1) Laryngeal electromyography must show increased muscle discharge of the thyroarytenoid or posterior cricoarytenoid muscles
at the affected pitch(es).
There even exists a "NG tube syndrome" (5), the pathophysiological mechanism of which is thought to be paresis of the posterior cricoarytenoid muscles
secondary to ulceration and infection over the posterior lamina of the cricoid.
75 units of Botox, into the cricoarytenoid muscles
, and she began speaking in a normal voice (which lasted about six months) after a breathy period of about three weeks.
The muscular process is the insertion point of the posterior and lateral cricoarytenoid muscles.
13) As has been shown in glycogen depletion studies, diffusion of botulinum toxin from an injected thyroarytenoid muscle into the adjacent lateral cricoarytenoid muscle may also contribute to the arrest of adduction.
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).
These researchers suggested, "the cricothyroid muscle regulates a steady pitch level, and that the vocalis and lateral cricoarytenoid muscles
modulate this pitch level and add changes to the perceived tone quality.
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.
If the injury to the nerve occurs at the level of the thyroarytenoid or lateral cricoarytenoid muscles
, there will be isolated abnormalities in vocal fold adduction.
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.