The teres major is a thick, ovoid muscle of the upper limb that plays a crucial role in the movement and stabilization of the shoulder joint. It works in conjunction with the latissimus dorsi to medially rotate and adduct the humerus, contributing to the arm's ability to perform actions such as pulling or lifting objects towards the body.

Teres Major

Upper limb

The shoulder joint, also known as the glenohumeral joint, is a ball-and-socket joint that allows for a wide range of motion but is inherently less stable compared to other joints. Its stability is primarily maintained by a combination of muscles, tendons, and ligaments, making it susceptible to injuries such as dislocations and rotator cuff tears.

Shoulder Joint

The latissimus dorsi is a large, flat muscle on the back that plays a critical role in shoulder and arm movement, as well as maintaining proper posture. It is essential for actions such as pulling, lifting, and rotating the arms, making it a key muscle in both everyday activities and athletic performance.

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