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Thyro-arytenoid

Other Terms: Thyro-arytenoideus, Thyroarytenoid, Musculus thyroarytenoideus, Muscle thyro-aryténoïdien

Muscle parts

Thyro-epiglottic part

Latin name

Musculus thyroarytenoideus

Latin muscle parts

Pars thyroepiglottica

Group

Branchial arch muscle – sixth arch (Laryngeal muscle)

Etymology

In English, this muscle’s name is the muscle of the shield-like cartilage and the ladle shaped cartilage. The term thyro is from the Greek term thyreos for “shield.” The Greek word thyreos comes from thyra meaning door and referred to a large, oblong stone that was used as a door. The term thyreos was later used to refer to large oblong shields used by Minoan warriors. The shields covered them from shoulders to feet, with the top of the shield having a notch for the chin. It was this shield that the ancient anatomist Galen envisioned when he named the laryngeal cartilage in the 2nd Century. The term arytenoideus comes from the Greek arytaina meaning ladle or dipper, because of the fancied resemblance of this cartilage to a ladle.

Origin

Internal surface of the lower part of the angle of the thyroid cartilage and the cricothyroid ligament

Insertion

Lateral surface of the anterior part of the arytenoid cartilage

Action

Pull the arytenoid cartilages anteriorly and medially to relax the vocal ligaments narrow 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 thyroarytenoideus

French

Muscle thyro-aryténoïdien

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