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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.
You know that you have trapezius muscle strain when you have pain in your arm muscles and it radiates to the back of your neck. You may also have pain in your thoracic region and your shoulder blades.