Muscular Atrophy, SpinalSpinal Muscular Atrophies of ChildhoodSurvival of Motor Neuron 1 ProteinAtrophySMN Complex ProteinsMuscular AtrophyMusclesSurvival of Motor Neuron 2 ProteinSpinal CordMuscle, SkeletalMuscle ProteinsMuscle, SmoothMuscular Disorders, AtrophicMuscle Fibers, SkeletalMuscle, Smooth, VascularBulbo-Spinal Atrophy, X-LinkedSpinal Cord InjuriesMuscle DevelopmentMotor NeuronsMuscle ContractionNeuronal Apoptosis-Inhibitory ProteinCyclic AMP Response Element-Binding ProteinAnterior Horn CellsMuscle DenervationRNA-Binding ProteinsMuscle Fibers, Fast-TwitchMuscle FatigueMuscle WeaknessMuscle Fibers, Slow-TwitchNerve Tissue ProteinsElectromyographyMitochondria, MuscleMyocytes, Smooth MuscleSpinal Cord DiseasesNeck MusclesOculomotor MusclesMuscle, StriatedMuscle SpindlesOptic AtrophyMotor Neuron DiseaseMuscle RelaxationRespiratory MusclesDisease Models, AnimalRibonucleoproteins, Small NuclearPapillary MusclesDEAD Box Protein 20Quadriceps MuscleSpinal Nerve RootsAbdominal MusclesMuscle CellsExonsMuscular DiseasesChromosomes, Human, Pair 5Masseter MuscleInjections, SpinalNeuromuscular JunctionFacial MusclesMasticatory MusclesSpinal NervesIntercostal MusclesMice, TransgenicIsometric ContractionSatellite Cells, Skeletal MuscleCoiled BodiesTime FactorsMultiple System AtrophyCells, CulturedAnesthesia, SpinalReceptors, AndrogenHindlimbNeuromuscular DiseasesPhenotypesnRNP Core ProteinsPectoralis MusclesElectric StimulationSpinal Cord NeoplasmsRats, Sprague-DawleySpinal CanalRNA, MessengerSpinal DiseasesNeural ConductionSpinal Cord CompressionPedigreeSpinal NeoplasmsMagnetic Resonance ImagingAxonsMyofibrilsPsoas MusclesMutationRabbitsContractureMuscular DystrophiesBulbar Palsy, ProgressiveMolecular Sequence DataTemporal MuscleGene Expression RegulationSpinal StenosisMyosin Heavy ChainsDiaphragmImmunohistochemistry