Anterior Horn CellsSpinal Muscular Atrophies of ChildhoodMuscular Atrophy, SpinalNeuronal Apoptosis-Inhibitory ProteinSpinal CordSMN Complex ProteinsSurvival of Motor Neuron 1 ProteinSpinal Cord DiseasesMotor NeuronsMuscular AtrophyNeuronsElectromyographyHornsPosterior Horn CellsNeurons, AfferentMenisci, TibialMotor Neuron DiseaseArthrogryposisNeuromuscular DiseasesParalysisAmyotrophic Lateral SclerosisNeural ConductionSpinal Nerve RootsCats