LARYNX AND PHONATION. 



351 



Fig. 89. Lozenge shape of the glottis, produced by. the action of the posterior 

 crico-arytenoid muscles.* 



Fig. 90. Occlusion of the interligamentous part of the glottis, t 



* Diagram showing a horizontal section of the cartilages of the larynx, at 

 the level of the base of the arytenoid cartilages. The dotted lines indicate the 

 new position of the cartilages, caused by the action of the muscles working in 

 the direction of the arrow. (L. Mandl, '* Traite" des Maladies du Larynx.") 



t Action of the lateral crico-arytenoid muscles, acting in the direction indi- 

 cated by the arrows, for the purpose of bringing the arytenoid cartilages and 

 the vocal cords into the position indicated by the dotted liues. (L. Mandl.) 



