File:Cardiac muscle EM01.jpg

Cardiac Muscle Electron Micrograph

Electron micrograph of parts of three cat cardiac muscle fibers and an adjacent capillary in longitudinal section. This is a historic (1969) EM showing key features in cardiac muscle ultrastructure. Only the intercalated disc and some cross-striations can typically be seen in the light microscope histology slides.

• In D - Intercalated disc, the two upper cells are joined end to end by a typical steplike intercalated disc.
• Mt - Rows of mitochondria appear to divide the contractile substance into myofibril-like units but, unlike the true myofibrils of skeletal muscle, these branch and rejoin and are quite variable in width.
• Lp - Lipid droplets somewhat distorted in specimen preparation are found between the ends of the mitochondria.
• Cap - Capillary.

Original image X 15,000.

Reference

<pubmed>4891913</pubmed>| PMC2107571

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