The article deals with the pathogenesis of subarachnoidal haemorrhage related to closed craniocerebral trauma with the reversible deformation of the cranial bones in the phase of damage. It is suggested that the damage to the blood vascular wall and the development of primary subarachnoidal haemorrhage is to a considerable extent caused by the effect of the membrane pump arising after a reversible deformation of cranial bones and manifesting by sharp changes in hydraulic pressure and the movement of liquid media in the subarachnoidal space of the cranial cavity.
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