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a triangle bounded by the anterior belly of the digastric muscles, the hyoid bone, and the midline; the mylohyoid muscle forms its floor.
Synonym(s): trigonum submentale [TA]
A superficial region under the chin with its base being the hyoid bone and its right and left walls being the right and left anterior bellies of the digastric muscle. The front wall of the triangle is skin; the back wall is the outer surface of the mylohyoid muscle.
See also: triangle