. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. LARYNX. 127 cricoid, and passes backwards to be inserted into the inferior cornu of the thyroid ; it draws these two cartilages together obliquely. Posterior crico-arytenoid,^ arises from the flat surface on the back of the cricoid, and is inserted into the posterior part of the base of the arytenoid; it draws the arytenoid backwards, and thus tightens the vocal ligaments. (Fig. 110.) Lateral crico-arytenoid.^—Arises
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. LARYNX. 127 cricoid, and passes backwards to be inserted into the inferior cornu of the thyroid ; it draws these two cartilages together obliquely. Posterior crico-arytenoid,^ arises from the flat surface on the back of the cricoid, and is inserted into the posterior part of the base of the arytenoid; it draws the arytenoid backwards, and thus tightens the vocal ligaments. (Fig. 110.) Lateral crico-arytenoid.^—Arises from the side of the cricoid, and is inserted into the side of the base of the arytenoid ; it separates the arytenoid, and widens the glottis. Thyreo-arytenoidJ^ — Fig. 110. Fig. Arises from the posterior face, and near the angle of the thyroid, and is in- serted into the anterior surface of the arytenoid, which it draws forwards, and thus relaxes the vocal ligaments. Oblique arytenoid.^— It consists of oblique fibres arising from the tip of one cartilage, and inserted into the top of another. (Fig. 111.) Transverse arytenoid.^—Arises from the side of one cartilage, and is inserted into the side of the other. These last two muscles are often considered as one, and by them the glottis is narrowed. Thyreo-epiglottideus.—Consists of a few fibres passing between these two cartilages. Aryteno-epiglottideus, are also a few indistinct fibres passing be- tween the cartilages from which it derives its name. These last two draw the epiglottis downwards. TRACHEA. The trachea is a cylindrical tube, four or five inches in length, reaching from the larynx as low as the third dorsal vertebra, where it divides into the bronchi. It is formed of from sixteen to twenty cartilages, united by ligamentous tissue, which is of an elastic cha- racter. Each ring is about two lines broad and constitutes two- thirds of a circle; the first ring is the largest, and the last ring is of such
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