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Epicardium describes the outer layer of heart tissue (from Greek; epi- outer, cardium heart)). When considered as a part of the pericardium, it is the inner layer, or visceral pericardium.
It's largest constituent is connective tissue and functions as a protective layer - hence being thick, and contains pericardial fluid.
| Cardiovascular system - Heart | |
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Pericardium - Epicardium - Myocardium - Endocardium - Purkinje fibers - Cardiac pacemaker - Sinoatrial node - Atrioventricular node - Heart valves |