A 25-Year-Old Man Fractures His Right Tibia in a Motor

A 25-year-old man fractures his right tibia in a motor vehicle accident.  His right leg is fixed in a cast and he requires underarm crutches to ambulate.  Two weeks later, he comes to the clinic with right upper-extremity weakness and numbness.  He has no neck or arm pain.  The patient is concerned because he is right handed and cannot perform his duties as an electrician.  On neurologic examination, there is diminished strength on extension of the right wrist with an absent triceps reflex.  Injury to which of the following nerves is most likely responsible for this patient's symptoms?

A) Accessory
B) Axillary
C) Long thoracic
D) Median
E) Radial
F) Suprascapular

Correct Answer:

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