A 24-Year-Old Man Is Brought to the Emergency Department Due

A 24-year-old man is brought to the emergency department due to right arm pain after a fall.  While rock climbing at a nearby national park, the patient lost his grip and fell approximately 3 m (10 ft) onto the boulders below.  He says, "I landed on my right arm and heard something snap."  The patient did not strike his head or lose consciousness.  He has no chronic medical conditions and takes no daily medications.  Vital signs are within normal limits.  Physical examination shows extensive bruising over the lateral right arm and a total inability to extend the right wrist.  X-ray reveals a midshaft fracture of the right humerus.  Which of the following arteries is most likely to be injured in this patient?

A) Brachial artery
B) Common interosseous artery
C) Deep brachial artery
D) Posterior circumflex humeral artery
E) Radial collateral artery

Correct Answer:

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