[Efferent link of cardiac reflexes with carotid labyrinth receptors in the frog].

In frongs, changes of sympathetic and parasympathetic discharges were studied in the structures of the efferent link of the cardial reflexes from carotid chemoreceptors. Both the acid and the alkaline fluids perfused through the carotid labyrinth considerably decrease the sympathetic and increase the parasympathetic discharges in the cardial branches of the vago-sympathetic trunk. Cerebral portions above the medulla oblongata exert no essential effect on the specific features of reflex changes of the efferent activity in the vago-sympathetic trunk. After separation of the medulla oblongata from the spinal cord, the sympathetic discharges do not change in response to stimulation of carotid receptors while the alteration of parasympathetic activity holds on.