Spinal Nerve RootsSpinal NervesPeripheral Nervous System NeoplasmsNerve Compression SyndromesSpinal CordLumbosacral RegionRadiculopathyLumbar VertebraeUrinary BladderUrinary Bladder NeoplasmsNeuralgiaSpinal Cord InjuriesInjections, SpinalMagnetic Resonance ImagingSciatic NerveSciaticaPeripheral Nerve InjuriesLigationPeripheral NervesLumbosacral PlexusGanglia, SpinalHyperalgesiaPeripheral Nervous System DiseasesNerve FibersCauda EquinaIntervertebral Disc DisplacementNerve BlockUrinary Bladder DiseasesSpinal CanalRats, Sprague-DawleySpinal Cord NeoplasmsSpinal StenosisCervical VertebraePainSacrumPain MeasurementMyelographyPain ThresholdEpidural SpaceOptic NerveSpinal Cord DiseasesNerve RegenerationSpinal DiseasesLaminectomySpinal Cord CompressionCervical PlexusNeurons, AfferentMononeuropathiesUrinary Bladder, NeurogenicRhizotomyUrinary Bladder, OveractivePosterior Horn Cells