Posterior Cricoarytenoid Only Abductor — FRCA Primary MCQ
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Correct answer: A — Posterior cricoarytenoid
The posterior cricoarytenoid is the only vocal cord abductor. All others are adductors or tensors. Bilateral RLN palsy causes adduction (complete obstruction) because adductors are more powerful. Unilateral palsy causes paramedian positioning with hoarseness.
Reference: RCoA 2021 Primary FRCA Curriculum