CapillariesLymphatic SystemMicroscopy, ElectronCerebrovascular CirculationBrainElectrophoresis, CapillaryBlood-Brain BarrierOxygen RadioisotopesMiddle Cerebral ArteryRegional Blood FlowTomography, Emission-ComputedOxygenBlood Flow VelocityUltrasonography, Doppler, TranscranialBrain ChemistryCarbon DioxideBrain InjuriesCapillary ActionBrain NeoplasmsCapillary PermeabilityBrain MappingBlood PressureHemangioma, CapillaryCapillary ResistanceCapillary ElectrochromatographyBrain EdemaBrain StemCapillary Leak SyndromeBrain IschemiaMagnetic Resonance ImagingMicrocirculationBrain Abscess