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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.
Heart 3. Cardiac Valves. The Fibrous Skeleton of the Heart. In addition to cardiac muscle tissue, the heart wall also contains a dense connective tissue network forming the fibrous skeleton of the heart that reinforces the myocardium internally and anchors the cardiac muscle fibers.This network of collagen and elastin fibres is thicker in some areas than others.n addition to cardiac muscle tissue, the heart wall also contains a dense connective tissue network forming the fibrous skeleton of the heart that reinforces the myocardium internally and anchors the cardiac muscle fibers. This network of collagen and elastin fibres is thicker in some areas than others.