SpasmMuscle RelaxationMuscle SpasticityNeck MusclesSpasms, InfantileMusclesCervical AtlasOccipital BoneNeuromuscular AgentsMuscle, SmoothSpinal Cord InjuriesHemifacial SpasmMuscle ProteinsBotulinum Toxins, Type AMuscle, Smooth, VascularMuscle, SkeletalMuscle ContractionElectromyographyInflammationMotor NeuronsMuscle Fibers, SkeletalMuscle DevelopmentCoronary VasospasmMuscle FatigueEsophageal Spasm, DiffuseRelaxation TherapyMuscle Fibers, Fast-TwitchMuscle DenervationFacial MusclesMuscle Fibers, Slow-TwitchMyocytes, Smooth MuscleMitochondria, MuscleOculomotor MusclesMuscle, StriatedMuscle SpindlesPapillary MusclesErgonovineRespiratory MusclesMuscle WeaknessIsometric ContractionNitric OxideAcetylcholineTracheaAbdominal MusclesElectric StimulationAngina Pectoris, VariantMuscle CellsQuadriceps MuscleVasodilationRabbitsMasticatory MusclesMasseter MuscleTime FactorsCalciumIntercostal MusclesMuscular AtrophyRats, Sprague-DawleyVasodilator AgentsCyclic GMPDose-Response Relationship, DrugSatellite Cells, Skeletal MuscleGuinea PigsCells, CulturedEndothelium, VascularPectoralis MusclesMice, Inbred C57BLInflammation MediatorsMuscle Relaxants, CentralRats, WistarMuscular DiseasesDeuteroporphyrinsNitroprussideNeuromuscular Junction