SpasmSpasms, InfantileMuscle SpasticityHemifacial SpasmNeck MusclesCervical AtlasOccipital BoneNeuromuscular AgentsCoronary VasospasmSpinal Cord InjuriesMusclesBotulinum Toxins, Type AEsophageal Spasm, DiffuseMotor NeuronsElectromyographyMuscle, SmoothMuscle ProteinsErgonovineMuscle, SkeletalFacial MusclesAngina Pectoris, VariantMuscle, Smooth, VascularMuscle Fibers, SkeletalMuscle ContractionMuscle DevelopmentBlepharospasmMuscle FatigueMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchMyocytes, Smooth MuscleVigabatrinOculomotor MusclesMitochondria, MuscleMuscle Relaxation