Anterior Triangle of the Neck In Detail

The neck is arbitrarily subdivided into two triangles by the sternocleidomastoid muscle:

Triangles of the Neck	Anterior Triangle	Posterior Triangle
	submental (smen) submandibular (sm) muscular-visceral (mus) carotid (car)	occipital supraclavicular (omoclavicular)

Starting above the hyoid bone in the anterior triangle, we have two small triangles: submental and submandibular (or digastric). We will start this study by looking at the submandibular triangle first then the submental.

The Submandibular Triangle

Once the skin over the mandible and upper neck is removed, you can identify the submandibular triangle and its boundaries. Boundaries mastoid & mandible above anterior belly of digastric anteriorly (abd) posterior belly of digastric (pbd) and stylohyoid posteriorly (sh)