Spinal Nerve RootsSciaticaSpinal NervesPeripheral Nervous System NeoplasmsNerve Compression SyndromesRadiculopathyLumbosacral RegionSpinal CordLumbar VertebraeIntervertebral Disc DisplacementNeuralgiaMagnetic Resonance ImagingLumbosacral PlexusSpinal Cord InjuriesInjections, SpinalSciatic NervePeripheral Nerve InjuriesCauda EquinaLigationPeripheral NervesDiskectomyGanglia, SpinalSpinal CanalHyperalgesiaLow Back PainPain MeasurementPeripheral Nervous System DiseasesNerve FibersSpinal StenosisSacrumNerve BlockInjections, EpiduralPainSpinal DiseasesIntervertebral DiscSpinal Cord NeoplasmsRats, Sprague-DawleyCervical VertebraePiriformis Muscle SyndromePolyradiculopathyMyelographyPain ThresholdEpidural SpaceOptic NerveNerve RegenerationSpinal Cord DiseasesSpinal Cord CompressionLaminectomyCervical PlexusDecompression, SurgicalMononeuropathiesRhizotomyChymopapain