The trapezius lower fibers are involved concentrically in all of the following actions except:

Question

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The trapezius muscle is divided into upper, middle, and lower fibers, each responsible for different movements. The lower fibers of the trapezius are involved in upward rotation of the scapula, depression of the scapula, and adduction (retraction) of the scapula. They are not involved in the elevation of the scapula; this action is primarily performed by the upper fibers of the trapezius.

The Trapezius Lower Fibers Are Involved Concentrically in All of the Following