[Morphology of vessels and vascular plexus in the rat's brain following 93-day simulation of the effects of microgravity].

Results of the histological analysis of the brain of rats subjected to 93-d tail-suspension reveal morphological changes occurred to the arteries, veins and capillaries, ependymal cells of the ventricles and epithelium of the vascular plexus, and nervous and glial cells. On the one hand, these suggest venostatis and brain edema, impaired liquor production and liquor dynamics and increase in intracranial pressure and, on the other hand, adaptive processes in the arterial walls preventing the excess blood flow to the brain.