VOCAL AND RESPIRATORY APPARATUS. 247 



The posterior surface has attached to it the arytenoid mus- 

 cle. The anterior surface has attached to it the thyro-arytenoid 

 muscle and the false vocal cord. The internal surfaces are op- 

 posed to each other and supplied with mucous membrane. Of 

 the three angles at the base, the outer gives attachment to the 

 crico-arytenoid muscle, lateral and posterior. The anterior is 

 prolonged for attachment of the true vocal cord. 



The cuneiform cartilages, or cartilages of Wrisberg, are two 

 small rod-shaped bodies extending upward from the arytenoid 

 cartilages into the aryteno-epiglottidean fold. 



FIG. 121. 



Vertical section of larynx: 1, body of hyoid bone; 2, epiglottis; 

 3, thyro-hyoid membrane; 4, great cornu of hyoid; 5, false vocal 

 cord; 6, thyro-hyoid ligament; 7, ventricle of larynx; 8, thyro-hyoid 

 membrane; 9, true vocal cord; 10, aryteno-epiglottidean fold; 11, 

 thyroid cartilage; 12, superior cornu of thyroid; 14, arytenoid 

 muscle; 16, arytenoid cartilage; 18, cricoid cartilage. 



The cartilages of the larynx, with the exception of the 

 epiglottis, are composed of true cartilage. 



The LIGAMENTS of the LARYNX are divided into two sets 

 the extrinsic, those connecting the epiglottis and thyroid car- 

 tilage with the hyoid bone, and the intrinsic, those which connect 

 the various cartilages together. The extrinsic consist of three : 



1. TJii/ro-liitoid tnrniliranr, connecting the upper border of the thy- 

 roid cartilage with the inner surface of the hyoid bone; 



2 and 3. 77/r lim lateral tluirn-lninhl ligaments, fibre-elastic cords 

 connecting the superior horns of the thyroid cartilage with the extrem- 

 ities of the great horns of the hyoid bone. They contain a small nodule, 

 the cartilago-triticea. 



