uschka,totheperimedullaryandperispinalsubarachnoidspaces,irculationCSFpressureisinequilibriumwithcapillarypressure(determinedbythearteriolartone)AnincreaseinbloodPCO2(hypoventilation)decreasespHandarteriolarresistance,thisinturngivesrisetoincreasedCSFpressurebyincreasingcerebralbloodflowHyperventilationhastheoppositeeffectCSFpressureNormalintracranialpressure(ICP)inanadultisbetween2-8mmHg.ocauseischemicdamageCSFpressureIncreasedvenouspressurehasadirecteffectonCSFpressureDownstreamblockofvenousflowincreasesthevolumeofcerebralveins,duralsinuses,andthesubarachnoidspaceThefunctionoftheCSFTheCSFactsasa“waterjacket”forthebrainandspinalcordThe1300gadultbrainweighsapproximately45gwhensuspendedinCSFThefunctionoftheCSFTheCSFactslikea“sink”,positionhelpsmaintainastablemediumforexcitablecells(neurons)
全文预览
