File:Cardiac muscle EM02.jpg
Cardiac Muscle Electron Micrograph
Electron micrograph of parts of three cat cardiac muscle fibers and an adjacent capillary in longitudinal section. This original historic (1969) EM has been relabeled to show key features in cardiac muscle ultrastructure. At the light microscope histology level, only the intercalated disc and some cross-striations can typically be seen using histological stains.
The cardiomyocytes (cardiac muscle cells) are packed with sarcomeres (for contraction) and mitochondria (for energy) with a nearby capillary for nutrient supply and waste removal.
- Image Top - In a cardiomyocyte (cardiac muscle cell) 2 contractile units (sarcomere) are shown by white arrows. The A and I bands, shown by black arrows, are the regions visible by light microscope as cross-striations.
- Image Bottom - The 2 cardiomyocytes (cardiac muscle cells) are coloured (labeled cell 1 and cell 2) and are joined by an intercalated disc.
- Image Bottom Right - A capillary (red) enclosed by an endothelial cell and its basement membrane contains a red blood cell.
- In D - Intercalated disc, the two lower 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.
- ↑ D W Fawcett, N S McNutt The ultrastructure of the cat myocardium. I. Ventricular papillary muscle. J. Cell Biol.: 1969, 42(1);1-45 PMID:4891913 | PMC2107571
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Original article figure (FIG. 1) has been scaled and rotated. Labels and colours have also been added to the original image.
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|current||14:39, 6 August 2012||1,072 × 735 (224 KB)||Z8600021|
|14:35, 6 August 2012||1,072 × 735 (222 KB)||Z8600021||==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 interca|
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