Pectoralis Major: Origin, Insertion, Nerve, Action & "The Chest Muscle"

The Pectoralis Major is a large, fan-shaped muscle that covers the upper chest. It is the most superficial muscle in the pectoral region and forms the bulk of the chest wall. It is a powerful adductor and internal rotator of the arm, essential for pushing, hugging, and throwing motions.

[Image of Pectoralis Major muscle anatomy]