File:Cardiac muscle EM01.jpg

From Embryology

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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

Copyright

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


Cite this page: Hill, M.A. (2024, February 22) 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

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Date/TimeThumbnailDimensionsUserComment
current12:52, 6 August 2012Thumbnail for version as of 12:52, 6 August 20121,072 × 735 (231 KB)Z8600021 (talk | contribs)==Cardiac Muscle EM== Electron micrograph of parts of three cat cardiac muscle fibers and an adjacent capillary (Cap) in longitudinal section. The two upper cells are joined end to end by a typical steplike intercalated disc (In D).Rows of mitochondria (