Teres Major is a muscle located in the upper arm and shoulder area. It is also known as the "latissimus dorsi of the arm" due to its similar function to the latissimus dorsi muscle. Other common synonyms for Teres Major include the "inferior subscapular muscle," the "lower subscapular muscle," and the "large round muscle of the shoulder." The muscle is responsible for a variety of movements, including rotation, extension, and adduction of the arm. It is a crucial part of the musculoskeletal system and is commonly targeted through exercises designed to strengthen and condition the upper body.