Cisterna MagnaFourth VentricleDandy-Walker SyndromeSubarachnoid SpaceVasospasm, IntracranialParaparesis, SpasticSubarachnoid HemorrhageBasilar ArteryPlatybasiaCerebral VentriclesArnold-Chiari MalformationCerebrospinal FluidInjections, IntraventricularEchoencephalographyInjections, SpinalSeptum of BrainIntracranial PressureSyringomyeliaCranial Fossa, PosteriorGolgi ApparatusInjectionsUltrasonography, PrenatalFetal DiseasesHydrocephalusDogsFasciolidaePregnancy Trimester, SecondBrainCatsCerebral ArteriesMicroscopy, ElectronRabbitsDisease Models, AnimalMagnetic Resonance Imaging