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Between the ends of adjacent cardiac muscle cells are specialised intercellular junctions called INTERCALATED DISCS (shown right). These are irregular transverse thickenings of the sarcolemma that contain structures called DESMOSOMES. Desmosomes are like spot-rivets, that hold adjacent cardiac muscle fibres together.
Cardiac muscle is one of the three major types of muscle, the others being skeletal and smooth muscle. It is an involuntary, striated muscle that is found in the walls of the heart. This muscle tissue is known as myocardium, and forms a thick middle layer between the outer layer of the heart wall and the inner layer. Myocardium is composed of individual heart muscle cells joined together by intercalated disks, encased by collagen fibres and other substances forming the extracellular matrix. Card