Submental space

The submental space is located between the mylohyoid muscle superiorly, the platysma muscle inferiorly, under the chin in the midline. The space coincides with the anatomic region termed the submental triangle, part of the anterior triangle of the neck. 

Boundaries:

• the mylohyoid muscle superiorly
• the investing layer of deep cervical fascia (and this in turn is covered by the platysma muscle) inferiorly
• the inferior border of the mandible anteriorly
• the hyoid bone posteriorly
• the anterior bellies of the digastric muscles laterally. 

Communications

• the submandibular spaces posterolaterally.
• the sublingual space superiorly (via erosion through the mylohyoid).

Contents:

• submental lymph nodes, 
• areolar connective tissue 
• anterior jugular veins.