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Heart . Four chambers . Two atria Aortic arch Right pulmonary Left pulmonary . Two ventricles artery artery Parietal pericardium TO LUNG Pericardial cavity- Branches of right TO LUNG Fibrous pulmonary vein Visceral pericardium . Four valves (epicardium) pericardium FROM LUNG Branches of left Myocardium . Atrioventricular Superior vena cava pulmonary vein (from head and arms) FROM LUNG Endocardium Coronary vessels . Semilunar Aortic semilunar Pulmonary valve Fatty semilunar valve Mitral valve connective tissue . Three layers of heart wall LV Tricuspid valve- RV Interventricular . Pericardium Chordae tendineae septum Papillary Myocardium . Myocardium muscle Outside of heart Inferior vena cava unk and legs) . Endocardium Descending A B Inside of heart aorta Trabeculae carneae