Quain's elements of anatomy . the lower nearly straight. The flattened external surface ofeach ala is marked by an indistinct oblique line or ridge (fig. 450),which, commencing at a tubercle, situated at the back part of theupper border, passes downwards and forwards to a tubercle below, so asto mark off the anterior three-fourths of the surface from the line gives attachment below to the sterno-thyroid, and above tothe thyro-hyoid muscle, whilst the small smooth surface behind it, givesorigin to part of the inferior constrictor of the pharynx, and afforda CARTILAGES OF THE LAEY
Quain's elements of anatomy . the lower nearly straight. The flattened external surface ofeach ala is marked by an indistinct oblique line or ridge (fig. 450),which, commencing at a tubercle, situated at the back part of theupper border, passes downwards and forwards to a tubercle below, so asto mark off the anterior three-fourths of the surface from the line gives attachment below to the sterno-thyroid, and above tothe thyro-hyoid muscle, whilst the small smooth surface behind it, givesorigin to part of the inferior constrictor of the pharynx, and afforda CARTILAGES OF THE LAEYNX. 523 attachment by means of areolar tissue, to the thyroid body. On theirinternal surfaces, the ala are smooth and slightly concaye. Of the fourcornua, all of which bend inwards, the two superior or great cornua(fio-. 450), pass upwards with sometimes a slight backward curve, andterminate each by a blunt extremity, which is connected, by means of thelateral thyro-hyoid ligament, to the tip of the corresponding great cornu. Fig. 450.—Front tiewof the laryngeal CARTILAGES AND LIGAMENTS (Sappey). 1, hyoid bone ; 2, its large cornua ; 3,its small cornua ; 4, tliyi-oid carti-lage ; 5, tliyro-hyoid membrane ; 6,lateral thyro-hyoid ligament, containingthe cartilago triticea, 7 ; 8, cricoidcartilage ; 9, crico-thyroid membrane;10, lateral crico-thyi-oid ligaments. of the hyoid bone (fig. 450, 2).The inferior or smaller cornua,which are somewhat thicker butshorter, are directed slightly for-wards, and, on the inner aspect ofthe tip, present a smooth surface,for articulation with a prominenceon the side of the cricoid carti-lage. The cricoid cartilage (,8), which is shaped like a sig-net ring, is thicker and strongerthan the thyroid. It is deepbehind (fig. 451, 2), where it isexpanded into a squarish plate orlamina, measuring in the male about an inch from above down-wards ; but in front it forms a narrow ring or arch, with a verticalmeasurement of only one-fomth or one-fifth
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
