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A long axis section through the heart profiles the cardiac septum to show the thin valve of the oval foramen (open arrow) on the left atrial side and the muscular rim on the right atrial side. The cut reveals the infolding of the right atrial wall at the superior rim that is filled with epicardial fat (asterisk) to form the interatrial groove. At the ventricular septum, the leaflets of the tricuspid and mitral valves are hinged at different levels (small arrows) producing offset between the right and left atrioventricular junctions. Thus, the vestibule of the right atrium overlies the ventricular septum. Abbreviations as before. Source: Chapter 37. Anatomy of Electrophysiology, Hurst's The Heart, 13e Citation: Fuster V, Walsh RA, Harrington RA. Hurst's The Heart, 13e; 2011 Available at: http://mhmedical.com/ Accessed: May 14, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved
