. The anatomy of the domestic animals. Veterinary anatomy. CARTILAGES OF THE LARYNX 515 Cartilages of the Larynx There are three single cartilages and one pair; the single cartilages are the cricoid, tliyroid, and epiglottic; the arytenoid cartilages are paired. The cricoid CJirtilage (Cartilago cricoidea) is shaped like a signet ring. The dorsal part is a broad, thick, quadrilateral plate termed the lamina; the external (dorsal) surface of this is marked by a median ridge (Crista mediana) separating two shallow cavities, from which the dorsal crico-arytenoid muscles arise. On either side of t
. The anatomy of the domestic animals. Veterinary anatomy. CARTILAGES OF THE LARYNX 515 Cartilages of the Larynx There are three single cartilages and one pair; the single cartilages are the cricoid, tliyroid, and epiglottic; the arytenoid cartilages are paired. The cricoid CJirtilage (Cartilago cricoidea) is shaped like a signet ring. The dorsal part is a broad, thick, quadrilateral plate termed the lamina; the external (dorsal) surface of this is marked by a median ridge (Crista mediana) separating two shallow cavities, from which the dorsal crico-arytenoid muscles arise. On either side of these depressions are two articular facets. The anterior facet (Facies articu- laris ar\i;£enoidea) is at the anterior border, is oval and convex, and articulates with the arytenoid cartilage. The posterior facet (Facies articularis thyreoidea) is situated on the front of a ridge, a short distance from the posterior border; it is concave, and articulates with the posterior cornu of the thyroid cartilage. The ventral and lateral parts of the ring are formed by a curved band, called the arch (Arcus), which is narrowest ventrally. The lateral surfaces of the arch are grooved Muscular process Apex. Crico-thyroiil membrane Laryngeal prominence Fig. 457.—Laryngeal Cartilages and Part of Trachea of Horse; Right Vi For "thyroid wing" read "thyroid ; for the crico-thyroid muscle. The anterior border of the lamina is thick and slightly concave; the posterior border is thin and irregular. The anterior border of the arch is concave ventrally and gives attachment to the membrane; laterally it is thicker and gives attachment to the crico-arytenoideus lateralis muscle. The posterior border of the cartilage is attached to the first ring of the trachea by the crico-tracheal membrane. The internal surface is smooth and is covered with mucous membrane. The thyroid cartilage (Cartilago thyreoidea) consists of a median thickened portion, termed the bodj',
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