598 



THE HUMAN BODY. 



projecting cushions formed by them on each side of this 

 slit which are set in vibration during phonation. Above 

 each vocal cord is a depression, the ventricle of the larynx, 

 (b 1 . Fig. 157); this is bounded above by a somewhat promi- 



FIG. 15?. The larynx viewed from its pharyngeal opening. The back wall of 

 the pharynx has been divided and its edges (11) turned aside. 1, body of hyoid ; 

 2, its small, and 3, its great, horns; 4, upper and lower horns of thyroid carti- 

 lage ; 5, mucous membrane of front of pharynx, covering the back of the cricoid 

 cartilage; 6, upper end of gullet; 7, windpipe, lying in front of the gullet; 8, 

 eminence caused by cartilage of Santorini; 9, eminence caused by cartilage of 

 Wrisberg; both lie in, 10, the aryteno-epiglottidean fold of mucous membrane, 

 surrounding the opening (aditus laryngis) from pharynx to larynx, a, project- 

 ing tip of epiglottis; c, the glottis, the lines leading from the letter point to the 

 free vibratory edges of the vocal cords. &', the ventricles of the larynx: their 

 upper edges, marking them off from the eminences 6, are the false vocal cords. 



nent edge, the false vocal cord. Over most of the interior 

 of the larynx its mucous membrane is thick and covered by 

 ciliated epithelium, and has many mucous glands im- 

 bedded in it. Over the vocal cords, however, it is repre- 

 sented only by a thin layer of flat non-ciliated cells, and 



