Upper Limb · NEET PG Preparation Anatomy
During a motorcycle accident, a 24-year-old man suffers a severe traction injury to his right upper limb caused by extreme downward displacement of t…
Practice question from Upper Limb (NEET PG Preparation Anatomy), with the correct answer and a step-by-step solution.
easy · MCQ · Q-4FAD57
During a motorcycle accident, a 24-year-old man suffers a severe traction injury to his right upper limb caused by extreme downward displacement of the shoulder. He presents with the arm hanging loosely by the side, medially rotated, and pronated, assuming the 'waiter's tip' position. Which roots of the brachial plexus are primarily involved?
- A.C8 and T1
- B.C5 and C6Correct answer
- C.C7 only
- D.C5, C6, C7, C8, and T1
Solution
Erb's palsy (waiter's tip hand) results from an upper trunk injury (C5, C6 roots) of the brachial plexus, typically caused by excessive lateral flexion of the neck away from the shoulder. Affected muscles include the biceps brachii, brachialis, deltoid, supraspinatus, infraspinatus, and brachioradialis.
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