Lumbosacral RegionSacrumMeningoceleAnterior Horn CellsSpinal CordMuscular Atrophy, SpinalSpinal Cord InjuriesLumbosacral PlexusSpinal Cord DiseasesSpinal Nerve RootsSpinal Cord CompressionSpinal Cord NeoplasmsLumbar VertebraeSpinal Cord IschemiaInjections, SpinalMotor NeuronsCauda EquinaSpinal NervesSpinal CanalSpinal DiseasesSpinal NeoplasmsParaplegiaRadiculopathySpinal Fusion