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Fig. 5 | Applied Microscopy

Fig. 5

From: Fine structure of the cardiac muscle cells in the orb-web spider Nephila clavata

Fig. 5

Electron micrographs of the intercalated disc and neural innervation of cardiac muscle cells in N. clavata. a: Intercalated disc (cd) is formed by deep penetration of the sarcolemma. Coupling of transverse tubules (T) and terminal cisternae of sarcoplasmic reticulum (sr) are observed. b: Intercalated discs are composed of dense layer of sarcolemma, two plasma membranes (arrowheads), and a regular interspace (asterisk). c: Gap junctions (ga), fascia adherens (fa), and macula adherens (arrows) junctions are seen. d, e. Cardiac muscle cell (mc) is innervated by a branch of external nerves (ne). A bundle of axons (ax) extend across the heart and penetrate the myocardium. Scale bars indicate 0.25 μm (a-c), 5 μm (d), and 2.5 μm (e), respectively

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