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The Cricoid Cartilage - the common comparison made between...

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The Cricoid Cartilage The cricoid cartilage or simply cricoidis the only complete ring of cartilage around the trachea is the only complete ring of cartilage around the trachea. It sits just inferior to the thyroid cartilage in the neck, and is joined to it medially by the median cricothyroid ligament and postero-laterally by the cricothyroid joints. Inferior to it are the rings of cartilage around the trachea. The cricoid is joined to the first tracheal ring by the cricotracheal ligament, and this can be felt as a more yielding area between the firm thyroid cartilage and firmer cricoid. It is also anatomically related to the thyroid gland; although the thyroid isthmus is inferior to it, the two lobes of the thyroid extend superiorly on each side of the cricoid as far as the thyroid cartilage above it. The posterior part of the cricoid is slightly broader than the anterior and lateral parts, and is called the lamina, while the anterior part is the band; this may be the reason for
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Unformatted text preview: the common comparison made between the cricoid and a signet ring. The Arytenoid Cartilage The arytenoid cartilages are a pair of small three-sided pyramids which form part of the larynx, to which the vocal cords are attached. 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 Arytenoid muscles. The anterolateral 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 fovea, an upper, triangular, and a lower oblong in shape; the latter gives attachment to the Vocal muscles. 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....
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