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myocardium. [mÄ«â²Åkaerâ²ÅkÃ¤rÂ·dÄ]. Ém: Etymology, gk, mys, muscle, kardia. heart a thick contractile middle layer of uniquely constructed and arranged muscle cells that forms the bulk of the heart. Wall the myocardium contains a minimum of other, tissue except blood, vessels and is covered interiorly by the. endocardium
According to Encyclopaedia Britannica, the wall of the heart is composed of three layers, namely the epicardium, myocardium and endocardium. Before reaching the myocardium, the coronary vessels that supply arterial blood to the heart first have to penetrate the epicardium or the outer layer. Basically, the myocardium is the middle layer of cardiac muscles.