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Unformatted text preview: . Within the pericardial sac on the surface of the heart is another serous membrane known as visceral pericardium . The visceral pericardium is synonymous with epicardium. Pericardial fluid is between the parietal and visceral pericardia. The major tissue of the heart is cardiac muscle and forms the myocardium . Forming the framework of the myocardium is a fibrous skeleton that enables the myocardium to twist during contraction, increasing the efficacy of ventricular emptying. The skeleton also insulates the atria from the ventricles during action potentials . The innermost smooth layer of the heart is endocardium . The smoothness of the endocardium enables blood to flow smoothly through the chambers of the heart. (See Figure 3). Figure 3...
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- Fall '10