A 38-Year-Old Man Is Evaluated for Tingling and Numbness in the Left

A 38-year-old man is evaluated for tingling and numbness in the left hand. The patient has been complaining of pain for the past two months, especially at work times. He works as a car mechanic. Physical examination shows decreased sensation in the palmar side of the lateral 3 and a half digits of the left hand, thenar eminence, and the lateral palm. This patient most likely has an injury in the course of the nerve between which of the following structures?

A) Biceps and coracobrachialis muscles
B) Flexor carpi ulnaris and flexor digitorum profundus muscles
C) Humeral and ulnar heads of the pronator teres muscle
D) Olecranon and the medial epicondyle of the humerus
E) Supinator muscle and the head of the radius

Correct Answer:

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