overactivation of the thyroarytenoid
muscle) into the note.
Changes in the thyroarytenoid
muscle with aging consist of a loss in muscle mass, a change in innervation, reduced blood flow, and metabolic and hormonal changes.
Such findings are consistent with a research which showed that training through phonation into a tube promotes activation of the thyroarytenoid
, cricothyroid and lateral cricoarytenoid muscles 14.
This may have been due to the effects of SES on the thyroarytenoid
muscle via the stimulation of the ISLN, lowering the frequency of voice.
5-4 units) was injected into Thyroarytenoid
muscle bilaterally under EMG guidance.
The effective medial excursion magnitude of vocal fold produced by the three adductors physiologically is sequentially as following: Rotation effect by lateral cricoarytenoid (LCA), mass or volume effect by thyroarytenoid
(TA) and then shift effect by interarytenoid (IA) muscle.
Hussain and Shakeel (2010) conducted a study in Scotland on selective lateral laser thyroarytenoid
myotomy for adductor spasmodic dysphonia.
Gliding to a lower pitch encourages contraction of the thyroarytenoid
myectomy: an animal study investigating a proposed new treatment for adductor spasmodic dysphonia.
Considering such similarity in the data referring to fiber typification, it is believed that the muscle fibers present in the vestibular fold originate from muscle fascicles belonging to the thyroarytenoid
The muscles most involved in laryngospasm are the lateral cricoarytenoid and the thyroarytenoid
(adductors of the glottis) and the cricothyroid (a tensor of the vocal cords) (9).
6,9,12,13) A typical finding is symmetric high uptake at the muscle origin and insertion of the arytenoid cartilage, posterior cricoarytenoid muscles, and some less intense uptake along the course of thyroarytenoid
and vocalis muscle (11) (Figure 1).