Block3/Fig.8a 93W3533 Heart, Purkinje fibers, ih.

block4_16.jpg - Fig.8a 93W3533 Heart, Purkinje fibers, ih. Purkinje fibersare the components of the heart¡¦s conduction system. Theyare more easily observed in a slide stained with ironhematoxylin. While most common in the subendothelial space,they can also be observed in the myocardium. ComparePurkinje fibers with cardiac muscle fibers. Note largernumbers of myofibrils and smaller cell size in cardiac musclefibers. The Purkinje fibers contain large amounts of invisibleglycogen particles, which appear as pale-staining regions thatoccupy the center portion of the cell surrounded by themyofibrils.Fig.8b Cardiac muscle fiber, ls. Iron hematoxylin staining ofcardiac muscle highlights the cross striations and intercalateddiscs. The red blood cells are stained in black dots. Thecapillary diameter is about the same size as a red blood cell.In longitudinal section, the capillaries will look to appear asrows of red blood cells.

Fig.8a 93W3533 Heart, Purkinje fibers, ih. Purkinje fibers are the components of the heart¡¦s conduction system. They are more easily observed in a slide stained with iron hematoxylin. While most common in the subendothelial space, they can also be observed in the myocardium. Compare Purkinje fibers with cardiac muscle fibers. Note larger numbers of myofibrils and smaller cell size in cardiac muscle fibers. The Purkinje fibers contain large amounts of invisible glycogen particles, which appear as pale-staining regions that occupy the center portion of the cell surrounded by the myofibrils.

Fig.8b Cardiac muscle fiber, ls. Iron hematoxylin staining of cardiac muscle highlights the cross striations and intercalated discs. The red blood cells are stained in black dots. The capillary diameter is about the same size as a red blood cell. In longitudinal section, the capillaries will look to appear as rows of red blood cells.

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