Spinal CordSpinal Cord InjuriesCervical VertebraeSpinal Cord DiseasesSpinal Cord CompressionSpinal Cord NeoplasmsSpinal CanalQuadriplegiaInjections, SpinalSpinal Nerve RootsSpinal InjuriesSpinal Cord IschemiaMotor NeuronsSpinal NervesSpinal StenosisLaminectomySpinal NeoplasmsSpinal DiseasesMyelitisAnesthesia, SpinalPhrenic NerveAnterior Horn CellsMyelographyParaplegiaRecovery of FunctionSpinal FusionParalysisThoracic VertebraeForelimbRats, Sprague-DawleySpondylosisMagnetic Resonance ImagingSpinal Cord RegenerationPosterior Horn CellsSpinal Cord StimulationAxonsNerve RegenerationContusionsNeckGanglia, SpinalPyramidal TractsLocomotionMuscular Atrophy, SpinalLumbosacral RegionElectric Stimulation TherapyAfferent PathwaysElectromyographyRespiratory ParalysisEpidural SpaceDisease Models, AnimalDecompression, SurgicalLongitudinal LigamentsElectric StimulationNeuronsNeck InjuriesRed NucleusSyringomyeliaBrain StemAutonomic DysreflexiaSpineUmbilical CordDura MaterTrigeminal Nucleus, SpinalCordotomyTime FactorsEpidural AbscessPainReflexHematoma, Epidural, SpinalHyperalgesiaSpinal OsteophytosisTuberculosis, SpinalCatsNeurons, AfferentMotor ActivityMedulla OblongataNerve TissueKlippel-Feil SyndromeLumbar VertebraeNeuralgiaEfferent PathwaysInfarctionNeuronal Tract-TracersNeurologic ExaminationInterneuronsSpinal CurvaturesArnold-Chiari MalformationNeuronal PlasticityEcho-Planar ImagingNeural PathwaysImmunohistochemistryTrigeminal Caudal NucleusReticular FormationNociceptorsChondroitin ABC LyaseSpinal Muscular Atrophies of ChildhoodOligodendrogliaNerve Fibers, MyelinatedElectrodes, ImplantedDiaphragm