Which muscle is considered the largest muscle of the chest?

The largest muscle of the chest is the pectoralis major. This muscle has a broad origin from the clavicle, sternum, and the cartilage of the first six ribs, allowing it to cover a significant area of the upper chest. It plays a crucial role in movements of the shoulder joint, including flexion, adduction, and internal rotation of the arm. The size and strength of the pectoralis major make it essential for various pushing movements, such as bench pressing and push-ups. Its significance in upper body strength training is why it is often a focal point in resistance training programs.

The trapezius, while a large muscle in the upper back and neck area, does not belong to the chest. The pectoralis minor, which is located underneath the pectoralis major, is smaller and contributes to movements of the shoulder girdle rather than being a primary muscle of the chest. The serratus anterior, also not a chest muscle but involved with the movement of the scapula, is much smaller in comparison and plays different functional roles in upper body movement.