Muscular system - OCR Agonist and antagonist muscle pairs. ... The trapezius muscle can act as a fixator when the biceps is flexing the elbow joint.

What causes a trapezius muscle strain? Find out what you need to know about this problem with your upper back muscle, including how to treat it and how to prevent it.

A trapezius strain can happen as the result of an acute injury or from long-term overuse. Learn what a trapezius strain feels like and how it's treated.

The trapezius, traps, trapezoid muscle is in the upper back and helps the neck, shoulders, and arms move. Learn more about the causes and treatment of trapezius pain.

The trapezius gets its name because the muscle resembles a trapezoid. (In case you forgot high school geometry—no shade, this applies to us too—that’s a shape with four sides, two of which ...