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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.
Trapezius III: Origin: Spinous processes of seventh cervical and upper three thoracic vertebrae Insertion: Upper border of scapular spine Action: Adduction (retraction) Trapezius IV: Origin: Spinous processes of fourth through twelfth thoracic vertebrae Insertion: Root of scapular spine Action: Upward rotation; depression; adduction (retraction) Note: For entire trapezius muscle: Innervation: Accessory nerve (cranial nerve XI) and branches of C3-4 (same as Thompson and Floyd)