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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.
Intercalated discs Location. As mentioned earlier, these discs connect the individual heart cells called cardiomyocytes to form the atrial syncitium. In fact, both intercalated discs and pacemaker cells are characteristic of cardiac muscle tissues.Similarly, these transverse bands and striations are characteristic of cardiac muscle.ntercalated discs Location. As mentioned earlier, these discs connect the individual heart cells called cardiomyocytes to form the atrial syncitium. In fact, both intercalated discs and pacemaker cells are characteristic of cardiac muscle tissues.