How to translate text using browser tools
1 August 2018 Myocardium Arrangement and Coronary Vessel Distribution in the Ventricle of Three Neotropical Freshwater Teleosts
Mario Vitor Buzete Gardinal, Claudemir Kuhn Faccioli, Renata Alari Chedid, Ricardo Hideo Mori, Irene Bastos Franceschini Vicentini, Carlos Alberto Vicentini
Author Affiliations +
Abstract

The ventricle of the fish heart is a chamber that exhibits great morphological and vascular variability among species. However, although the Neotropical region has the greatest taxonomic and functional diversity in freshwater fish, many considerations have been formed without previous knowledge of the ventricular morphology of these fishes. Thus, the purpose of the present study was to describe the anatomy, myoarchitecture, and distribution of coronary vessels in the ventricle of three species belonging to two representative groups from this geographical area, Leporinus elongatus, Hoplias malabaricus (Characiformes) and Pterodoras granulosus (Siluriformes), using gross anatomy and light microscopy. The species L. elongatus and H. malabaricus presented a pyramidal ventricle associated to a mixed myocardium, formed by compact and spongy layers. The mixed myocardium was also observed in P. granulosus, but associated with a sac-like ventricle. The compact layer of the species studied was formed by muscular bundles in longitudinal and circular disposition. The spongy layer constituted most of the ventricular myocardium and was formed by a complex network of trabecular sheets presenting muscle fibers also in longitudinal and circular disposition. Coronary vessels were present in the three species and were observed primarily on the surface of the bulbus arteriosus, later branching on the ventricular surface and penetrating the myocardium only at the compact layer level. These characteristics allow classification of the ventricles studied as type II. Although the type I ventricle is the most common type in teleosts, it is important to emphasize that this type has not been observed in any Neotropical freshwater teleosts studied to date.

Mario Vitor Buzete Gardinal, Claudemir Kuhn Faccioli, Renata Alari Chedid, Ricardo Hideo Mori, Irene Bastos Franceschini Vicentini, and Carlos Alberto Vicentini "Myocardium Arrangement and Coronary Vessel Distribution in the Ventricle of Three Neotropical Freshwater Teleosts," Zoological Science 35(4), 360-366, (1 August 2018). https://doi.org/10.2108/zs180022
Received: 6 February 2018; Accepted: 26 March 2018; Published: 1 August 2018
KEYWORDS
Anatomy
heart
Histology
myoarchitecture
vascularization
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top