Adrenergic innervation of the gills, pulmonary arterial plexus, and dorsal aorta in the neotenic salamander, Ambystoma tigrinum

Journal of Morphology
G M Malvin, W G Dail

Abstract

The presence of adrenergic innervation was investigated in four different vascular segments of the neotenic tiger salamander, Ambystoma tigrinum, by histofluorescent staining for catecholamines. The segments were the respiratory section of the gill, the branchial shunt vessels, a vascular plexus in the pulmonary artery, and the dorsal aorta. No adrenergic fibers were detected in the respiratory section of the gill or the pulmonary arterial plexus. In contrast, the branchial shunt vessels contained both adrenergic varicosities and catecholamine-containing cell bodies. These cells resemble Type I cells of the mammalian carotid body and amphibian carotid labyrinth. Adrenergic innervation of the dorsal aorta was sparse and restricted to the adventitia. The results suggest that adrenergic nerves may directly regulate blood flow in the gill, and thus gas exchange, by controlling vascular resistance of the branchial shunts. The contractile state of the dorsal aorta may also be under adrenergic control. In addition, it is suggested that the adrenergic cells of the branchial shunts may serve a receptor function in being sensitive to arterial blood gases.

References

Oct 1, 1979·Acta Physiologica Scandinavica·T AbrahamssonK Pettersson
Jan 1, 1969·Comparative Biochemistry and Physiology·S Kirby, G Burnstock

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Citations

Sep 16, 2005·Cell and Tissue Research·Heather A SaltysColin A Nurse
Feb 21, 2006·Respiratory Physiology & Neurobiology·Michael G Jonz, Colin A Nurse
Oct 18, 2002·Microscopy Research and Technique·Tatsumi Kusakabe
Dec 21, 2019·Biological Reviews of the Cambridge Philosophical Society·Warren BurggrenTobias Wang

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