SpasmMuscle SpasticityPharmacopoeiasSpasms, InfantileMusclesCervical AtlasOccipital BoneNeuromuscular AgentsSpinal Cord InjuriesHemifacial SpasmBotulinum Toxins, Type AMuscle ProteinsMuscle, SmoothMotor NeuronsMuscle, SkeletalElectromyographyMuscle, Smooth, VascularMuscle Fibers, SkeletalMuscle ContractionMuscle DevelopmentCoronary VasospasmEsophageal Spasm, DiffuseMuscle FatigueMuscle Fibers, Fast-TwitchFacial MusclesMuscle DenervationMuscle Fibers, Slow-TwitchMyocytes, Smooth MuscleMitochondria, MuscleOculomotor MusclesMuscle RelaxationMuscle, StriatedMuscle SpindlesSciatic NerveErgonovineRespiratory MusclesMuscle WeaknessPapillary MusclesAbdominal MusclesAngina Pectoris, VariantSasaMasticatory MusclesMuscle CellsMasseter MusclePeripheral NervesIntercostal MusclesMuscular AtrophyIsometric ContractionNerve FibersSatellite Cells, Skeletal MuscleElectric StimulationOptic NervePectoralis MusclesFacial NerveMuscular DiseasesTemporal MuscleNerve Regeneration