. Twentieth century practice; an international encyclopedia of modern medical science by leading authorities of Europe and America . thus separating the vocal lateral crico-arytenoids passing from the outer angle of eacharytenoid forwards to the inner surface of the cricoid ring, directly antagonize the former muscles, rotatingthe arytenoid cartilages inwards, thusclosing the cords. This action becomesof exceeding importance in certain dis-eased conditions, and is well illustratedin Figs. 37 and 38. The arytenoid mus-cle i^asses from the posterior face of onearytenoid to that of the
. Twentieth century practice; an international encyclopedia of modern medical science by leading authorities of Europe and America . thus separating the vocal lateral crico-arytenoids passing from the outer angle of eacharytenoid forwards to the inner surface of the cricoid ring, directly antagonize the former muscles, rotatingthe arytenoid cartilages inwards, thusclosing the cords. This action becomesof exceeding importance in certain dis-eased conditions, and is well illustratedin Figs. 37 and 38. The arytenoid mus-cle i^asses from the posterior face of onearytenoid to that of the other, thus draw-ing the cartilages together and aiding toclose the glottis. Stretched along theunder surface of each vocal cord we havethe thyroid-arytenoid muscles composedof different sets of muscular fibres whoseaction is in contraction to render tensethe vocal cords, thus regulating the pitchof the voice, a function which is to a cer-tain extent aided by a muscle on the anterior surface of the cartila-ginous framework of the larynx, the crico-thyroid, which draws thethyroid down upon the cricoid, thus rendering it Fig. 37.—The Glottis-Opening Actionof the Posterior Crico-ArytenoidMuscles, shown diagrammatically. GENERAL CONSIDERATIONS. 317
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmedicine, bookyear1895
