A 22-year-old male is brought to the emergency department af…

A 22-yeаr-оld mаle is brоught tо the emergency depаrtment after falling onto his outstretched arm during a basketball game. He has severe shoulder pain and holds his right arm slightly abducted and externally rotated. The shoulder has a flattened contour, and he is unable to move the arm normally. Radiographs confirm an anterior dislocation of the humeral head. Which nerve is most likely to be injured in this patient?