Review Question - QID 220091

A 32-year-old bodybuilder attempts to break a personal record in the weight room. After a light warm-up, he begins to bench press. During the eccentric phase of the bench press, he feels a sharp pop and tearing sensation in his right shoulder, followed by a loss of strength. He presents to the ER with significant swelling and ecchymosis to his anterolateral chest wall and a "dropped nipple" sign on the right side. An MRI is obtained, and it is determined that the patient tore only a portion of the pectoralis major. Which letter or letters in Figure 1 correctly identify the innervation of the most commonly torn portion of the pectoralis major?