. Kirkes' handbook of physiology . art of the thyroid; it is evident,therefore, that all movements of either of these cartilages must produce an effect on themof some kind or other. Inasmuch, too, as the arytenoid cartilages rest on the top of theback portion of the cricoid cartilage, and are connected with it by capsular and other liga-ments, all movements of the cricoid cartilage must move the arytenoid cartilages, and alsoproduce an effect on the vocal 482 MUSCLE-NERVE PHYSIOLOGY Intrinsic Muscles. The intrinsic muscles of the larynx are so connected with thelaryngeal cartilages th
. Kirkes' handbook of physiology . art of the thyroid; it is evident,therefore, that all movements of either of these cartilages must produce an effect on themof some kind or other. Inasmuch, too, as the arytenoid cartilages rest on the top of theback portion of the cricoid cartilage, and are connected with it by capsular and other liga-ments, all movements of the cricoid cartilage must move the arytenoid cartilages, and alsoproduce an effect on the vocal 482 MUSCLE-NERVE PHYSIOLOGY Intrinsic Muscles. The intrinsic muscles of the larynx are so connected with thelaryngeal cartilages that by their contraction alterations in the condition of the vocal cordsand glottis are produced. They are usually divided into four classes according to theiraction, viz., into abductors, adductors, sphincters, and tensors. The Abductors, the crico-arytenoidei, widen the glottis, by separating the cords; the Adductors, consisting of thethyro-ary-epiglottici, the arytenoideus posticus seu transversus, the thyro-arytenoidei externi,. Fig. 344.—The Cartilages and Ligaments of the Larynx, Viewed from the Front, a. Epiglottis;b, hyoid bone; c, cartilago tritica; d, thyro-hyoid membrane; e, superior cornu of thyroid cartilage-j, thyroid notch; g, pomum Adami; /;, crico-thyroid membrane; i, inferior cornu of thyroid cartilage;f, cricoid cartilage. (Cunningham.) the crico-arytenoideilaterales, and the thyro-arytenoidei interni, approximate the vocal cords,diminish the rima glottidis, and act generally as sphincters and supporters of the , the tensors of the cords put the cords on the stretch, with or without elongatingthem; the tensors are the crico-thyroidei and the thyro-arytenoidei inter ni. The attachments and the action of the muscles will be readily understood from thefollowing table. All the muscles are in pairs except the arytenoideus posticus. Table of the several Groups of the Intrinsic Muscles of the Larynx and their Attachments. Group. Muscle. Attachments.
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