Which movement is associated with the teres major muscle?

The teres major muscle plays a crucial role in upper body movements, particularly those involving the shoulder joint. It primarily functions to adduct, extend, and medially rotate the humerus.

When the teres major contracts, it brings the arm closer to the body (adduction), moves the arm backward (extension), and rotates the arm inward towards the body's midline (medial rotation). This combination of actions is essential during various activities, such as pulling motions or movements where the arm is drawn towards the torso.

The other options present actions that correlate with different muscles or joints. Adducting and extending the knee are primarily performed by muscles such as the hamstrings and the adductor group of the thigh, while flexing and abducting the shoulder is associated more with muscles like the deltoid and pectoralis major. Additionally, external rotation of the humerus is mainly accomplished by muscles such as the infraspinatus and teres minor.