Final answer:
The latissimus dorsi is an axial muscle that helps move the humerus at the shoulder joint, working with other muscles in pairs to allow for controlled arm movement.
Step-by-step explanation:
The latissimus dorsi is one of the muscles that moves the humerus, located on the inferior part of the back. It is an axial muscle that, along with others such as the pectoralis major, enables the movement of the arm at the shoulder joint. Together with muscles such as the biceps brachii and brachialis, they work synergistically to produce motion. The latissimus dorsi inserts into the humerus via an aponeurosis, facilitating actions such as extension, adduction, and internal rotation of the arm. As muscles typically operate in pairs, the actions of the latissimus dorsi are complemented by other muscles to allow for controlled movement of the arm.