which layer of the heart wall consists of mesothelium and connective tissue
The outer epicardium is a relatively thin layer of tissue that consists of a covering mesothelium and a thin underlying layer of loose connective tissue that merges into the connective tissue sheaths of the myocardium. The loose connective tissue supports the blood vessels and nerves that supply the heart. The inner endocardium is a bit more complex that the epicardium. The endocardium consists of a endothelium thatlines each chamber.