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Applied Microscopy
Fig. 3 | Applied Microscopy

Fig. 3

From: Fine structure of the intercalated disc and cardiac junctions in the black widow spider Latrodectus mactans

Fig. 3

Transmission electron micrographs of the intercalated disc in the spider, L. mactans. a: Intercalated discs (Cd) run perpendicular to the direction of the myofibrils (Mf) dividing adjacent cardiac muscle cells. b: Well-developed mitochondria (Mi) are located very close to the intercalated disc. c: Intercalated discs contain gap junctions and desmosomes (rectangles) at the junctional area between muscle fibers. d: In cross section, isolated polygonal tubules representing the site of the gap junction, and adherens junction (Aj) appeared. Tt: T-tubule. Scale bars indicate 2 μm (A) and 1 μm (B-D), respectively

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