A 35-Year-Old, Right-Handed Mechanic Comes to the Clinic Due to Progressive

A 35-year-old, right-handed mechanic comes to the clinic due to progressive right hand weakness.  The patient frequently uses a screwdriver at work.  Neurologic examination shows preserved sensation in the upper limbs.  There is weakness on extension of the fingers and thumb in the right hand.  Strength is otherwise intact.  Triceps reflexes are 2+ and bilaterally symmetric.  The nerve affected in this patient was most likely injured at which of the following locations?

A) Axilla
B) Carpal tunnel
C) Coracobrachialis
D) Hook of hamate
E) Midshaft of the humerus
F) Supinator muscle

Correct Answer:

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