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Answer: D The anterior triangle of the neck endangerment is outlined by these three structures. The trachea or windpipe is found directly mid-line on the neck, while the mandible serves as the superior border of the site. The SCM or sternocleidomastoid muscle divides the anterior and posterior cervical triangles. Endangerments within this site include the trachea itself, facial nerve, thyroid and external jugular vein.