A COMPARATIVE STUDY ON MUSCLE FIBER ORGANIZATION IN HUMAN HAND MUSCLES

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  • AJIRI Teizo
    Department of Anatomy, School of Medicine, Showa University

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Other Title
  • ヒトとサルの手筋筋線維構成の比較研究
  • ヒト ト サル ノ テスジ キンセンイ コウセイ ノ ヒカク ケンキュウ

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Abstract

The muscle fiber organization of the intrinsic muscles of the human hand and that of the crab-eating monkey were studied by comparison to clarify the function of the muscles of the human hand. The following results were obtained : 1) Concerning the weight of the human hand muscles ; the thenar was the heaviest, followed by the intermediate and the hypothenar, the lightest among the three individual muscle groups. The abductor pollicis was the heaviest in the individual muscles of the human hand ; the opponens pollicis, first and second dorsal interossei and the abductor digiti minimi were ranked next in order of weight. Compared with the hand muscles of the monkey, the weight of all muscles of the human hand was 66.15gr., or 10×heavier than that of the monkey hand. In man, the relative weight of corresponding hand muscles was greater than the monkey in the abductor pollicis, opponens pollicis and second dorsal interossei and lesser in the flexor pollicis brevis, abductor digiti minimi and palmar brevis, respectively. 2) A positive correlation was observed between the total number of muscle fibers and the relative hand muscle weight in both man and monkey. 3) Concerning the size of the human hand muscle fibers ; those of the dorsal interossei were largest (1313 μ2), and the lumbrical was the smallest. In man, the individual muscles were larger in the first and second dorsal interossei and adductor pollicis and opponens pollicis muscles than in others. Compared with the corresponding muscles of the monkey hand, the size of muscle fiber was less human muscles, as compared with monkey muscles, especially in the hypothenar and palmar interosseus muscles. 4) From these facts it was concluded that, in man, those hand muscles involved in the mechanisms of gripping and pinching were well developed, and those in hanging were well developed in the monkey.

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