[Structure of the walls of the main arteries exposed to experimental hypergravitation and hypokinesia].

The structure of the wall of the carotid humeral and femoral arteries and the aorta was studied by histological methods in 260 rabbits under effects of positive longitudinal unendurable stresses, stresses of the training character and hypokinesia. Under study also was the structure of components of the aorta adventitia microcirculatory bed with the impregnation of tissue sections after V.V. Kuprijanov. The reversibility of morphological changes in the wall was studied after effects of the above factors and their different combinations. The experiments have shown the morphological changes in the wall to be of similar type and to consist of hyperelastosis and atrophy of the media under chronic stimuli. In the microcirculatory bed there occurred dilatation of postcapillaries and venules, diapedesic hemorrhages suggesting phenomena of stagnation. All the morphological changes were reversible speaking of great adaptive potentialities of the vascular system.