Muscular Atrophy, SpinalSpinal Muscular Atrophies of ChildhoodAtrophyMuscle, SkeletalMuscular AtrophySurvival of Motor Neuron 1 ProteinMusclesSMN Complex ProteinsSurvival of Motor Neuron 2 ProteinMuscle Fibers, SkeletalSpinal CordMuscle ProteinsMuscular Disorders, AtrophicMuscle, SmoothMuscle ContractionMuscle DevelopmentBulbo-Spinal Atrophy, X-LinkedMuscle, Smooth, VascularMotor NeuronsSpinal Cord InjuriesMuscle Fibers, Fast-TwitchNeuronal Apoptosis-Inhibitory ProteinMuscle DenervationOptic AtrophyMuscle Fibers, Slow-TwitchMitochondria, MuscleCyclic AMP Response Element-Binding ProteinAnterior Horn CellsMuscle FatigueMuscle WeaknessRNA-Binding ProteinsSatellite Cells, Skeletal MuscleNerve Tissue ProteinsMultiple System AtrophyMuscular DiseasesElectromyographyMyocytes, Smooth MuscleDisease Models, AnimalSpinal Cord DiseasesOculomotor MusclesMuscle, StriatedNeck MusclesQuadriceps MuscleMuscle CellsMotor Neuron DiseaseMuscle RelaxationMuscle SpindlesHindlimbRespiratory MusclesIsometric ContractionTime FactorsRibonucleoproteins, Small NuclearMice, TransgenicRabbitsMyofibrilsRNA, MessengerPapillary MusclesExonsNeuromuscular JunctionCells, CulturedAbdominal MusclesDEAD Box Protein 20Rats, Sprague-DawleyHindlimb SuspensionSpinal Nerve RootsOlivopontocerebellar AtrophiesMyosin Heavy ChainsMyoblastsMagnetic Resonance ImagingElectric StimulationMasseter MuscleChromosomes, Human, Pair 5MyostatinGlycogenCalciumPhenotypeNeuromuscular DiseasesMice, Inbred C57BLFacial MusclesGene Expression RegulationMasticatory MusclesMolecular Sequence DataInjections, SpinalGyrate AtrophyIntercostal MusclesSpinal NervesMyoblasts, SkeletalDiaphragmRats, WistarMuscular DystrophiesCoiled BodiesReceptors, AndrogenPectoralis MusclesRegenerationMyoD ProteinMice, KnockoutInsulinAgingMuscular Dystrophy, AnimalImmunohistochemistry