Arytenoid cartilage

Arytenoid cartilage
Arytenoid cartilage
Gray950.png
The cartilages of the larynx. Posterior view.
Latin cartilagines arytenoidea
Gray's subject #236 1075
Precursor 4th and 6th branchial arch
MeSH Arytenoid+Cartilage

The arytenoid[1] cartilages are a pair of small three-sided pyramids which form part of the larynx, to which the vocal folds (vocal cords) are attached. These allow and aid in the vocal cords' movement.

Each is pyramidal in form, and has three surfaces, a base, and an apex.

Contents

Surfaces

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.

Base and apex

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 called the muscular process

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

Function

They allow the vocal folds 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.

Additional images

Notes

  1. ^ From Ancient Greek: ἀρύταινα, arytaina, "ladle."

External links


This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.


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Look at other dictionaries:

  • arytenoid cartilage — noun either of two small cartilages at the back of the larynx to which the vocal folds are attached • Syn: ↑arytenoid, ↑arytaenoid • Hypernyms: ↑cartilage, ↑gristle • Part Holonyms: ↑larynx, ↑voice box …   Useful english dictionary

  • arytenoid cartilage — either of the two pyramid shaped cartilages that lie at the back of the larynx next to the upper edges of the cricoid cartilage. * * * cartilago arytenoidea …   Medical dictionary

  • arytenoid cartilage — either of the two pyramid shaped cartilages that lie at the back of the larynx next to the upper edges of the cricoid cartilage …   The new mediacal dictionary

  • Muscular process of arytenoid cartilage — The cartilages of the larynx. Posterior view. Latin processus muscularis cartilaginis arytenoideae Gray s …   Wikipedia

  • colliculus of arytenoid cartilage — colliculus cartilaginis arytenoideae [TA] a small eminence on the anterior margin and anterolateral surface of the arytenoid cartilage …   Medical dictionary

  • Arytenoid muscle — Muscles of larynx. Posterior view. Oblique arytenoid: The X in the center. Transverse arytenoid: Bands underneath the X . Aryepiglotticus: Wraps around back …   Wikipedia

  • Arytenoid — can refer to: Arytenoid cartilage Arytenoid muscle This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to …   Wikipedia

  • arytenoid — [ar΄ə tē′noid, ə rit′ n oid΄] adj. [Gr arytainoeidēs, ladle shaped < arytaina, a ladle, cup < aryein, to draw (water) + eidos, form: see OID] 1. designating or of either of two small cartilages at the back of the larynx, connected with the… …   English World dictionary

  • arytenoid — Denoting a cartilage (a. cartilage) and muscles (oblique and transverse a. muscles) of the larynx. [see arytenoideus] * * * ary·te·noid .ar ə tē .nȯid, ə rit ən .ȯid adj 1) relating to or being either of two small cartilages to which the vocal… …   Medical dictionary

  • arytenoid — adj. pertaining to two small cartilages located on top of the cricoid cartilage in the larynx; of or pertaining to the glands or muscles attached to the two arytenoid cartilages in the larynx (Anatomy) n. (Anatomy) either of two small funnel… …   English contemporary dictionary

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