Abstract
The effect of the electrical stimulation of the autonomic nerve on bronchial arterial flow was investigated using the preparation in which the bronchial arteries were separated from the aorta and perfused independently.
The sympathetic nerve stimulation elicited a decrease in bronchial arterial flow with an increase in calculated bronchial vascular resistance, thus suggesting the vasoconstriction.
Similarly, the vagosympathetic trunk stimulation and the carotid sinus nerve stimulation elicited a response in bronchial arterial flow which suggested the vasodilatation of the bronchial arteries.
The vasodilatatory changes with the carotid sinus nerve stimulation were elicited even after the bilateral vagotomy. The existence of a reflex vasodilatatory pathway to the bronchial arteries other than the one included in the vagosympathetic trunks was suggested. Experiments were made with an aim to estimate the course of this pathway.
