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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.
How does excitation-contraction coupling in a cardiac muscle cell differ from that in a skeletal and smooth muscle fiber. Cardiac--depolarization due to influx of calcium ions through voltage gated channels (L type calcium channels which are modified versions of the DHP receptors in skeletal muscle). Cardiac--instead of being open directly by voltage as in skeletal muscle, cardiac are opened by binding of trigger calcium in cytosol.