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Journal of Experimental Biology 154,407-420 (1990)
Published by Company of Biologists 1990

Effects of Sectioning Cranial Nerves IX and X on Cardiovascular and Ventilatory Reflex Responses to Hypoxia and Nacn in Channel Catfish

MARK L. BURLESON 1 and NEAL J. SMATRESK 1

1 Section of Comparative Physiology, Department of Biology, University of Texas at Arlington Arlington, TX 76019, USA

The afferent pathways mediating cardiovascular and ventilatory hypoxic reflexes were identified in anaesthetized, spontaneously breathing (ASB) channel catfish, Ictalurus pimctatus (Rafinesque), by bilateral section of cranial nerve IX and branchial branches of cranial nerve X to the four gill arches (Xb1-Xb4). Cardiovascular and ventilatory responses to hypoxia and NaCN were attenuated by partial denervation of the gills. There were no significant cardiovascular or ventilatory reflex responses to either hypoxia or NaCN after total branchial denervation. This suggests that hypoxic reflexes in channel catfish are mediated by O2-sensitive chemoreceptors located peripherally in the gills and innervated bycranial nerves IX and X.

Key words: Ictalurus punctatus, gill, glossopharyngeal nerve, vagus nerve, O2-sensitive chemoreceptors, hypoxia, NaCN

Accepted on July 4, 1990






© The Company of Biologists Ltd 1990