Spinal Nerve RootsSpinal NervesPeripheral Nervous System NeoplasmsNerve Compression SyndromesSpinal CordLumbosacral RegionRadiculopathyLumbar VertebraeGanglia, SpinalNeuralgiaSpinal Cord InjuriesInjections, SpinalMagnetic Resonance ImagingGangliaSciatic NervePeripheral Nerve InjuriesSciaticaLigationPeripheral NervesLumbosacral PlexusRetinal Ganglion CellsHyperalgesiaNerve FibersPeripheral Nervous System DiseasesCauda EquinaIntervertebral Disc DisplacementBasal GangliaNerve BlockGanglia, SympatheticRats, Sprague-DawleyGanglia, AutonomicSpinal CanalSpinal Cord NeoplasmsTrigeminal GanglionPainOptic NerveSpinal StenosisCervical VertebraePain MeasurementSacrumNerve RegenerationNeurons, AfferentGanglia, ParasympatheticMyelographyGanglia, SensoryAxonsPain ThresholdEpidural SpaceCervical PlexusAxotomySpinal DiseasesSpinal Cord DiseasesLaminectomySpinal Cord CompressionRhizotomyMotor NeuronsPosterior Horn CellsNeuritisMononeuropathiesPhysical Stimulation