CT Observation of the First Metacarpal Adduction in a Carcass of the Chimpanzee

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  • ENDO Hideki
    Morphology Section, Primate Research Institute, Kyoto University
  • YOSHIHARA Koichiro
    Tama Zoological Park
  • HASEGAWA Toshikazu
    Department of Life Sciences, School of Arts and Sciences, The University of Tokyo
  • YOSHIKAWA Yasuhiro
    Department of Biomedical Science The University of Tokyo
  • HAYASHI Yoshihiro
    Department of Veterinary Anatomy, Faculty of Agriculture, The University of Tokyo
  • SAKAI Takeo
    Department of Preventive Veterinary Medicine and Animal Health College of Bioresource Sciences, Nihon University
  • ITOH Takuya
    Department of Preventive Veterinary Medicine and Animal Health College of Bioresource Sciences, Nihon University
  • KOIE Hiroshi
    Laboratory of Comprehensive Veterinary Clinical Studies College of Bioresource Sciences, Nihon University
  • KIMURA Junpei
    Department of Veterinary Anatomy, College of Bioresource Sciences, Nihon University

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  • チンパンジーの遺体を用いた第一中手骨内転運動のCT断層像観察

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Abstract

We examined the adduction movement of the first metacarpal during the manipulating action of the chimpanzee (Pan troglodytes) by using the computed tomography (CT) techniques. We demonstrated by nondestructive method that the first metacarpal adducted and its shaft rotated from the first carpometacarpal joint. The trapezium and the other carpals did not move in the adductor action of the first metacarpal and did not contribute to the gripping action. The movement area of the first metacarpal was three-dimensionally restricted to the medial region of the second metacarpal. Some reports pointed out that the first metacarpal and the first phalanges did not act as a highly-functioned grasper in the chimpanzee unlike in the human and some fossil hominids, and our CT sections also explained that the first metacarpal movements and the thumb opposability were not sufficient to grasp object for the chimpanzee.

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