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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
