Thyroarytenoid Muscle, Superior View

Description

Oriented from a superior perspective over the laryngeal inlet, the paired thyroarytenoid muscles (including the medial vocalis fibers) occupy the lateral margins of the rima glottidis, running anteroposteriorly from the inner surface of the thyroid cartilage toward the vocal process of the arytenoid cartilage. Medial to each thyroarytenoid lies the vocal ligament, while the more lateral paraglottic space separates it from the inner aspect of the thyroid lamina. Posteriorly, the muscular belly abuts the arytenoid complex, and superiorly it relates to the laryngeal ventricle and vestibular (false) fold, clarifying how bulk in this compartment shapes the true vocal fold contour. The male configuration is consistent with a larger laryngeal framework and thicker fold profile. Clinically, this view matters because the thyroarytenoid is the primary “body” of the vocal fold and a key determinant of phonatory tension and glottic closure, the same mechanics targeted in voice therapy and in phonosurgery. Denervation from recurrent laryngeal nerve palsy leaves the ipsilateral thyroarytenoid hypotonic, producing a breathy voice from incomplete adduction, while hyperfunctional dysphonia can present with excessive medial compression and thickened fold appearance. For laryngologists, the relationship between the thyroarytenoid, vocal ligament, and arytenoid vocal process also frames the logic of injection laryngoplasty and medialization thyroplasty when restoring glottic competence. Use this asset in head and neck anatomy teaching, speech-language pathology coursework on phonation, or operative atlases and patient-facing materials that explain vocal fold paralysis, presbyphonia, or medialization procedures with an anatomically correct superior laryngeal orientation. It also reads well alongside endoscopic laryngoscopy images when correlating surface findings with intrinsic laryngeal muscle anatomy. Anatomical accuracy verified by SciePro's Medical Advisory Board.