Muscle Growth: The Problem of Muscle Fibers with an Intrafascicular Termination

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Abstract
Numerous intrafascicularly terminating fibers were found in several porcine and bovine muscles. They were demonstrated by maceration, microdissection and histological sectioning. The majority of terminations were formed by the gradual tapering of fibers over a length of a few millimeters. Tapered terminations were readily found in thick frozen sections, due to their affinity for methylene blue injected before sectioning, and they were anchored within the endomysium of adjacent normal diameter fibers. Tapered intrafascicular terminations were found in cattle ranging from less than 1 month to 8 years of age. Muscles from variably emaciated and senescent cattle were characterized by fibers of larger diameter than those from younger animals of greater weight. It is suggested that, in developing bovine muscles, intrafascicularly terminating fibers grow at a slower rate than those with completely tendinous insertions, and that, in senescent bovine muscles, intrafascicularly terminating fibers decrease in length by terminal degeneration. Copyright © 1972. American Society of Animal Science . Copyright 1972 by American Society of Animal Science

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