The trapezius and sternocleidomastoid muscles and the clavicle form a landmark called the _____ triangle.

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Anatomically, these landmarks comprise what is referred to as the posterior triangle, which includes the posterior cervical lymph nodes. The anterior triangle is adjacent to the posterior triangle, formed by the medial borders of the sternocleidomastoid muscles and the mandible. The relationship of neck muscles to each other and to adjacent bones creates the anatomic landmarks known as triangles.

The Trapezius and Sternocleidomastoid Muscles and the Clavicle Form a Landmark