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Arytenoid cartilage

From Wikipedia, the free encyclopedia

Arytenoid cartilage
Gray950.png
The cartilages of the larynx seen from behind
Details
Precursor4th and 6th pharyngeal arch
Identifiers
LatinCartilagines arytaenoideae
MeSHD001193
TAA06.2.04.001
FMA55109
Anatomical terminology

The arytenoid (/ærɪˈtnɔɪd/)[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 or ladle-shaped in form (arytenoid comes from Ancient Greek ἀρύταινα arytaina meaning "ladle" and εἶδος eidos, meaning "form"),[2] and has three surfaces, a base, and an apex.

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Transcription

Contents

Structure

Surfaces

The posterior surface is triangular, smooth, concave, and gives attachment to the arytenoid muscle 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.

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

References

  1. ^ Murry, James A. H. (1888). A New English Dictionary on a Historical Basis. Oxford: Clarendon Press. p. 477.
  2. ^ Farlex dictionary: arytenoid cartilage Citing: Mosby's Medical Dictionary, 8th edition.
This page was last edited on 22 December 2019, at 06:42
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