The wall of the heart is composed of cardiac muscle tissue, referred to as
myocardium. This tissue is similar to the voluntary muscles of the body. In the cardiac tissue, however, the elongated muscle cells are highly interconnected to assure the maintenance of a coordinated and orderly heartbeat. The medical term myocarditis refers to inflammation of the heart muscle. A very smooth tissue, endocardium, lines the interior chambers of the heart. This lining helps to reduce any friction that may be caused by blood that is constantly moving through the four hollow chambers of the heart. Endocarditis is an inflammation of the heart lining. This condition can cause rough spots to develop in the endocardium, which may lead to thrombosis. Research Myocardium