What is the action of the superior fibers of the trapezius?

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Multiple Choice

What is the action of the superior fibers of the trapezius?

Explanation:
The upper fibers of the trapezius elevate the scapula and help with upward rotation of the scapulothoracic joint. Their fibers attach to the lateral clavicle and the acromion, so when they contract they lift the shoulder girdle upward. That elevation often goes hand in hand with upward rotation, which is essential for overhead arm movements because it positions the glenoid to meet the humerus as you raise the arm. The other actions listed are performed by other parts of the trapezius (depression by the lower fibers, adduction by the middle fibers) or aren’t primary actions of the superior fibers.

The upper fibers of the trapezius elevate the scapula and help with upward rotation of the scapulothoracic joint. Their fibers attach to the lateral clavicle and the acromion, so when they contract they lift the shoulder girdle upward. That elevation often goes hand in hand with upward rotation, which is essential for overhead arm movements because it positions the glenoid to meet the humerus as you raise the arm. The other actions listed are performed by other parts of the trapezius (depression by the lower fibers, adduction by the middle fibers) or aren’t primary actions of the superior fibers.

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