Bilateral variation of anterior belly of digastric muscle

R. A. Azeredo; L. A. Cesconetto; L. H. S. Torres

doi:10.4322/jms.095215

Journal of Morphological Sciences, Inhaltsverzeichnis

CC BY-NC-ND 4.0 · Journal of Morphological Sciences 2016; 33(04): 215-217
DOI: 10.4322/jms.095215

Case Report

Thieme Revinter Publicações Ltda Rio de Janeiro, Brazil

Bilateral variation of anterior belly of digastric muscle

Autor*innen

R. A. Azeredo

¹Departament of Morphlogy, Health Science Center, Universidade Federal do Espírito Santo - UFES, Av. Marechal Campos, 1468 - térreo, CEP 29043-900, Vitória, ES, Brazil
L. A. Cesconetto

²Health Science Center, Universidade Federal do Espírito Santo - UFES, Av. Marechal Campos, 1468 - térreo, CEP 29043-900, Vitória, ES, Brazil
L. H. S. Torres

²Health Science Center, Universidade Federal do Espírito Santo - UFES, Av. Marechal Campos, 1468 - térreo, CEP 29043-900, Vitória, ES, Brazil

Abstract

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Abstract

Introduction: Digastric is a suprahyoid muscle and usually consists of two bellies. Its action consists in drawing the mental region downwards and backwards when opening the mouth, resulting in the depression of the mandible. Methods and Results: During a routine dissection of the cervical region, a muscle bundle arising from the intermediary tendon going towards the middle line was found. The supranumerary belly arised from the intermediary tendon so that some bundles inserted on the middle rafe and others continued towards the mento and inserted on the belly of mylohyoid muscle at the same side. These anatomic variations on the anterior belly of the digastric muscle could be significant during surgical procedures involving the submental region. Conclusion: Besides this surgical importance, we suggest that these supranumerary bellies have no direct action on the mandible, but on the floor of the mouth, due to its insertions on the mylohyoid muscle.

Keywords

anatomy - anatomic variation - digastric muscle

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