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Posterior crico-arytenoid

Other Terms: Cricoarytenoid, Crico-arytenoideus posterior, Posterior cricoarytenoid, Posterior cricoarytenoideus, Musculus cricoarytenoideus posterior, Muscle crico-aryténoïdien postérieur

Muscle parts

None

Latin name

Musculus cricoarytenoideus posterior

Latin muscle parts

None

Group

Branchial arch muscle – sixth arch (Laryngeal muscle)

Etymology

In English, this muscle’s name translates as the lateral muscle of the ring and ladle-shapes. Crico comes from the Greek krikos meaning “ring,” which is a reference to the ring-like cricoid cartilage of the larynx. Arytenoid is from the Latin arytaena meaning ladle, or dipper, combined with the Greek ending eidos meaning “shape or form.” Posterior is from the Latin post meaning “behind or after.”

Origin

Posterior surface of the cricoid lamina

Insertion

Posterior surface of the muscular process of the arytenoid cartilage

Action

Open the glottis by rotating the arytenoid cartilages laterally; pull the arytenoid cartilages posteriorly to tighten the vocal folds.

Nerve supply

Vagus nerve (Cranial nerve X)

Blood supply

The laryngeal muscles receive blood from both the subclavian and external carotid arteries. The thyrocervical trunk of the subclavian gives rise to the inferior thyroid, which gives rise to the inferior laryngeal artery. This artery enters the larynx from below. Entering the larynx from above is the superior laryngeal artery, which is a branch of the superior thyroid artery from the external carotid.

Latin

Musculus cricoarytenoideus posterior

French

Muscle crico-aryténoïdien postérieur

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