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Trapezius Muscle. The trapezius is one of the major muscles of the back and is responsible for moving, rotating, and stabilizing the scapula (shoulder blade) and extending the head at the neck. It is a wide, flat, superficial muscle that covers most of the upper back and the posterior of the neck.
The delivery of dental care places high demands on this muscle, and can result in a painful condition called trapezius myalgia. Symptoms include pain, spasms, or tenderness in the upper trapezius muscle, often on the side of the mirror, or retracting, arm (Fig.1).rigger point self-treatment. Trigger points in the upper trapezius muscles can refer pain to the temple, cause a headache behind the eye, or pain in the back of the neck.