Abstract
Using a modification of the flying spot method for estimation of flow velocity in micro vessels, comparative observations were made on arterioles, venules and capillaries in the pulp of the rat incisor by vital microscopy. It was found that stimulation of the sympathetic nerves to the tooth, either at its apex or in the cervical sympathetic trunk, produced marked reduction of flow which was followed by a return to normal velocities at the cessation of stimulation. Direct stimulation of the sympathetic trunk produced very rapid reduction of flow velocity. Changes were also observed in response to administration of anesthetics and other procedures.
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