Cardiac Muscle MyocardiumLeft Ventricle

Longitudinal section through the myocardium of the left ventricle. Note the branching of the cardiomyocytes. The in part terrace-like arranged struts 0 (disci intercalares) are very noticeable because they stain heavily. Fibril-free sarcoplasm surrounds the nuclei like a cap □.

1 Perinuclear space

2 Branching of the cardiomyocytes

3 Vein with erythrocytes

4 Intercalated discs(disci intercalares)

5 Network lamella of the cardiac muscle cell

6 Interstitial connective tissue

7 Cardiac muscle cell with nucleus

8 Capillary

9 Endothelial nucleus 172 10 Nucleus of a fibrocyte

Stain: brilliant black-toluidine blue-safranin; magnification: x 200 Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy © 2003 Thieme All rights reserved. Usage subject to terms and conditions of license.

Microscopic Anatomy Cardiac Muscle

This is another cross-section through the cardiac muscle tissue, which gives a clear picture of the Cohnheim grouping. Here, myofibrils have aggregated to lamella in a radial formation. The sarcoplasm-rich spaces are free of fibrils and appear light. The size differences among nuclei should be noted [2. In the sparse connective tissue between heart muscle cells are fibrocytes and capillaries. It should also be noted that the apparent variations in the diameters of the cardiac muscle fibers (cardiomyocytes) depend on the presence or absence of their cell nuclei in the section (cf. Fig. 239).

1 Nucleus of a connective tissue cell

2 Nucleus of a cardiac muscle cell

3 Capillary

<L> Stain: alum hematoxylin; magnification: x 600

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