Supine PositionDura MaterSkullProne PositionSkull BasePatient PositioningPostureHeadSkull NeoplasmsSkull Base NeoplasmsSkull FracturesHead and Neck NeoplasmsTilt-Table TestHead-Down TiltHeart RateParietal BoneSupinationHypotension, OrthostaticGravitationNephrostomy, PercutaneousCranial SuturesHead MovementsBlood PressureCraniotomyRespiratory MechanicsTomography, X-Ray ComputedSkull Fracture, DepressedAutonomic Nervous SystemRespirationIndoraminFemur HeadValsalva ManeuverMovementPressureSyncopeOccipital BoneCraniosynostosesMagnetic Resonance ImagingBaroreflexDizzinessArachnoidMeningesSyncope, VasovagalHemodynamicsExpiratory Reserve VolumeCardiac OutputTidal VolumeTime FactorsCraniocerebral TraumaLegSudden Infant DeathPulmonary Gas ExchangeReference ValuesCerebrospinal Fluid RhinorrheaFluid ShiftsPalate, SoftTechnetium Tc 99m Aggregated AlbuminLung Volume MeasurementsEsophagusEsophageal pH MonitoringPulmonary CirculationNeckSperm HeadScalpRestRibsOxygenSleepHead Injuries, ClosedPharynxThoracic WallSleep ParalysisBlood Flow VelocityFunctional Residual CapacityRegional Blood FlowMolecular Sequence DataInhalationBedsDiaphragmLungPelvisAutonomic Nervous System DiseasesCarbon DioxideAirway ResistanceVentilators, Negative-PressureSpinePlethysmographyCentral Venous PressureLaminectomyAnesthesia, SpinalTemporal BoneCephalometryReproducibility of ResultsImaging, Three-DimensionalBiomechanical PhenomenaProspective StudiesAirway ObstructionPneumoperitoneum, ArtificialTongueLymphatic Irradiation