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Development of Muscle Fibers in the Fetal Pig¹

University of California, Davis 95616

Abstract

Prenatal development of muscle fibers was examined cytochemically in the fetal pig. Fibers which are to become ß fibers are observed prior to the appearance of fibers. As was observed in the fetal lamb (Ashmore et al., 1972) the ß fibers appear to act as a structural framework upon which a fiber development subsequently occurs. It is suggested that a) selection pressure for muscularity could prolong, or increase the rate of a fiber formation during the later stages of fetal development, b) that additional increases in the number of fibers may be reflected in an increase in the W fiber population and c) that the central location of "red" fibers in fasciculi of mature pig muscles is explained by the pattern of fiber type development in the fetus.

¹ Supported in part by grants from the Muscular Dystrophy Association of America and Public Health Service Grant FR06138, HSAA.

² Laboratory of Muscle Biology, Department of Animal Science, University of California, Davis.

³ Department of Food Science and Nutrition, University of Minnesota, St. Paul.

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