[Activation mechanisms of the contractile cells of cerebral arteries and veins]. / Issledovanie mekhanizmov aktivatsii sokratitel'nykh kletok mozgovykh arterii i ven.

In isolated strips of internal carotid artery and middle cerebral artery in humans, spontaneous electric and contractile activities were revealed. Low (35 degrees C) and high (40--41 degrees C) temperatures inhibited the development of spontaneous contractions. Under depolarization of the cells' membranes by potassium ions, no development of spontaneous electric or contractile waves occurred, while contractions of the tonic type were observed in arterial preparations. No spontaneous contractions were found in the cerebral veins.