Angioarchtecnologic Changes of Brain Stem in Acute Brain Compression

10 kg., were used in this study. Under I.V. anesthesia, these specimens were taken from the following two groups of the dgogs; group 1) only under I.V. anessthesia and group 2) with unilateral artificially-made brain edema by inserting the rubber balloon extradurally via small burr hole. The subcellular fractions were separated to the phosphorous compounds utilizing Schneider's method and their specific activities were also calculated according to Alleu's method. 1) The decrease of ATPase activities was noted in the artificially compressed side of the hemisphere than that of the non-compressed side, and the control group respectively. 2) At 4 hour period following the compression, the ATPase activities of the cerebral cortex, marrow and the brain stem were noticed to be the highest among the compressed dogs, where as that of the cerebellum was noticed later 6 hour