Spinal DiseasesSpinal Cord InjuriesSpinal CordSpinal NeoplasmsIntervertebral Disc DegenerationSpondylitis, AnkylosingSpinal Cord RegenerationLumbar VertebraeNerve RegenerationRecovery of FunctionAxonsNeural Stem CellsMyelin SheathNeurogliaRats, Sprague-DawleyCicatrixChondroitin ABC LyaseStem Cell TransplantationSpinal Cord DiseasesPyramidal TractsOligodendrogliaMeningesSpinal Cord CompressionDisease Models, AnimalSpinal Cord NeoplasmsCell TransplantationInjections, SpinalMotor ActivityAstrocytesSpinal NervesGlial Fibrillary Acidic ProteinAnesthesia, SpinalSchwann CellsNeuronsSpinal CanalUmbilical CordMicrogliaSpinal Nerve RootsImmunohistochemistrySpinal Cord IschemiaSpinal StenosisTime FactorsSpinal FusionRats, WistarCell DifferentiationCells, CulturedParaplegiaGreen Fluorescent ProteinsStem CellsSpinal InjuriesMotor Neurons