抄録
1. Cardiovascular effects of stimulation of the superior laryngeal nerve were studied in the dog by observing cardiac output and blood pressure as well as, efferent discharges in the vagus nerve.
2. The blood pressure decrease on stimulation of the superior laryngeal nerve was ascribable mostly to a decrease in cardiac output due to vagal bradycardia. No decrease in peripheral resistance was observed.
3. Only a fraction of the cardiac vagal fibers, responding to sinus nerve stimulation, were reflexly excitable on stimulation of the superior laryngeal nerve.
4. It is concluded that laryngeal nerve stimulation excites the cardiac vagal center without reciprocal inhibition of the sympathetic cardiovascular center and that the group of the cardiac vagal fibers which is excitable on laryngeal nerve stimulation is not identical with that of the fibers excitable on sinus nerve stimulation, though there is some overlapping between them.
