Aortic depressor fibers in the rat: an electrophysiological study

¹ Department of Physiology, Faculty of Medicine of Ribeirão Prêto, University of São Paulo, Ribeirão Prêto, São Paulo, Brazil

In 51 rats the distribution of the aortic depressor fibers which travel in the cervical region with the vagus, sympathetic, laryngeal, or as a separate aortic nerve was investigated by recording the action potential or by stimulating these nerves. A separate aortic depressor nerve was found in only 20% of the rats on the left side and in 5% on the right side. In these animals no depressor fibers were identified in the sympathetic trunk but the laryngeal nerves usually still exhibited depressor fiber activity. In those rats with no separate aortic depressor nerve the aortic fibers were present almost equally in the sympathetic trunk and laryngeal nerves, and on both sides of the neck. Only exceptionally was depressor activity found in the vagus trunk, and stimulation elicited depressor instead of pressor effects in 2 out of 12 rats. Optimal stimuli for obtaining hypotensive effects from the aortic depressor fibers were 80–150 per frequency and 1–2-msec duration.

Key Words: baroreceptor afferents • aortic depressor, stimulation • aortic depressor, recording • sympathetic trunk, stimulation • sympathetic trunk, recording • laryngeal nerve, stimulation • laryngeal nerve, recording • vagus, central, stimulation

Submitted on February 11, 1963

This article has been cited by other articles:

				V. P. S. Fazan, H. C. Salgado, and A. A. Barreira A Descriptive and Quantitative Light and Electron Microscopy Study of the Aortic Depressor Nerve in Normotensive Rats Hypertension, September 1, 1997; 30(3): 693 - 698. [Abstract] [Full Text]