Spinal Nerve RootsSpinal NervesNerve Compression SyndromesRadiculopathyLumbar VertebraePeripheral Nervous System NeoplasmsSpinal CordLumbosacral RegionSciaticaIntervertebral Disc DisplacementSpinal StenosisDiskectomySciatic NervePeripheral NervesNeuralgiaPeripheral Nerve InjuriesNerve FibersSpinal Cord InjuriesInjections, SpinalMagnetic Resonance ImagingNerve BlockLigationLumbosacral PlexusOptic NerveGanglia, SpinalHyperalgesiaPeripheral Nervous System DiseasesNerve RegenerationCauda EquinaRats, Sprague-DawleyTibial NerveSural NerveSpinal CanalFacial NerveSpinal Cord NeoplasmsNerve EndingsPainCervical VertebraeTrigeminal NerveMedian NerveNerve CrushPain MeasurementSacrumUlnar NerveMyelographyPain ThresholdFemoral NerveEpidural SpaceAxonsNerve Fibers, MyelinatedNeurons, AfferentSpinal DiseasesSpinal Cord DiseasesMotor Neurons