Summary
The semitendinosus muscle of the albino rat is divided grossly into two clearly distinguishable parallel longitudinal bands, one red (anterior) and the other white (posterior). By using mitochondrial content as a criterion for distinguishing fiber types, it is demonstrated that the red portion of the muscle is composed predominantly of red (52%) and intermediate (40%) fibers, while the white portion consists primarily of white fibers (82%). Red fibers have the smallest and white fibers have the largest average diameter. Ultrastructural characteristics of the three fiber types resemble closely those previously described for the rat diaphragm. Red fibers are rich in large mitochondria with abundant cristae, and possess the widest Z lines. In red fibers, the H-band region of the sarcoplasmic reticulum consists of an elaborate network of narrow tubules. In white fibers, mitochondria are smaller, less numerous, and have fewer cristae; Z lines are about half as wide as in red fibers. In the H-band region of the sarcoplasmic reticulum there is a more compact arrangement of broad more or less parallel tubules. Intermediate fibers are similar to red fibers except that their diameters are larger; mitochondria are somewhat smaller and cristae are less abundant; the width of the Z lines is close to that of white fibers. The consistent difference in Z line width establishes this dimension as an important criterion for distinguishing fiber types and facilitates ultrastructural identification, especially of the intermediate fiber.
The clear relationship between color of the semitendinosus and cytological features of its component fibers supports the use of the terms “red”, “white”, and “intermediate” as simple and valid designations for fiber types in mammalian skeletal muscle. Measurement of the cross-sectional area contributed by each fiber type to the total area indicates that both red and intermediate fibers may contribute to redness in mammalian skeletal muscle.
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An early portion of this work was carried out with MissSharon Whelan (Mrs.Bernard Weiss). The author acknowledges the important contribution of Mr.Richard Stearns through his skillful work on the photographic illustrations and the technical assistance of MissAnn Campbell and Mrs.Joan Normington. — This study was supported by Grant No. HD 01026-04 from the United States Public Health Service.
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Gauthier, G.F. On the relationship of ultrastructural and cytochemical features to color in mammalian skeletal muscle. Z.Zellforsch 95, 462–482 (1969). https://doi.org/10.1007/BF00995217
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DOI: https://doi.org/10.1007/BF00995217