Action de la 5-Hydroxytryptamine Chez Les Céphalopodes

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Abstract
5-Hydroxytryptamine was isolated from the posterior salivary glands of Octopus vulgaris and it was shown that this substance is identical with Rapport''s serotonin, obtained from bovine serum. This substance exerts a positive inotropic effect on the isolated pulsating median ventricle of O vulgaris and seems to be present in the salivary gland extracts of this species, but not in those of O macropus. It has not been possible, however, to demonstrate this substance as the chemical mediator of impulses in cephalopods, at least in the tested systems (visceral nerve to the median ventricle and secretory nerves to the posterior salivary glands.).