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CHAPTER 4 - MUSCLE TISSUE
Histology Guide
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MICROGRAPH

NAME
EM 137 Cardiac Muscle
TISSUE
Heart, Atrium
IMAGE SIZE
10,000 x 8,786 pixels
335 MB
FILE SIZES
78,919 KB (grayscale)
80,806 KB (color)
MAGNIFICATION
3,750
PIXEL SIZE
1.621 nm
SOURCE
Stanley L. Erlandsen
Department of Genetics, Cell Biology and Development
School of Medicine
University of Minnesota
Minneapolis, MN

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EM 137 Cardiac Muscle

Cardiac Muscle

Cardiac muscle is composed of branched, mononuclear cells (occasionally bi-nucleate) with the nuclei located in the center of the cell. Cardiac muscle cells contain myofibrils composed of longitudinal arrays of sarcomeres.

A longitudinal section of a cardiac muscle cell (green), passing through its nucleus, is visible at the center of the micrograph. Surrounding this central cell are other cardiac muscle cells—one above (tan) and one below (blue).

  • (blue) - in the center of the cell and is mostly euchromatin
  • (dark green) - longitudinal sections of sarcomeres in the cytoplasm
  • (yellow) - well-developed
  • (red) - numerous, large, and densely packed along side myofibrils
  • (cyan)
  • (black) - round granules that include the following organelles
    • Glycogen Granules - non-membrane bound
    • Atrial Secretion Granules - usually near the Golgi apparatus (300 to 400 nm in diameter) and membrane bound
    • Lysosomes - membrane bound
  • Cytoplasm (green)
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