Ring-shaped cartilage
Cricoid cartilago , cartilago cricoidea, - unpaired cartilage of larynx, has the appearance of a ring. The enlarged part of the cartilage is a plate of the cricoid cartilage, lamina cartilaginis cricoideae, is facing posteriorly, and the narrowed part of the cartilage is the arc of the cricoid cartilage, arcus cartilaginis cricoideae, facing anteriorly. The lower edge of the cricoid cartilage, directed towards the first tracheal cartilage, is located horizontally.
The upper edge of the cricoid cartilage is parallel to the lower edge only in the anterior semicircle, posteriorly it ascends obliquely, limiting the plate.
On the upper edge of the plate of the cricoid cartilage, on each side of the median line, on each side is the arytenoid articular surface, facies articularis arytenoidea, - the junction with the base of the arytenoid cartilage. The posterior surface of the plate has a vertically extending middle crest, with dimples on the sides of the plate.
On each lateral surface of the cricoid cartilage there is a rounded form of the thyroid articular surface, facies articularis thyroidea, the place of articulation with the lower horn of the thyroid cartilage.
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