Musculus teres major is a muscle found in the upper arm close to the shoulder joint. It is also known by the synonyms latissimus dorsi pars spinalis, teres major muscle, and major teres muscle. The muscle is important for shoulder movement and contributes to the flexion, extension, and internal rotation of the humerus bone. Additionally, it provides joint stability and strength, making it essential for various athletic and functional movements. Injuries to the muscle can result in weakness or pain in the shoulder, impacting overall mobility and performance. Understanding the synonyms for musculus teres major is valuable for medical professionals, athletes, and individuals looking to improve their shoulder health.