. A treatise on practical anatomy: for students of anatomy and surgery . res. THE LARYNX. The larynx is placed in themedian line on the upper partof the trachea. It is a pyra-midal box composed of cartilages,fibrous tissue, and muscles. Thecartilag-es are nine in number:three single,—thyroid, cricoid,and emglottis; and three pairs,—ar^en,oid, cuneiform, and cor-nicula laryngis. The tliyroid consists of twoquadrilateral plates of cartilageimited in front at an acute plate is smooth and theposterior border terminates in thesuperior and inferior angle of junction forms aproj
. A treatise on practical anatomy: for students of anatomy and surgery . res. THE LARYNX. The larynx is placed in themedian line on the upper partof the trachea. It is a pyra-midal box composed of cartilages,fibrous tissue, and muscles. Thecartilag-es are nine in number:three single,—thyroid, cricoid,and emglottis; and three pairs,—ar^en,oid, cuneiform, and cor-nicula laryngis. The tliyroid consists of twoquadrilateral plates of cartilageimited in front at an acute plate is smooth and theposterior border terminates in thesuperior and inferior angle of junction forms aprojection at the anterior part of the neck called thepomum Adami, or Adams apple. The cricoid is a ring of cartilage shaped like a seal-ring, the narrow^ part in front. Posteriorly it presentstwo superior facets for the arytenoid cartilages, andlaterally a flicet for articulation with the thyroid. The epiglottis is a leaflet of yellows-fibre cartilagewhich is attached to the receding angle between the twoplates of the tliyroid. Its normal position is ^•ertical, but. Fig. 148.—Vertical, SectionOF Larynx. 1. body of hyoid bone; 2, epiglot-tis ; 3, thyro-hyoid membrane ; 4, gresitcornu of hyoid ; 5. false vocal cord : 6,thyro-hyoid ligament; 7, ventricle oflarynx ; 8, thyro-hyoid membrane; 9,true vocal cord; lU. aryteno-epiglot-tidean fold ; U, thyroid cartilage ; 12,superior cornu of thyroid ; 14, aryte-noides muscle ; 16. arytenoid cartilage ;18, coracoid cartilage. 344 PRACTICAL ANATOMY. on elevation of the larynx, as in swallowing, it is de-pressed and serves to cover the glottis. The arytenoid cartilages are trilateral pyramidswhich rotate on their bases. They are placed uponthe upper posterior part of the cricoid. Upon the apexof each cartilage is placed a small nodule of fibro-car-tilagCj the cornicula laryngis. The cuneiform are twoplates of cartilage placed in the aryteno-epiglottidianfolds. The ligaments of the larynx are intrinsic and ex-trinsic ; the extrinsic are
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
