SpasmDystonic DisordersDystonia Musculorum DeformansMuscle SpasticityNeck MusclesSpasms, InfantileCervical AtlasOccipital BoneNeuromuscular AgentsSpinal Cord InjuriesMusclesHemifacial SpasmBotulinum Toxins, Type AMotor NeuronsElectromyographyMuscle ProteinsMuscle, SmoothCoronary VasospasmMuscle, SkeletalMuscle, Smooth, VascularMuscle Fibers, SkeletalEsophageal Spasm, DiffuseMuscle ContractionMuscle DevelopmentFacial MusclesErgonovineMuscle FatigueMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchAngina Pectoris, VariantMyocytes, Smooth MuscleMitochondria, MuscleOculomotor MusclesMuscle RelaxationMuscle, StriatedMuscle SpindlesRespiratory MusclesMuscle WeaknessPapillary Muscles