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抄録

The gross anatomy of the mastication system of the giant anteater (Myrmecophaga tridactyla) was examined by means of three-dimensional image analysis. The anteater rotates the mandibles medially and laterally to control its tongue when it is elongated and to house it when it is relaxed. Three-dimensional CT image analysis demonstrated that the shape and size of the oral cavity changes drastically when the mandibles are rotated. The oral cavity expands bilaterally when the dorsal part of the mandibles bend medially. Macroscopic observations and muscle-weight data supported the observation that the superficial temporal and medial pterygoid muscles act as the main medial and lateral rotators of the mandible, respectively. The low height of the mandibular ramus and the incomplete zygomatic arch in this species represent adaptations for the rotational movement of the mandibles, since they both contribute to the medially oriented transmission of force from the temporal muscles and to preventing collision between the mandibles and the cranium during the rotational movement.

収録刊行物

  • Zoological science

    Zoological science 24(10), 1005-1011, 2007-10

    Zoological Society of Japan

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    120002056259
  • NII書誌ID(NCID)
    AA10545874
  • 本文言語コード
    ENG
  • 資料種別
    Journal Article
  • ISSN
    02890003
  • NDL 記事登録ID
    9751302
  • NDL 雑誌分類
    ZR4(科学技術--生物学--動物)
  • NDL 請求記号
    Z53-Y164
  • データ提供元
    CJP引用  NDL  IR 
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