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  • Title: [The ventricular myocardium of fish: aspects of comparative morphology, physiology and pharmacology. I) Myocardial architecture and vascularization].
    Author: Greco G, Tota B.
    Journal: Boll Soc Ital Biol Sper; 1981 Oct 30; 57(20):2053-9. PubMed ID: 7317198.
    Abstract:
    Fish represent a unique natural model for studying the structural arrangement of the ventricular myocardium and its blood supply during phylogeny. The more primitive spongious myocardium, fed by lacunary venous blood, is stepwise transformed into the mixed type of ventricular muscle, in which a compact cortical layer is often fed by oxygenated capillary network. The mixed type of heart muscle--which represents the homologous of the compact myocardium of the homeotherm vertebrates--is found in the most active fishes. The occurrence of this type of myocardium is discussed both in relation to the relative growth of the heart during phylogeny and to the physiological performance of the ventricular wall.
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