Spinal Nerve RootsGanglia, SpinalSpinal NervesPeripheral Nervous System NeoplasmsNerve Compression SyndromesSpinal CordLumbosacral RegionRadiculopathyLumbar VertebraeNeuralgiaSciatic NerveSpinal Cord InjuriesInjections, SpinalPeripheral Nerve InjuriesMagnetic Resonance ImagingPeripheral NervesSciaticaHyperalgesiaLigationLumbosacral PlexusPeripheral Nervous System DiseasesNerve FibersNeurons, AfferentTooth RootRats, Sprague-DawleyCauda EquinaIntervertebral Disc DisplacementNerve BlockPainRhizotomySpinal CanalPain MeasurementSpinal Cord NeoplasmsNerve RegenerationCervical VertebraePain ThresholdSpinal StenosisSacrumAxonsAxotomySensory Receptor CellsPosterior Horn CellsMyelographyMotor NeuronsEpidural SpaceLaminectomyNeuritisSpinal DiseasesOptic NervePhysical StimulationSpinal Cord DiseasesCervical PlexusSpinal Cord CompressionNociceptorsMononeuropathiesNerve Fibers, MyelinatedNeural ConductionLow Back PainBrachial PlexusTibial NervePlant Root CapTrigeminal NerveAnalgesics