An 11-year-old boy falls down the stairs. A physician examines a radiograph of the boy's shoulder region. If the structure indicated by the letter B is fractured, which of the following structures is most likely injured?
(d) Fracture of the surgical neck of the humerus occurs commonly and damages the axillary nerve and the posterior humeral circumflex artery.
Musculocutaneous nerve
Radial nerve
Deep brachial artery
Posterior humeral circumflex artery
Upper Extremity