The age changes in the activity of some enzymes in neurons and in microvessels, revealed histochemically, as well as the volume of microvessels in spontaneously hypertensive (SH) rats differ from these changes in the controls. At the age of 3 months the activity of these enzymes and the number of active microvessels in SH rats increased. At the age of 6 months the activity of studied enzymes in SH rats decreased, while the number of active microvessels remained constant. The correlation between the morpho-functional characteristics of brain tissue in SH rats and its greater ischemic vulnerability is assumed.
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