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Am J Physiol Regul Integr Comp Physiol 279: R109-R117, 2000;
0363-6119/00 $5.00
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Vol. 279, Issue 1, R109-R117, July 2000

Anatomic patterning in the expression of vestibulosympathetic reflexes

I. A. Kerman1,2, B. J. Yates2,3, and R. M. McAllen1

1 Howard Florey Institute of Experimental Physiology and Medicine, University of Melbourne, Parkville, Victoria 3052, Australia; and Departments of 2 Neuroscience and 3 Otolaryngology, University of Pittsburgh, Pittsburgh, Pennsylvania 15213

To investigate the possibility that expression of vestibulosympathetic reflexes (VSR) is related to a nerve's anatomic location rather than its target organ, we compared VSR recorded from the same type of postganglionic fiber [muscle vasoconstrictor (MVC)] located at three different rostrocaudal levels: hindlimb, forelimb, and face. Experiments were performed on chloralose-anesthetized cats, and vestibular afferents were stimulated electrically. Single MVC unit activity was extracted by spike shape analysis of few-fiber recordings, and unit discrimination was confirmed by autocorrelation. Poststimulus time histogram analysis revealed that about half of the neurons were initially inhibited by vestibular stimulation (type 1 response), whereas the other MVC fibers were initially strongly excited (type 2 response). MVC units with types 1 and 2 responses were present in the same nerve fascicle. Barosensitivity was equivalent in the two groups, but fibers showing type 1 responses fired significantly faster than those giving type 2 responses (0.29 ± 0.04 vs. 0.20 ± 0.02 Hz). Nerve fibers with type 1 responses were most common in the hindlimb (21 of 29 units) and least common in the face (2 of 11 units), the difference in relative proportion being significant (P < 0.05, chi 2 test). These results support the hypothesis that VSR are anatomically patterned.

muscle vasoconstrictor fibers; vasomotor pathways; sympathetic nerves


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