The thyroarytenoid contains the vocalis (thyrovocalis) as its medial portion. The muscle that forms the body of the vocal fold. The lateral portion (thyromuscularis) adducts and stabilises the arytenoid. Botulinum injection of the thyroarytenoid is the primary treatment for adductor spasmodic dysphonia.
An expanded entry for Thyroarytenoid.
| Origin | Inner surface of the thyroid cartilage angle, lower half |
|---|---|
| Insertion | Muscular process of the arytenoid cartilage and vocal process |
| Nerve Supply | Recurrent laryngeal nerve (RLN, branch of CN X) |
| Blood Supply | Laryngeal branch of inferior thyroid artery |
| Actions |
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|---|
It shortens and relaxes the vocal cords to lower pitch and helps close the glottis during swallowing.
Thyroarytenoid botulinum injection for adductor spasmodic dysphonia produces 3-4 months of relief from the strained, strangled voice characteristic of this condition. The injection is guided by EMG through the cricothyroid membrane. RLN injury during thyroidectomy denervates the thyroarytenoid, producing vocal fold paralysis.
Not externally palpable, assessed by laryngoscopy showing vocal fold motion and botulinum response.
EMG-guided thyroarytenoid botulinum injection producing 3-4 months of improved voice quality in adductor spasmodic dysphonia.
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