The muscle that assists the pectoralis major in adducting and medially rotating the shoulder, but extends rather than flexes the joint, is the ________.

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The latissimus dorsi is a large muscle in the back that assists the pectoralis major in adducting and medially rotating the shoulder. However, unlike the pectoralis major, the latissimus dorsi extends the shoulder joint rather than flexing it. The other muscles listed - trapezius, supraspinatus, rhomboid major, and serratus anterior - do not directly assist the pectoralis major in adduction and medial rotation of the shoulder joint.

The Muscle That Assists the Pectoralis Major in Adducting and Medially