ANATOMY

Detailed explanation-1: -The pectoralis major is the superior most and largest muscle of the anterior chest wall. It is a thick, fan-shaped muscle that lies underneath the breast tissue and forms the anterior wall of the axilla.

Detailed explanation-2: -The pectoralis major extends across the upper part of the chest and is attached to a ridge at the rear of the humerus (the bone of the upper arm). Its major actions are adduction, or depression, of the arm (in opposition to the action of the deltoideus muscle) and rotation of the arm forward about the axis of the body.

Detailed explanation-3: -The pectoralis major (from Latin pectus ‘breast’) is a thick, fan-shaped or triangular convergent muscle of the human chest. It makes up the bulk of the chest muscles and lies under the breast.

Detailed explanation-4: -The first sensation felt when the pectoralis major muscle is torn is sudden pain. This pain is usually felt at the front of the armpit and is sometimes felt across the chest. At the same time you may also feel something ‘tearing’ in your chest. In minor tears you may be able to continue participating with slight pain.

Detailed explanation-5: -The pectoralis major tendon is most commonly injured during an eccentric contraction – when the external force on the muscle is greater than the force that the muscle can generate – and when the arm is extended and externally (outwardly) rotated, such as when performing a bench press.