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 cat cardiac ventricular muscle ultrastructure. Only the intercalated disc and some cross-striations can typically be seen in the light microscope histology slides.

Legend

• 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.

Links: EM Image | EM Image cells labeled | HM Practical - Cardiac Histology

Reference

Fawcett DW & McNutt NS. (1969). The ultrastructure of the cat myocardium. I. Ventricular papillary muscle. J. Cell Biol. , 42, 1-45. PMID: 4891913

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Original article figure (FIG. 1) has been scaled and rotated.

Cite this page: Hill, M.A. (2024, April 25) Embryology Cardiac muscle EM01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Cardiac_muscle_EM01.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G