رجل عمره ٤٠ سنة كسر عظم العضد في منتصفه، ولا يستطيع رفع رسغه للأعلى (تدلي الرسغ)، مع خدر في ظهر اليد. ما العصب المصاب؟

A 40-year-old fractured the middle of his humerus and cannot lift his wrist (wrist drop), with numbness on the back of the hand. Which nerve is injured?

1. Radial nerve
2. Median nerve
3. Axillary nerve
4. Ulnar nerve

Answer: A) Radial nerve. Mid-shaft humeral fractures can injure the radial nerve in its groove, causing wrist drop and dorsal hand numbness; this is documented and followed.