Specificity in Muscle Fiber Types of Loris and Galago, Using the M. tibialis anterior as an Example

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概要

• 論文の詳細を見る

• As part of a series of studies on the function and morphology of skeletal muscles, I investigated histologically the muscle fiber type of the tibialis anterior muscle of lorises which show slow behavior and galagos which show quick behavior, both of which are prosimians, in order to analyze the composition of muscle fiber types of the skeletal muscle from the viewpoint of the locomotion system. The red muscle fiber diameter was the largest, followed in order by that of the intermediate muscle fiber and white muscle fiber in the loris. The frequency of red muscle fiber was the highest, suggesting that the M. tibialis anterior of the loris is the red muscle type with slow contraction. In galagos, by contrast, the red muscle fiber diameter was small, and the diameter of the both intermediate and white muscle fibers was large. The frequency of red muscle fibers was markedly low in galagos, resulting in the prepondence of muscle fibers being white and intermediate muscle fibers. The M. tibialis anterior of galagos thus shows white muscle type or intermediate muscle type, which is fast contraction. Although both loris and galagos belong to the Lorisoidae, there was much difference in the frequency of muscle fiber type between them. Composition of muscle fiber type of these prosimians is the relationship between muscle fiber types and their diameters. These results suggest that the functional difference in behavioral pattern in loris and galagos is reflected by the composition of muscle fiber type.

• 日本霊長類学会の論文

著者

• 木村 忠直

  昭和大学医学部第二解剖学教室

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• Specificity in Muscle Fiber Types of Loris and Galago, Using the M. tibialis anterior as an Example

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