TYPES OF AFFERENT FIBERS IN THE PHRENIC NERVE

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Abstract
The central ends of the 2 phrenic nerves were excited by induction or condensor shocks. Arterial pressures, respiration, and in some instances changes in kidney vol. and right atrial pressure were inscribed by optically recording systems. An analysis of results indicates that afferent fibers of the phrenic nerve communicate with respiratory, cardio-accelerator, and vasomotor centers, activities of which result in a rise of arterial pressure. The slowing effects sometimes observed at the height of the pressure rise are abolished by vagotomy and are therefore due to secondary effects on the carotid sinus. By selective stimulation with shocks of different strengths and frequency, it was found that the current strength as well as the frequency determines whether pressor or depressor reactions due to vasomotor action are obtained.

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