Arytenoid cartilage

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Arytenoid cartilage

The cartilages of the larynx. Posterior view.
Latin	cartilagines arytænoideæ
Gray's	subject #236 1075
MeSH	A02.165.507.083

The arytenoid cartilages are three-sided pyramids which form part of the larynx and allow the vocal cords to be tensed, relaxed, or approximated.

The arytenoids articulate with the supero-lateral parts of the cricoid cartilage lamina, forming the cricoarytenoid joints at which they can come together, move apart, tilt anteriorly or posteriorly, and rotate. They have two processes: a thin anterior vocal process to which the vocal ligament attaches and a wider posterior muscular process to which the posterior and lateral cricoarytenoid muscles are attached. The muscular process acts therefore as a sort of lever under the influence of the two muscles. In addition, the point or apex of the pyramid carries the corniculate cartilage to which the aryepiglottic fold attaches.

[edit] Details from Gray's anatomy

The arytenoid cartilages are a pair of small pyramid-shaped cartilages, at the upper rear of the larynx, to which the vocal cords are attached.

The Arytenoid Cartilages are two in number, and situated at the upper border of the lamina of the cricoid cartilage, at the back of the larynx. Each is pyramidal in form, and has three surfaces, a base, and an apex.

The posterior surface is a triangular, smooth, concave, and gives attachment to the Arytænoidei obliquus and transversus.

The antero-lateral surface is somewhat convex and rough. On it, near the apex of the cartilage, is a rounded elevation (colliculus) from which a ridge (crista arcuata) curves at first backward and then downward and forward to the vocal process. The lower part of this crest intervenes between two depressions or foveæ, an upper, triangular, and a lower oblong in shape; the latter gives attachment to the Vocalis muscle.

The medial surface is narrow, smooth, and flattened, covered by mucous membrane, and forms the lateral boundary of the intercartilaginous part of the rima glottidis.

The base of each cartilage is broad, and on it is a concave smooth surface, for articulation with the cricoid cartilage. Its lateral angle is short, rounded, and prominent; it projects backward and lateralward, and is termed the muscular process; it gives insertion to the Cricoarytænoideus posterior behind, and to the Cricoarytænoideus lateralis in front. Its anterior angle, also prominent, but more pointed, projects horizontally forward; it gives attachment to the vocal ligament, and is called the vocal process.

The apex of each cartilage is pointed, curved backward and medialward, and surmounted by a small conical, cartilaginous nodule, the corniculate cartilage.

[edit] External links

Diagram

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.