Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System: Alphabetical Listing of Muscles: D
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
A close relationship exists between the mylohyoid and the anterior belly of the digastric. There is usually some exchange of fibers sometimes amounting to complete fusion of the two muscles. Doubling of the anterior belly is a rather common variation, and the anterior bellies of opposite sides may be united by conversion of the fascia that typically passes between them into muscular tissue. An independent muscle, mentohyoid (Macalister), extending between the body of the hyoid and the symphysis of the mandible, may be found along the medial border of the anterior belly, and may be considered as a separate part of the digastric. The anterior belly may be absent. Tri- and quadrigastric muscles have been reported.
The variability of the anterior belly of the digastric muscle can be seen in the following listing provided by Mori from Loth. Atypical anterior bellies were found in 6.6% of cases by Hallett (1847), in 5.9% by Wood (1862), in 6.0% by LeDouble (1891), in 12% by Loth, in 26% by Bavero (1896), in 36% (fetal) by Bianchi (1896), in 48% by Stracher (1908), in 51% by Bianchi (1890), in 52% by Ruffini (1908), in 52.7% by Stracker (1928), in 63.3% by Zalbek (1933) and in 73% by Bertalli (1927). The anterior belly of digastricus is a branchiomeric muscle derived from the mesoderm associated with the branchial arches. It is innervated by the trigeminal (mandibular division) nerve.
Syn.: m. biventer mandibulae, biventer, digastricus maxillae inferioris, digastricus ossis hyoidei (M.J. Weber), Zweibauchiger Unterkiefermuskel, digastrique.
Varieties of the Anterior Belly of Digastricus.
from Ruffini, 1908
Varieties of the Anterior Belly of Digastricus.
from Ruffini, 1908
Anterior Belly of Digastricus
Laboratory specimen, 1993.
University of Iowa.
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Corsy, F. (1920) Un nouveau cas d'appareil hyoïdien. Anomalies multiples des muscles du deuxième arc. Soc. Biol., Comptes Rendus Hebdomadaires des Seances et Memoires. 83:366-368.
Dratsch, S. (1930) Ein Fall von variationen des M. digastricus mandibulae. Anat. Anz. 69:81-82.
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Focacci, M. (1901) Contribution a l'étude du muscle interdiagastrique de Bianchi. Arch. Ital. Biol. 36;476.
Gruber, W. (1880 a) Über den Musculus trigastricus maxillae inferioris. Arch. Path. Anat. Physiol. Klin. Med. 81:445-449.
Gruber, W. (1880 b) Musculus digastricus maxillae inferioris mit Ursprung seines vorderen Bäuches an und hinter der Mitte des Seitentheiles der Maxilla im Bereiche der Strecke zwischen dem Ansatze des masseter und dem Ursprung des M. depressor anguli oris. Arch. Path. Anat. Physiol. Klin. Med. 81:449-453.
Gruber, W. (1885) Auftreten der Bäuche des Musculus digastricus maxillae inferioris als selbständige Muskeln Musculus mento-hyoideus et mastoideo-maxillaris. Arch. Path. Anat. Physiol. Klin. Med. 101:253-255.
Hahn, H. (1910) Eine seltene Anomalie des vordern Bauches des M. digastricus mandibulae. Zeitschrift für Morphologie und Anthropologie. 13:281-288.
Macalister, A. (1875) Additional observations on muscular anomalies in human anatomy (third series), with a catalogue of the principal muscular variations hitherto published. Trans. Roy. Irish Acad. Sci. 25:1-134.
Mori, M. (1964) Statistics on the musculature of the Japanese. Okajimas Fol. Anat. Jap. 40:195-300.
Ruffini, A. (1908) Sul muscolo interdigastrico di Bianchi e sull'aponeurosi soprajoidea od intermediojoidea. Rarissimo caso di mancanza bilaterale del ventre anteriore del m. digastrico della mandibola. Arch. Ital. Anat. e di Embriol. 7:578-601.
Tanaka, M., Onda, S., and T. Tsukamoto. (1958) The situation of the hyoidal muscles (M. digastricus mandibulae). Kaibogaku Zasshi. 33:Supple., 113-114. In Japanese.
Tojima, T. and T. Nakano. (1950) Study on the venter anterior of the M. digastricus mandibulae. Iwate Daigaku Kaibogakukyoshitsu Gyosekishu. 1:111-123. In Japanese.
Tsukamoto, T. and S. Tanaka. (1958) On the digastricus mandibulae, M. stylohyoideus. Tokyo Shikadaigaku Kaibogakukyoshitsu Gyosekishu. 8:1-4. In Japanese.
Yamada, F. (1933) The M. digastricus mandibulae of the fetus and new-born. Keio Igaku Zasshi 13:1503-1507. In Japanese.
Yamada, F. (1935) Observation on the venter anterior of the diagastricus of the adults and fetus. Kaibogaku Zasshi. 8:303-308. In Japanese.
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