[The normal distribution of oxygen tension on the surface of the brain radial arterioles and in their surrounding tissues and under normobaric hyperoxia].

The pO2 on the arterioles' wall was shown to depend on the diameter of the vessels under study in rats. In normoxia, the pO2 tissue gradients are small and do not depend on the vessel diameter, whereas in hyperoxia a sharp drop of the tissue pO2 occurs at some distance from the vessel and the dependence of the pO2 on the arteriole diameter can be registered practically in all the sites of measuring. Radical arterioles and adjacent tissues of the brain cortex were shown to be most affected by a high arterial pO2 in hyperoxemia.