A fracture of the medial epicondyle of the humerus injures a nerve at the cubital tunnel. Which muscle is tested to confirm this injury?

• A Flexor carpi radialis
• B Brachioradialis
• C Extensor digitorum communis
• D First dorsal interosseous ✓

Explanation

The ulnar nerve runs posterior to the medial epicondyle and is vulnerable to fractures or dislocations at this site. It supplies most intrinsic hand muscles including all interossei, hypothenar muscles, medial two lumbricals, and adductor pollicis. The first dorsal interosseous (index finger abduction) is a reliable and easily tested ulnar-innervated muscle. Flexor carpi radialis is median-innervated, and brachioradialis is radial-innervated.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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