Which portion of the trapezius is involved in adducting the scapula?

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Multiple Choice

Which portion of the trapezius is involved in adducting the scapula?

Explanation:
Adduction (retraction) of the scapula is produced mainly by the middle portion of the trapezius. Its fibers run horizontally from the spine toward the medial margin of the scapula, so when they contract they pull the scapulaMedially toward the spine, bringing the inner borders closer together. The upper fibers pull the scapula upward and rotate it, aiding in elevation, while the lower fibers pull it downward and assist in upward rotation. So for moving the shoulder blades toward the spine, the middle fibers do the primary work.

Adduction (retraction) of the scapula is produced mainly by the middle portion of the trapezius. Its fibers run horizontally from the spine toward the medial margin of the scapula, so when they contract they pull the scapulaMedially toward the spine, bringing the inner borders closer together. The upper fibers pull the scapula upward and rotate it, aiding in elevation, while the lower fibers pull it downward and assist in upward rotation. So for moving the shoulder blades toward the spine, the middle fibers do the primary work.

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