Vocal Cord Paralysis: Pathophysiology, Etiologies, and Evaluation

Abstract

studies suggesting additional motor contributions from the internal branch of the SLN. The LCA muscle is a strong adductor of the vocal folds. All laryngeal functions requiring glottic closure such as phonation, coughing, straining, and Valsalva's maneuver require a strong contraction of the LCA muscle. Likewise, the PCA muscle is the primary abductor of the vocal folds, with inspiratory vocal fold abduction being the most important function of this muscle. The IA muscle is comprised of three muscles, the transverse arytenoid muscle and two oblique arytenoid muscles.

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