[Architectonics of the arterial bed of the cerebral hemispheres in the normal rat and following a stay at an "altitude" of 5600 m].

Post mortem morphometric study of the arterial bed of the brain hemispheres in rats after 90-day stay at "the altitude" 5600 m revealed a noticeably larger diameter of arteries (D), a greater coefficient of their branching, lesser distances between branches (L), larger angles of branch deviation and a longer capillary bed. Calculations based on these data show that amount of arterial vessels and capillaries must increase in hypoxia, their length and linear blood flow velocity (V) must diminish, and the value of V/D2 and epsilon (LV/D2) characterizing the gradient of impetuous pressure and total losses of the impetuosity in the vascular bed must decrease.