It contracts to pump blood out of the heart and then relaxes as the heart refills with returning blood. The inner layer of the heart. The Heart Circulatory Anatomy The chambers of the heart. . The wall of the heart is composed of three layers of unequal thickness. It is the outermost layer. It is the middle layer. It lines the cavities and valves of the heart. The layers of the heart are as follows. Describe the three layers of the heart wall. Answer 1 Coverings and layers of the heart wall Pericardium is the outer covering of the heart. Describe the layers of the pericardial sac. The outer layer of the wall of the heart. It is the thickest and made up of cardiac muscles which are striated but involuntary. Describe the three layers of the heart. The muscles of thethigh are composed of skeletal muscle tissue. From superficial to deep these are the epicardium the myocardium ...
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