Pectoralis Minor attaches to the coracoid process of the scapula and to the outer surfaces of the third, fourth and fifth ribs. Restriction here can pull the shoulder blade forward (you will see the bottom/inferior portion of your shoulder blade lift away from your body wall), potentially bringing the entire arm with it).
Pectoralis Major is a big fan shaped muscle that is attached to the chest at the sternum (breast bone) and clavicle (collar bone) . The fan shaped fibers coverge at the arm and attach into the bicipital groove of the humerus. Restriction in this muscle will pull the arm in front of the body and rotate your arm into internal rotation (with your arms at rest at your sides, look in the mirror: where are your elbow creases facing? If they are turned toward your body, that is called internal rotation. In neutral, the arms should rest at the sides of the body with the elbow creases facing forward).