Masticatory muscle architecture in a murine murid, <i>Rattus rattus</i>, and its functional significance

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  • Satoh Kazuhiko
    Department of Oral Anatomy, Asahi University School of Dentistry
  • Iwaku Fumihiko
    Department of Oral Anatomy, Asahi University School of Dentistry

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  • Masticatory muscle architecture in a murine murid, Rattus rattus, and its functional significance

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The internal architecture of the masticatory muscles in a murine murid, Rattus rattus, was examined and compared with our previous description of Peromyscus maniculatus, which seems to have primitive jaw muscles for muroid rodents. Remarkable differences were observed mainly in the masseter muscle and corresponding aponeurosis. The anterior and posterior mandibular aponeuroses for insertion of the masseter deep layer are united as a single sheet in Rattus. In Peromyscus, both the origin and insertion of the anterior part of the masseter deep layer lie on the aponeurosis. In Rattus, however, the deep fibers of the anterior part form a muscular attachment to the bone surface at either end. This characteristic suggests that the maximum angle of gape is increased in murine murids, which allows them to ingest various-sized foods.<br>

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  • Mammal Study

    Mammal Study 33 (1), 35-42, 2008

    THE MAMMAL SOCIETY OF JAPAN

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