Anatomy: Dimensions of the foot muscles in the lowland gorilla

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  • OISHI Motoharu
    First Department of Anatomy, School of Veterinary Medicine, Azabu University
  • OGIHARA Naomichi
    Laboratory of Physical Anthropology, Graduate School of Science, Kyoto University
  • ENDO Hideki
    The University Museum, The University of Tokyo
  • KOMIYA Teruyuki
    Ueno Zoological Gardens
  • KAWADA Shin-ichiro
    Department of Zoology, National Museum of Nature and Science
  • TOMIYAMA Tae
    First Department of Anatomy, School of Veterinary Medicine, Azabu University
  • SUGIURA Yosuke
    First Department of Anatomy, School of Veterinary Medicine, Azabu University
  • ICHIHARA Nobutsune
    First Department of Anatomy, School of Veterinary Medicine, Azabu University
  • ASARI Masao
    First Department of Anatomy, School of Veterinary Medicine, Azabu University

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  • Dimensions of the Foot Muscles in the Lowland Gorilla

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We dissected the hindlimb of a female western lowland gorilla and determined the muscle dimensions (mass, fascicle length, and physiological cross-sectional area: PCSA). Comparisons of the muscle parameters of the measured gorilla with corresponding reported human data demonstrated that the triceps surae muscles were larger and had more capacity to generate force than the other muscle groups in both species, but this tendency was more prominent in the human, probably as an adaptation to strong toe-off during bipedal walking. On the other hand, PCSAs of the extrinsic pedal digital flexors and digiti minimi muscles were larger in the western lowland gorilla, suggesting that the foot, particularly the fifth toe, has a relatively high grasping capability in the lowland gorilla.<br>

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