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- sternocleidomastoid muscle forms the posterior border
- mandible forms the superior border
- midline of neck forms the anterior border
The anterior triangle (Figure 25.1) is further divided into a suprahyroid region that consists of a unpaired submental triangle and paired submandibular triangle, and an infrahyroid region that consists of a paired muscular triangles and, (step 5), paired carotid triangles, (step 3).