The anterior belly of the digastric arises from the digastric fossa on the inferior surface of the mandibular symphysis, with a short tendinous origin that merges with the muscle belly. Anteriorly, both digastric bellies are connected by the intermediate tendon which is held to the hyoid by the stylohyoid tendon loop.
The anterior digastric tendon origin is at the mandibular digastric fossa, a consistent landmark in anterior neck dissection and submental surgery. Digastric triangle dissection exposes the submandibular gland by releasing the anterior belly from the mylohyoid. Ranula and submandibular gland calculi present as swellings in the anterior digastric triangle. The muscle is used in platysma and digastric flaps for floor of mouth reconstruction.
Traction injury at the mandibular digastric fossa origin producing submental pain and tenderness, exacerbated by forced mouth opening, occasionally confused with mandibular symphysis pathology.
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