The ___________ forms the muscular, contractile layer of the heart.

Name: The ___________ forms the muscular, contractile layer of the heart.
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Myocardium. The structures that form the heart wall are the epicardium, a serous layer that covers the external aspect of the heart; the myocardium, a layer of cardiac muscle that originates from and inserts into fibrous rings surrounding the valve orifices; and the endocardium, an inner lining of endothelium.

The ___________ Forms the Muscular, Contractile Layer of the Heart