posterior cricoarytenoid muscle

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Also found in: Acronyms.

pos·ter·i·or cri·co·ar·y·te·noid mus·cle

(pos-tēr'ē-ŏr krī'kō-ar-i-tē'noyd mŭs'ĕl)
Intrinsic muscle of larynx; origin, depression on posterior surface of lamina of cricoid; insertion, muscular process of arytenoid; action, abducts vocal folds, widening rima glottidis during deep inhalation; nerve supply, recurrent laryngeal.
Synonym(s): musculus cricoarytenoideus posterior.
References in periodicals archive ?
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.
Additionally, the epiglottis-posterior hypopharyngeal wall distance was narrowed, and the inferior constructor muscle and posterior cricoarytenoid muscle were compressed due to osteophytes on the left side.
Endoscopic arytenoid reduction was performed along with chemical tenotomy of the posterior cricoarytenoid using 10 units of botulinum toxin.
The cricoarytenoid joint is a synovial joint enclosed by a capsule that receives posterior support from the posterior cricoarytenoid ligament.
pressed" is maintained through the adductors, that is, the lateral cricoarytenoid (LCA) and interarytenoid (IA) muscles, and their antagonist, the posterior cricoarytenoid (PCA) muscle, which is an abductor (see Figure 1c).
Thus, the adductory and abductory muscles, namely the lateral cricoarytenoid, the interarytenoid, the posterior cricoarytenoid (and to some degree the thyroarytenoid muscles) get plenty of short burst activity.

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