A 20-Year-Old Man Is Evaluated Due to Weakness in the Left

A 20-year-old man is evaluated due to weakness in the left hand. The patient has a motor vehicle collision, where he injured his left arm. Since that day, he has been complaining of numbness in the left hand and weakness. On examination, there is a loss of sensation over the 5th digit and hypothenar muscles atrophy. Triceps reflexes are 2+ and symmetric bilaterally. This patient's nerve injury is most likely at which of the following levels?

A) Carpal tunnel
B) Coracobrachialis muscle
C) Head of the radius
D) Hook of the hamate
E) Midshaft of the humerus
F) Surgical neck of the humerus

Correct Answer:

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