Three-Dimensional CT Examination of the Mastication System in the Giant Anteater

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概要

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• 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.

• Zoological Society of Japanの論文

著者

• 小宮 輝之

  上野動物園

• 小宮 輝之

  多摩動物公園

• KOMIYA Teruyuki

  Ueno Zoological Gardens

• Endo Hideki

  Univ. Tokyo Tokyo Jpn

• Endo H

  The University Museum The University Of Tokyo

• Endo Hideki

  Section Of Morphology Primate Research Center Kyoto University

• ENDO Hideki

  The University Museum, The University of Tokyo

• Endo Hideki

  The University Museum The University Of Tokyo

• Komiya Teruyuki

  Ueno Zoological Gardens Tokyo Jpn

• NIIZAWA Nobuharu

  Animal Medical Center, College of Bioresource Sciences, Nihon University

• Niizawa Nobuharu

  Animal Medical Center College Of Bioresource Sciences Nihon University

• KIMURA Junpei

  College of Veterinary Medicine, Seoul National University

• KIMURA Junpei

  Department of Veterinary Anatomy, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University

• 小宮 輝之

  恩賜上野動物園

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