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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.
An isolated cardiac muscle cell, beating Cardiac muscle (heart muscle) is striated muscle (striped muscle) in the walls of the heart. It makes up the tissue called the myocardium. It is involuntary: a person cannot control it consciously. Cardiac muscle is one of three main types of muscle, the others being skeletal and smooth muscle. The cells that make up cardiac muscle have one (74%) or two (24.5%) nuclei. The myocardium forms a thick middle layer between the outer epicardium layer and the inner endocardium layer.