SpasmMuscle RelaxationPrune Belly SyndromeNeck MusclesMusclesMuscle SpasticityMuscle, SmoothSpasms, InfantileCervical AtlasOccipital BoneMuscle, SkeletalMuscle ContractionMuscle, Smooth, VascularMuscle ProteinsNeuromuscular AgentsMuscle Fibers, SkeletalSpinal Cord InjuriesElectromyographyHemifacial SpasmBotulinum Toxins, Type AMuscle DevelopmentRelaxation TherapyMotor NeuronsMuscle FatigueMuscle Fibers, Fast-TwitchCoronary VasospasmMuscle DenervationMasticatory MusclesAbdominal MusclesMuscle Fibers, Slow-TwitchOculomotor MusclesMyocytes, Smooth MuscleFacial MusclesMitochondria, MuscleNitric OxideVasodilationEsophageal Spasm, DiffuseTracheaAcetylcholineIsometric ContractionMuscle, StriatedPapillary MusclesMuscle SpindlesElectric StimulationRespiratory MusclesCyclic GMPMeatMuscle WeaknessRabbitsDeuteroporphyrinsCalciumVasodilator AgentsMuscle CellsQuadriceps MuscleHSP20 Heat-Shock ProteinsNeuromuscular BlockadeNitroprussideGuinea PigsMasseter MuscleNeuromuscular Nondepolarizing AgentsTendonsDose-Response Relationship, DrugTime FactorsPenisIntercostal MusclesRelaxationEndothelium, VascularErgonovineBiomechanical PhenomenaRats, Sprague-DawleyMuscle TonusMuscle Relaxants, CentralMuscular AtrophySatellite Cells, Skeletal MuscleNeuromuscular JunctionAorta, ThoracicRats, WistarAortaAngina Pectoris, VariantOpossumsPectoralis MusclesIsoproterenolNitroarginineCyclic GMP-Dependent Protein KinasesNitric Oxide DonorsNitroglycerinSwineMuscular DiseasesOxadiazolesBiological FactorsMyofibrilsAnal CanalAdrenergic beta-AgonistsGuanylate CyclasePsoas MusclesNitric Oxide SynthaseDogsTemporal MuscleVasoconstrictionVasoactive Intestinal Peptide