The submental triangle is a single midline triangle under the chin, bounded by the anterior bellies of the two digastric muscles and the body of the hyoid bone. Its floor is formed by the two mylohyoid muscles joined at the midline raphe.
| Location | Under the chin in the midline. |
|---|---|
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Contains lymph nodes that drain the front of the mouth and chin.
The submental lymph nodes in this triangle drain the tip of the tongue, floor of the mouth, lower lip and chin, so they enlarge with infections and cancers in these areas. Thyroglossal duct cysts may appear near its lower edge.
Enlarged, tender submental nodes from infection of the lower lip, chin, front teeth or floor of the mouth.
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