(61) During this procedure, the branches of the recurrent laryngeal nerve innervating the thyroarytenoid (TA) and
lateral cricoarytenoid (LCA) muscles are transected.
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.
* Bilateral transarytenoid and
lateral cricoarytenoid myectomy--This surgery is usually performed one side at a time, at least six months apart.
In addition, botulinum toxin injection into the
lateral cricoarytenoid muscle is helpful in some patients.
The muscular process is the insertion point of the posterior and
lateral cricoarytenoid muscles.
There are four pairs of muscle groups in the larynx: the thyroarytenoid, the
lateral cricoarytenoid, the posterior cricoarytenoid, and the cricothyroid muscles.
High CQ requires increased glottal adduction, which might correspond to stronger contraction of the interarytenoid and
lateral cricoarytenoid muscles, as well as increased medial compression from activity in the thyroarytenoids.
Laryngeal EMG evaluates neuromuscular activity and integrity of the laryngeal muscle adductors (thyroarytenoid and
lateral cricoarytenoid) and abductors (posterior cricoarytenoid).
Likewise,
lateral cricoarytenoid (LCA) and interarytenoid (IA) muscle contraction produces more adduction, but primarily on the upper part of the vocal fold, at the vocal processes.
Botulinum toxin was injected into the right
lateral cricoarytenoid muscle.
[26] The third motor branch innervates the
lateral cricoarytenoid muscle (LCA), passing through it to terminate in the thyroarytenoid muscle (TA).
[7] This is in contrast to other evidence that suggests that fast-twitch fibers in the thyroarytenoid and
lateral cricoarytenoid muscles are reinnervated more rapidly and to a greater degree than slow-twitch fibers.
