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12693 Anatomy

During a fight in a tavern, a 45-year-old male construction worker received a shallow stab wound from a broken beer bottle at a point near the middle of the left posterior triangle of his neck. Upon physical examination it is observed that the left shoulder is drooping lower than the right shoulder, and the superior angle of the scapula juts out slightly. Strength in turning the head to the right or left appears to be symmetric. Which of the following nerves is most likely injured?

ASuprascapular nerve in the supraspinous fossa
BThe terminal segment of the dorsal scapular nerve
CThe upper trunk of the brachial plexus
DThe spinal accessory nerve in the posterior cervical triangle
Anatomy
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