THE VOICE. 



595 



effect on the vocal bands of tlie movements of the arytenoid 

 cartilages. These are most marked around a vertical axis, giv- 

 ing rise to an inward and outward movement of rotation, but 



Pig. 433. — Diagrammatic section of larynx to illustrate action of JPosterior cHco-aryte 

 Tioid muecie (after Landois). In tnis and the two following figures the dotted 

 lines indicate the new position of the parts owing to the action of the muscles 

 concerned. 



there are also movements of less extent in all directions. It is 

 in fact through the movements of these cartilages to which the 



Fig. 434. — Diagrammatic section of larynx to illustrate action of Arytemideus jyi'O- 

 prins muscle (after Landois). 



