COMPARATIVE STUDIES ON MUSCLE STRUCTURE OF THE M. TRICEPS SURAE AND M. PLANTARIS IN MAN AND MONKEY

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  • KATAOKA Junko
    Department of Anatomy, School of Medicine, Showa University

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  • ヒトとサルの下腿三頭筋および足底筋における筋構築の比較研究

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To elucidate the changes in muscle structure accompanied the development to bipedalism from quadrupedalism in primates, we examined the shape and the myofibrous organization of M, triceps surae and M, plantaris. The muscle sample examined were gotten from 10 human (7 males and 3 females) and 12 crab-eating macaques (4 males and 8 females) . The shapes of muscle were examined by the measurements below mentioned and the myofibrous organization were analysed by H.E. stained thin section. Following results were obtained: On the myofibrous organization, the cross-sectional area and the total number of muscle fibers were most predominant in lateral gastrocnemius (L.G.), followed by medial gastrocnemius (MG), soleus (Sol) and plantaris (P1) in monkey. And the number of muscle fibers per sq mm had no statistical difference in each muscle except P1. Cross sectional area and total number of muscle fibers in men were most predominant in Sol, followed by MG, LG, and P1. The mean size of muscle fibers in monkey were 2003.3 μ2 by Pl, 1812.2 μ2 by LG, 1928.9 by Sol and 1578.3 μ2 by MG and those in men, were 3911.9 μ2 by Sol, 1820.8 μ2 by MG, 1001.2 μ2 by LG and 1000.0 μ2 by P1. On the morphological measurements, the relative length of tendon of monkey was shorter than man's. The breadth in MG and LG of monkeys were relatively wider than man, but Sol of man was wider than monkey's. From muscle structure which induced 39 morphometrical measurements and some imformations of myofibrous organization, especially about Sol and LG, there were some characteristic differences between men and crab-eating monkeys accompanied with their locomotive pattern.

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