Which statement describes trapezius action?

Which statement describes trapezius action?

• A. Retracts the scapula
• B. Elevates and rotates the scapula
• C. Depresses the scapula
• D. Protracts the scapula

Answer: (B)

The trapezius has different parts that do different things, with the upper fibers elevating the scapula and rotating it upward, the middle fibers retracting the scapula, and the lower fibers depressing the scapula while helping with upward rotation. Saying the muscle “elevates and rotates the scapula” best captures its main action in common movements like lifting the shoulder and turning the shoulder blade upward as the arm raises. The other options either describe actions mainly carried out by other muscles (protraction by serratus anterior; depression by lower fibers but not alone) or describe a partial action (retraction) that isn’t the primary combined action of the trapezius.

The trapezius has different parts that do different things, with the upper fibers elevating the scapula and rotating it upward, the middle fibers retracting the scapula, and the lower fibers depressing the scapula while helping with upward rotation. Saying the muscle “elevates and rotates the scapula” best captures its main action in common movements like lifting the shoulder and turning the shoulder blade upward as the arm raises. The other options either describe actions mainly carried out by other muscles (protraction by serratus anterior; depression by lower fibers but not alone) or describe a partial action (retraction) that isn’t the primary combined action of the trapezius.