A 10-year-old boy is brought to the emergency department after falling down from a tree. An X-ray was taken immediately which showed he had a midshaft fracture of the humerus. Which of the following structures is most likely to be injured with this type of fracture?
(A) Anterior circumflex humeral artery
(B) Axillary nerve
(C) Median nerve
(D) Radial nerve
(E) Ulnar nerve
The correct answer is D. A midshaft fracture of the humerus could cause injury to the structures found in the radial groove: the radial nerve and the deep brachial artery.