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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 middle trapezius also helps with trunk side bending and rotation in the upper thoracic spine. And finally the lower trapezius muscle is tasked with stabilizing action bringing the shoulder girdle down. This is the opposite action to that of the upper trapezius (discussed above. ) The Trapezius Muscle as a Breathing Muscle The trapezius is an accessory breathing muscle. This means that it helps open up the small amount of breathing room in the upper chest area.