Epidural SpaceAnesthesia, EpiduralNeedlesInjections, EpiduralDura MaterSpinal CanalLigamentum FlavumAnalgesia, EpiduralLumbosacral RegionEpidural NeoplasmsHybridization, GeneticLipomatosisInfertility, MaleRadiculopathySpinal Nerve RootsCoccyxLumbar VertebraeAnalgesia, ObstetricalThoracic VertebraeMyelographySpinal DiseasesTissue AdhesionsFiber Optic TechnologyAnesthesia, ObstetricalFertilityMathematical ConceptsIntracranial HypotensionSterilizationLaminectomySpinal CordIntervertebral Disc DisplacementSpinal Cord CompressionFluoroscopyBlood Patch, EpiduralAnesthetics, LocalInjections, SpinalEpidural AbscessInfertilitySpinal NeoplasmsAnesthesia, CaudalAnatomy, Cross-SectionalCrosses, GeneticCatheterizationPollenFentanylBupivacaineCervical VertebraeReproductionTomography, X-Ray ComputedSpinal Cord DiseasesEndoscopySpinal StenosisLow Back PainLidocaineMagnetic Resonance ImagingSpermatogenesisSteroidsPregnancy Trimester, ThirdDrosophilaNerve Block