuscle, SkeletalMuscle ProteinsMuscle, SmoothSpinal Cord IschemiaMuscle Fibers, SkeletalMuscle, Smooth, VascularInjections, SpinalMuscle ContractionMotor NeuronsParaplegiaMuscle Development