A 40-year-old male sustains a displaced mid-shaft humeral fracture from a fall off a horse. On examination, he has wrist drop (inability to extend the wrist and fingers) and sensory loss over the first dorsal web space. What nerve has been injured?ARadial nerve - it runs in the spiral groove of the humerus and is the most commonly injured nerve in mid-shaft humeral fractures; wrist drop and first dorsal web space sensory loss are pathognomonicBMusculocutaneous nerve - causing weakness of elbow flexionCAxillary nerve - causing deltoid weaknessDUlnar nerve - causing wrist dropEMedian nerve - causing inability to extend the wristCheck my answer