Bilateral accessory digastric muscles.

Four aberrant muscles occurring in the submandibular region are described. Accessory digastric muscles were found lying in the submental triangle. All four muscles were attached to the mylohyoid raphe. On one side the anterior muscle ran to the mandible while the posterior muscle reached the hyoid bone. Three of these muscles (the exception being that attached to the mandible) fused with the ipsilateral anterior belly of digastric thus presenting an unusual bilateral arrangement.