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Lateral crico-arytenoid

Other Terms: Cricoarytenoid, Crico-arytenoideus lateralis, Lateral cricoarytenoid, Lateral cricoarytenoideus, Musculus cricoarytenoideus lateralis, Muscle crico-aryténoïdien latéral

Muscle parts

None

Latin name

Musculus cricoarytenoideus lateralis

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.” Lateral is from the Latin latus meaning “side.”

Origin

Upper anterior aspect of the arch of the cricoid cartilage

Insertion

Anterior surface of the muscular process of the arytenoid cartilage

Action

Rotate the arytenoid cartilages medial to close the glottis.

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 lateralis

French

Muscle crico-aryténoïdien latéral

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