Development of the hand and wrist bones in chimpanzees |
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Authors: | Yuzuru Hamada Toshifumi Udono Migaku Teramoto Ikuo Hayasaka |
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Institution: | (1) Section of Morphology, Primate Research Institute, Kyoto University, 484-8506 Inuyama, Aichi, Japan;(2) Kumamoto Primates Park of Sanwa Kagaku Kenkyusho Co. Ltd., Nishikuro-iwa 990, Ohta-O, Misumi-cho, Uto-gun, 869-3201 Kumamoto, Japan |
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Abstract: | Skeletal developmental of chimpanzees was studied cross-sectionally. By application of the TW2 method, we described the skeletal
development of chimpanzees and compared their skeletal development with humans'. A development pattern of chimpanzees repeated
accelerations and decelerations displaying “early-juvenile trough,” “pre-adolescent peak,” “mid-adolescent trough,” and “post-adolescent
peak” in incremental curves. Sex differences in skeletal development are slower development in males during infant and early
juvenile phases, and greater increment around the adolescent phase in males. Females are fully mature at younger ages than
males, e.g. about one and a half years. In comparison with chimpanzees, humans have such characteristics as a longer slower
period of juvenile development and a shorter spurt-like adolescent fast period which ends with full maturity. |
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Keywords: | Pan troglodytes TW2 method Skeletal maturation RUS skeletal system Cross-sectional study Growth and development |
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