. Diseases of the nose and throat . branches of the superior thyroid. The veinsempty into the superior, middle and inferior thyroid veins. The mucous membrane of the upper margin of the larynxand of the vocal cords is covered by squamous rest of the laryngeal cavity is lined with ciliated epithe-lium, continuous with that of the trachea and bronchi. THE MUSCLES OF THE LARYNX The extrinsic muscles of the larynx, or those which unite itwith other structures are: the thyrohyoid, the sternothyroid,the inferior constrictor of the pharynx and the stylo-pharyngeus. They raise and lower
. Diseases of the nose and throat . branches of the superior thyroid. The veinsempty into the superior, middle and inferior thyroid veins. The mucous membrane of the upper margin of the larynxand of the vocal cords is covered by squamous rest of the laryngeal cavity is lined with ciliated epithe-lium, continuous with that of the trachea and bronchi. THE MUSCLES OF THE LARYNX The extrinsic muscles of the larynx, or those which unite itwith other structures are: the thyrohyoid, the sternothyroid,the inferior constrictor of the pharynx and the stylo-pharyngeus. They raise and lower the whole larynx andwith it the trachea. The intrinsic muscles of the larynx are those which move ANATOMY AND PHYSIOLOGY OF THE LARYNX 255 different parts of the larynx itself. The principal ones arethe cricothyroids, the posterior cricoarytenoids, the lateralcricoarytenoids, the arytenoideus and the are also muscular fibers between the margins of theepiglottis and the arytenoid and thyroid cartilages. These. Fig. 51.—Diagram of the larynx, showing the muscles attached tothe arytenoid cartilages (after Gray). A, Arytenoid cartilage; C,Cricoid cartilage; T, Thyroid cartilage; ia, Arytenoideus muscle; pa,Posterior cricoarytenoid; la, Lateral cricoarytenoid, ta, Thyroarytenoid;vc, vocal cord. form part of the sphincter which closes the larynx duringswallowing. The cricothyroid muscles bring together the anteriormargins of the thyroid and cricoid cartilages, closing thecricothyroid space and stretching the vocal cords. Thecords being attached to the anterior angle of the thyroid infront, and through the arytenoids to the cricoid behind, aremade tense as the thyroid is pulled forward. 256 DISEASES OF THE NOSE AND THROAT The posterior cricoarytenoid muscles by pulling back-ward the outer angles of the arytenoid cartilages, rotate thevocal processes outward, and open the glottis. The lateral cricoarytenoid muscles, by pulling the outerangles of the arytenoid c
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectnose, bookyear1915
