Cisterna MagnaFourth VentricleDandy-Walker SyndromeSubarachnoid SpaceVasospasm, IntracranialInjectionsParaparesis, SpasticSubarachnoid HemorrhageBasilar ArteryPlatybasiaCerebral VentriclesInjections, IntraventricularArnold-Chiari MalformationInjections, SpinalCerebrospinal FluidSeptum of BrainEchoencephalographyIntracranial PressureSyringomyeliaCranial Fossa, PosteriorGolgi ApparatusUltrasonography, PrenatalFetal DiseasesDogsHydrocephalusFasciolidaeCatsRabbitsPregnancy Trimester, SecondDisease Models, AnimalCerebral ArteriesBrainMicroscopy, ElectronRats, Sprague-DawleyInjections, IntravenousTime FactorsInjections, Intramuscular