Where does the teres minor muscle insert?

The teres minor muscle is a small muscle located in the shoulder region that plays an essential role in the rotation and stabilization of the shoulder joint. It inserts specifically at the greater tubercle of the humerus. This insertion point allows the muscle to contribute effectively to the external rotation of the arm and assist in other shoulder movements.

The greater tubercle of the humerus serves as a prominent bony landmark where several rotator cuff muscles, including the teres minor, attach. By inserting here, the muscle can effectively stabilize the head of the humerus within the glenoid cavity of the scapula during arm movements, preventing dislocation and enhancing functional mobility.

The other options refer to anatomical landmarks where different muscles attach or structures exist, but they are not relevant to the teres minor. For instance, the styloid process of the radius relates to wrist and forearm muscles, the olecranon process of the ulna relates to elbow functioning and triceps attachment, and the lateral epicondyle of the humerus is associated with muscles that extend the wrist and fingers. Thus, the correct choice highlights the teres minor's role in shoulder mechanics through its specific anatomical insertion point.