PRODUCTION OF VOCAL SOUNDS. 



613 



Fig. 166.* 



cartilages look as if they were trying to hide themselves 

 under it (fig. 168). 



The epiglottis, by being somewhat pressed down so as to 

 cover the superior cavity of the larynx, serves to render the 

 notes deeper in tone, and at 

 the same time somewhat 

 duller, just as covering the 

 end of a short tube placed 

 in front of caoutchouc 

 tongues lowers the tone. 

 In no other respect does 

 the epiglottis appear to 

 have any effect in modify- 

 ing the vocal sounds. 



The degree of approx- 

 imation of the vocal cords 

 also usually corresponds 

 with the height of the 

 note produced; but pro- 

 bably not always, for the 

 width of the aperture has 

 no essential influence on 

 the height of the note, as 

 long as the vocal cords 



Wrisberg ; s, that of the cartilages of Santorini ; a, the tip or summit 

 of the- arytenoid cartilages ; cv, the true vocal cords or lips of the rima 

 glottidis ; cv s, the superior or false vocal cords ; between them the 

 ventricle of the larynx ; in C, tr is placed on the anterior wall of the 

 receding trachea, and b indicates the commencement of the two hronchi 

 heyond the bifurcation which may be brought into view in this state of 

 extreme dilatation (from Quain's Anatomy). 



* Fig. 1 66. View of the larynx and part of the trachea from behind, 

 with the muscles dissected : h, the body of the hyoid bone ; e, epiglottis ; 

 t, the posterior borders of the thyroid cartilage ; c, the median ridge of 

 the cricoid ; , upper part of the arytenoid ; s, placed on one of the 

 oblique fasciculi of the arytenoid muscle ; #, left posterior crico-ary tenoid 

 muscle ; ends of the incomplete cartilaginous rings of the trachea ; 

 /, fibrous membrane crossing the back of the trachea ; n, muscular fibres 

 exposed in a part (from Quain's Anatomy). 



