Spinal PunctureAnesthesia, SpinalPuncturesSpinal CordPost-Dural Puncture HeadacheAphidsSpinal Cord InjuriesLaryngoscopyTylenchidaFiber Optic TechnologyIntubation, IntratrachealNeedlesLaryngoscopesCoronary SinusPhloemTylenchoideaOptical FibersHemipteraDelivery RoomsInjections, SpinalSpinal NervesSpinal Cord DiseasesElectrodes, ImplantedSpinal Nerve RootsSpinal Cord NeoplasmsSpinal Canal