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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.
There is also the presence of developmental myoblasts, and these coalesce to form the important muscle fibres of the skeletal muscle. These muscle fibres contain actin and myosin. Cardiac muscles are found in the myocardium of the heart, and they can also be known as myocytes..Unlike the skeletal muscles, there are gap junctions in the cardiac muscles, and their contractions function independently from each other. 6.There are only one or two nuclei in the cardiac muscle cells, while the skeletal muscle cells are multi-nucleated.