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A vasodilator innervation to the central artery of the rabbit ear.

1 The possibility of a vasodilator innervation to the isolated and perfused central artery of the rabbit ear was examined.2 Stimulation of the periarterial nerves in the presence of noradrenaline or other agonist used to maintain a partial constriction of the ear artery, led to a decrease in intraluminal flow followed after the cessation of stimulation by an increase in flow beyond the pre-stimulation level.3 After blockade of adrenergic transmission with bretylium or guanethidine or of the alpha- and beta-adrenoceptors with phentolamine and propranolol, stimulation of the periarterial nerves …