Spinal Nerve RootsSpinal NervesPeripheral Nervous System NeoplasmsNerve Compression SyndromesSpinal CordLumbosacral RegionRadiculopathyLumbar VertebraeChoroid PlexusBrachial PlexusNeuralgiaLumbosacral PlexusSpinal Cord InjuriesInjections, SpinalMagnetic Resonance ImagingSciatic NervePeripheral Nerve InjuriesSciaticaLigationPeripheral NervesCervical PlexusGanglia, SpinalNerve BlockHyperalgesiaPeripheral Nervous System DiseasesNerve FibersMyenteric PlexusCauda EquinaIntervertebral Disc DisplacementSpinal CanalRats, Sprague-DawleySubmucous PlexusSpinal Cord NeoplasmsCervical VertebraeSpinal StenosisPainPain MeasurementSacrumMyelographyEpidural SpacePain ThresholdChoroid Plexus NeoplasmsNerve RegenerationOptic NerveSpinal DiseasesSpinal Cord DiseasesSpinal Cord CompressionLaminectomyCeliac PlexusRhizotomyMononeuropathiesNeurons, AfferentMotor Neurons