Abstract
Photohemotachometry (after Cybulski-Klisiecki) is a simple and convenient method for quantitative recording on a photokymograph of the blood circulation volume velocity in large blood vessels. While measuring the circulation in the internal carotid artery of dogs it was revealed, that the neuromuscular apparatus of this vessel is almost as sensitive to the physiologically active agents as that of the external carotid artery branches. Following local intravascular injection of 0.5 microgram of adrenalin the internal carotid arteries become constricted. One microgram of acetylcholine and the same dose of histamine cause dilation of these arteries.
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