THE LARYNX AND ARTICULATE SPEECH. 241 



quite so large, extend downward a short distance, shown at 

 C z, in the same figure. On the signet of the cricoid behind 



Fig. 93. THE CARTILAGES OF THE LARYNX FROM BEHIND. 



t, thyroid; Cs, Ci, superior and inferior horns of thyroid; **, cricoid cartilage; t, 

 arytenoid cartilage; Pv, corner to which the posterior end of vocal cord is attached; Pm, 

 point of insertion of the muscles which approximate or separate the vocal cords; co, 

 cartilage of Santorini. 



are placed the two arytenoid cartilages. These arytenoid 

 cartilages are so placed on the cricoid as to permit a good 

 deal of motion. They can be pulled apart, approximated, 

 and even rotated by muscles which reach them. Bach ary- 

 tenoid cartilage is a triangular structure with its base rest- 

 ing on the cricoid. On the top of each arytenoid cartilage 

 is situated a small cartilage known as the cartilage of San- 

 torini. A little forward of this on each side is finally a still 

 smaller cartilage known as the cartilage of Wrisberg. In 

 order to understand the manipulation of the voice-box, how- 

 ever, no special attention need be paid to either the car- 

 tilages of Santorini or Wrisberg. 



From the inner corner of the base of each arytenoid car- 

 tilage, marked P v in the diagram, there extends forward 

 across the larynx to be inserted in front in the thyroid car- 

 tilage, an elastic membrane, the true vocal cord. These 

 cords are, however, not separate and distinct strings but 



