title: Abnormal anterior belly of the digastric muscle: a proposal for the classification of abnormalities.
abstract: We recognized an abnormal anterior belly of the digastric muscle in an 83-year-old male cadaver. Three muscle bundles were observed on the left anterior belly: (i) attached to the left digastric fossa; (ii) attached to the right digastric fossa; and (ii) attached to the raphe of the mylohyoid muscle. Four muscle bundles were recognized on the right anterior belly: (i) attached to raphe of the mylohyoid muscle; (ii, iii) attached to the exterior surface on the base of the mandible from the raphe of the mylohyoid muscle; and (iv) attached to the interior surface on the base of the mandible from the raphe of the mylohyoid muscle. The raphe of the mylohyoid muscle was curved significantly to right and the four abnormal bundles found on the right anterior belly (see above) were attached to its curved point.
authors.affiliation: First Department of Oral Anatomy, School of Dentistry, Iwate Medical University, Morioka, Japan. akifuji@iwate-med.ac.jp
authors.forename: Akira
authors.initials: A
authors.lastname: Fujimura
authors.forename: Masao
authors.initials: M
authors.lastname: Onodera
authors.forename: Xin-Yan
authors.initials: XY
authors.lastname: Feng
authors.forename: Tokuji
authors.initials: T
authors.lastname: Osawa
authors.forename: Eisuke
authors.initials: E
authors.lastname: Nara
authors.forename: Satomi
authors.initials: S
authors.lastname: Nagato
authors.forename: Yoko
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: Nobuhide
authors.initials: N
authors.lastname: Sasaki
authors.forename: Yohichiro
authors.initials: Y
authors.lastname: Nozaka
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019521:Body Patterning; D006801:Humans; D006928:Hyoid Bone / Q000002:abnormalities / Q000473:pathology; D008297:Male; D008334:Mandible / Q000002:abnormalities / Q000473:pathology; D008340:Mandibular Nerve / Q000033:anatomy & histology / Q000473:pathology; D008410:Masticatory Muscles / Q000002:abnormalities* / Q000294:innervation / Q000473:pathology*; D019767:Maxillofacial Abnormalities / Q000145:classification* / Q000473:pathology*; D012016:Reference Values