Right belly inserted to the median raphe of mylohyoid muscle. Both accessory muscles originated from digastric fossae. In the present case, we report bilateral asymmetric ABD in adult male cadaver. muscle fibres is of tremendous clinical importance. However, reporting of possible attachments and arrangement of. The anomalies of the anterior belly of digastric muscle (ABD) are uncommon. Even they cause difficulty in the clinical diagnosis of pathological masses in the submental area and also interfere with successful surgeries in the anterior neck region. It is relevant both for the interpretation of radiological images and during surgical procedures such as dissection of the anterior belly of the digastric for a malignant disease and graft positioning.Īccessory bellies of digastric muscle may alter the movements of mandible and hyoid bone. Knowledge of this variant will help to avoid confusion with pathological conditions of the floor of the mouth and the submental region. This observation of a median accessory digastric muscle has not previously been reported. Aberrant anterior bellies of the digastric muscles are uncommon and occur bilaterally or unilaterally. No other morphologic abnormalities were found in this region. The muscle elevated the hyoid bone and depressed the mandible when appropriate stress was applied. The rest of the muscle had a median course, with the cranial end inserting into the mandible between the digastric fossae. Lower portion of the fibers, at the right base of the muscle, initially traveled perpendicular to the lower fibers of the right mylohyoid. Its base arose from the front of the body of the hyoid bone near its upper border. It appeared as a flat quadrilateral sheet. The muscle was located between the anterior bellies of the digastrics, external to the mylohyoid and deep to the platysma.
A median accessory digastric muscle was revealed during a dissection of the submental region.
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