THE LARYNX. 337 



air is forced through a narrow passage in the mouth, giving 

 rise to new sounds added on to those originated by the vocal 

 cords. In such manners the primitive feeble monotonous 

 tone due to the vocal cords is reinforced and altered in 

 various ways in throat and mouth, and voice is developed 

 into articulate speech. 



The Larynx consists of a framework of nine cartilages, 



FIG. 97. The more important cartilages of the larynx from behind, t, thy- 

 roid; Cs, its superior, and 6V, its inferior, horn of the right side; *#, cricoid 

 cartilage; t, arytenoid cartilage; Pv, the corner to which the posterior end of a 

 vocal cord is attached; Pi, corner on which the muscles which approximate or 

 separate the vocal cords are inserted; cu, cartilage of Santorini. 



movabty articulated together, and having muscles attached 

 to them by whose contractions their relative positions are 

 altered; the cartilages surround a tube, continuous below 

 with the windpipe, and lined by mucous membrane. At 

 one level in the laryngeal tube the vocal cords project and, 



Of what does the laryngeal framework consist? What do the 

 Cartilages of the larynx surround? How is the glottis formed? 



