Bilateral, asymmetric anomalies of the anterior bellies of digastric muscles

  • Yamazaki Yosuke
    Division of Microscopic Anatomy, Graduate School of Medical and Dental Sciences, Niigata University Department of Anatomy, Nihon University School of Dentistry Division of Functional Morphology, Dental Research Center, Nihon University School of Dentistry
  • Shibata Masahiro
    Division of Gross Anatomy and Morphogenesis, Graduate School of Medical and Dental Sciences, Niigata University
  • Ushiki Tatsuo
    Division of Microscopic Anatomy, Graduate School of Medical and Dental Sciences, Niigata University
  • Isokawa Keitaro
    Department of Anatomy, Nihon University School of Dentistry Division of Functional Morphology, Dental Research Center, Nihon University School of Dentistry
  • Sato Noboru
    Division of Gross Anatomy and Morphogenesis, Graduate School of Medical and Dental Sciences, Niigata University

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Bilateral, asymmetric anomalies of the anterior bellies of digastric muscles were observed during dissection of the submental region. Specifically, four extra muscle bundles were found between the anterior bellies of the digastric muscle. Although anomalies of the anterior bellies of digastric muscles are often observed, this complicated pattern of digastric anomalies has not been previously reported. Our findings and previous observations illustrate the morphogenetic complexity of the anterior belly of the digastric muscle derived from the first pharyngeal arch, which gives rise to jaw musculature such as the mylohyoid muscle. (J Oral Sci 53, 523-527, 2011)

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