Inferiorly: Body of hyoid bone.

Laterally: Right and left anterior bellies of digastric.

Floor: Two mylohyoid muscles.

Apex: At inferior end of the symphysis menti.

Contents of submental triangle

Submental lymph nodes. These receive lymph from the following areas:

• Tip of the tongue.
• Floor of the mouth.
• Mandibular incisor teeth and associated gingivae
• Central part of the lower lip.
• Skin of the chin.

Lymph from here drains into submandibular and deep cervical lymph nodes.

Submental veins and arteries. The submental veins unite to form the anterior jugular vein.