. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NORMAL ANATOMY OF THE LARYNX. 101 number,* of which three are single and un- symmetrical, the epiglottis, thyroid, and cri- coid; two are placed laterally, and form a pair, called the arytenoids. Upon the summits of these are found two minute cartilaginous bodies, termed cornicula; the remaining two (which, however, are not always present) are situated anterior to the arytenoids, and in- volved in the aryteno-epiglottic folds, named the cuneiform cartilages. The cricoid cartilage. Gr. x^ixo?, a ring, £»&>?; Lat. C
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NORMAL ANATOMY OF THE LARYNX. 101 number,* of which three are single and un- symmetrical, the epiglottis, thyroid, and cri- coid; two are placed laterally, and form a pair, called the arytenoids. Upon the summits of these are found two minute cartilaginous bodies, termed cornicula; the remaining two (which, however, are not always present) are situated anterior to the arytenoids, and in- volved in the aryteno-epiglottic folds, named the cuneiform cartilages. The cricoid cartilage. Gr. x^ixo?, a ring, £»&>?; Lat. Cartilugo anmdiformis; Fr. Cri- coide on unnulaire; Germ. Ringknorpel; Ital. Cricoide.—This cartilage, situated at the base of the larynx, which it supports, is the thickest and strongest of the whole assemblage of car- tilages. It is connected to the first ring of the trachea by elastic ligaments and mucous mem- brane. Its form, that of a ring, is not quite circular, but approaching to an elliptical figure. It is shallow in front, at c, e, (,) but it is thicker and deeper than the first ring of the trachea; and, posteriorly, it is considerably deeper than at its anterior part, in the propor- tion of eight to two and a-half. Fig. A B A, an anterior, B, the side view of the cricoid cartilage; a, the posterior superior margin -, b, b, the crico-arylenoid articulating surface; b,g,f,e, the superior descending margin ; d, e, the trachea! aperture of the cricoid ; a, d, the greatest, a, e, the least depth of surface ; a, e, the obliquity of the superior section to the axis ; h, the left surface articulating with the inferior cornua of the thyroid cartilage. The anterior external surface gives attach- ment to the crico-thyroid muscles (seeJig. 26); more posteriorly we find an apophysis for the articulation of the thyroid (h,Jig. 20, B). Its posterior surface is divided into two equal por- tions by a vertical ridge along its middle line, a, d, Jig. 20, B. This ridge, wh
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