Review Question - QID 211325

A 21-year-old infantryman dislocates his shoulder during basic training. He is able to make it through training but continues to experience recurrent dislocations. A CT demonstrates anterior glenoid bone loss and your sports colleagues indicate him for a Latarjet procedure. The procedure successfully restores stability to his shoulder, but the patient is referred to your office just over 3 months later because he has persistent difficulty with abduction when the arm is internally rotated. You suspect an iatrogenic nerve injury sustained during anterior shoulder exposure and offer him a nerve transfer procedure involving the branch of the radial nerve that innervates the medial head of triceps. The nerve that is injured in this patient innervates what muscles?