Pressure?Ⅷ、 Treatment?Ⅸ、 Brain herniationРⅠ、 Anatomy--- The cranial cavityРThe cranial cavity: closed container / poorly distensibleРThree intracranial contents? ( pressible )Рcerebral blood?(2-10%、75ml)РCSF?(8-10%、75ml)Рbrain tissue?(80%、1400ml)РⅠ、 Anatomy--- The cranial cavityРⅠ、 Anatomy --- Circulation of CSFРCirculation in ventricular systemРArachnoid granulationРSuperior ?sagittal sinusРAqueductРChoroid plexus?(vessels)РThe 4th ventricleРSubarachnoid spacesРⅠ、 Anatomy --- Circulation of CSFР500ml/d and keep homeostasisРDefinition of ICPРIntracranial Pressure ( ICP)? ICP is the pressure inside the cranial cavity,created by the total volume of the intracranial contents exerting on cranial wall.РNormal value of ICP:РAdults: 70~200mmH2O (0.7~2.0 kpa )РChildren: 50~100mmH2O (0.5~1.0 kpa )
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