Head & Neck · NEET PG Preparation Anatomy
A deep stab wound to the posterior triangle of the neck results in the inability to shrug the shoulder and an inability to abduct the arm above 90 de…
Practice question from Head & Neck (NEET PG Preparation Anatomy), with the correct answer and a step-by-step solution.
easy · MCQ · Q-700AEF
A deep stab wound to the posterior triangle of the neck results in the inability to shrug the shoulder and an inability to abduct the arm above 90 degrees. Which nerve is most likely injured?
- A.Accessory nerve (CN XI)Correct answer
- B.Dorsal scapular nerve
- C.Long thoracic nerve
- D.Suprascapular nerve
Solution
The spinal accessory nerve (CN XI) runs superficially across the posterior triangle of the neck deep to the investing layer of deep cervical fascia, making it vulnerable to lacerations. It supplies the sternocleidomastoid and trapezius muscles. Injury to the trapezius causes drooping of the shoulder and inability to abduct the arm past 90 degrees.
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