Which action describes the middle fibers of the trapezius?

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Prepare for the NHI Eastern Kinesiology Test with our comprehensive quiz. Utilize flashcards and multiple-choice questions, complete with hints and detailed explanations. Ready yourself for success!

Multiple Choice

Which action describes the middle fibers of the trapezius?

Explanation:
The middle portion of the trapezius is specialized for pulling the scapula toward the spine and keeping it stable on the thorax. When these fibers contract, they retract or adduct the scapula, bringing the medial border closer to the vertebral column, and they also help hold the scapula steady during arm movements. Elevation of the scapula is driven mainly by the upper fibers, while depression is mainly a job of the lower fibers, and upward rotation involves the lower trapezius with the serratus anterior. So the best description for the middle fibers is adducting the scapula and stabilizing it.

The middle portion of the trapezius is specialized for pulling the scapula toward the spine and keeping it stable on the thorax. When these fibers contract, they retract or adduct the scapula, bringing the medial border closer to the vertebral column, and they also help hold the scapula steady during arm movements. Elevation of the scapula is driven mainly by the upper fibers, while depression is mainly a job of the lower fibers, and upward rotation involves the lower trapezius with the serratus anterior. So the best description for the middle fibers is adducting the scapula and stabilizing it.

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