488 



THE VOICE 



ridges are made up mainly of elastic tissue running in the 

 membrane from the front angle of the thyroid cartilage 

 to their attachments at the base of the arytenoid cartilages. 

 These ridges are the true vocal cords. They have a 

 glistening white color and sharp smooth edges. In ordi- 



FiG. 228 — I, The vocal cords in the larynx as seen with larynxoscope; A, when 

 voice is being produced; B, when no voice is produced; e, epiglottis; cf, vocal 

 cords; cvs, false vocal cords; a, s, w, elevations due to cartilages; I, root of 

 tongue. II, A, the cords alone when voice is being produced; B, vocal cords 

 when no voice is produced. 



nary breathing they are separated, forming a V-shaped 

 opening to the glottis. 



The ar3d;enoids are united to one another and to the 

 cricoid cartilages by bands of muscle. By means of these 

 muscles they may be pulled forward, backward, or to one 

 side. These muscle movements affect the cords attached 

 to the arj^enoids, pulling them apart, or by their back- 

 ward movement varying the cord tension. 



Vocalizing. — In ordinary breathing the arytenoids are 



