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cricothyroid muscle


Definition: intrinsic laryngeal muscle; origin, anterior surface of arch of cricoid; insertion, the anterior or straight part passes upward to ala of thyroid; the posterior or oblique part passes more outward to inferior horn of thyroid; action, acts at cricothyroid joint, pulling anterior aspects of thyroid and cricoid cartilages together, rotating the superior portion of the cricoid lamina and arytenoid cartilages posteriorly, causing vocal folds to tense, increasing the pitch of voice tone; the antagonist of this movement is the thyroarytenoid muscle; nerve supply, external laryngeal branch of superior laryngeal nerve (from vagus).

Synonym(s): musculus cricothyroideusTA

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.