The atrium and ventricle of a Xenopus heart. A. Atria are surrounded by the epicardium that consists of a layer of endothelium and some loose connective tissue containing blood vessels and nerves. The cardiac muscle is organized into thin strands. B. The [cardiac muscles] of the ventricle is quite large, [organized in thick bundles] and is also surrounded by an epicardium. . Image from AF Wiechmann and CR Wirsig (2003) "Color Atlas of Xenopus laevis Histology", (page 23, Chapter 2, Cardiovascular system: Figure 5). Copyright 2003. Kluwer Academic Publishers. Reproduced with kind permission from Springer Science & Business Media B.V.
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