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Applied Microscopy
Fig. 1 | Applied Microscopy

Fig. 1

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

Fig. 1

Photo micrographs of toluidine blue-stained plastic-embedded sections of the heart in the spider, L. mactans. a, b: Spider heart is not divided into chambers, but consists of a simple muscular tube. Arrows indicate muscle fibers (Ms) surrounding numerous hemocytes (He). c, d: Cardiac muscle fibers are striated, and tightly connected to other cells by the intercalated disc (Cd). Double arrowheads indicate the location of intercalated discs between adjacent cardiac muscle fibers. All scale bar indicates 50 μm

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