298 



OF THE VOICE AND SPEECH. 



Upon the upper surface of the back of the cricoid, are seated the two small 

 Arytenoid cartilages ; these are fixed in one direction by a bundle of strong 



[Fig. 74. 



A posterior view of the left Arytenoid Carti- 

 lages ; 1, its posterior face ; 2, the summit ; 3, the 

 base and cavity for articulating with the cricoid 

 cartilage ; 4, its external angle ; 5, its internal 

 angle. 



An anterior view of the left Arytenoid Carti- 

 lages ; 1, its anterior face. The other references 

 as in the accompanying figure.] 



ligaments, which tie them to the back of the cricoid ; but they have some 

 power of moving in other directions upon a kind of articulating surface. The 

 direction of the surface, and the mode in which these cartilages are otherwise 

 attached, cause their movement to be a sort of rotation in a plane, which is 



Fig. 75. 



Bird's-eye view of Larynx from above, after 

 Willis; G E H, the thyroid cartilage, embracing 

 the ring of the cricoid r u x to, and turning upon 

 the axis x z, which passes through the lower 

 horns, c, Fig. 73; N F, N F, the aryterioid carti- 

 lages, connected by the arytenoideus transversus; 

 T v, T v, the vocal ligaments ; NX, the right crico- 

 arytenoideus lateralis (the left being removed) ; 

 v kf, the left thyro-arytenoideus, (the right being 

 removed) ; N /, N I, the crico-arytenoidei postici ; 

 B B, the crico-arytenoid ligaments. 



[Fig. 76. 



A vertical section of the Larynx to show its 

 internal surface ; 1, section of the root of the 

 tongue; 2, os hyoides; 3-, the muciparous gland 

 of the epiglottis ; 4, top of the epiglottis cartilage ; 

 5, a section of its anterior face ; 6, a fold of mu- 

 cous membrane from the arytenoids to the epi- 

 glottis; 7, superior vocal ligament; 8, section of 

 thyroid cartilage ; 9, ventricle of Galen or Mor- 

 gagni; 10, lower vocal ligament; 11, arytenoid 

 cartilages; 12, inside of the cricoid cartilage ; 13, 

 its posterior portion ; 14, lining membranes of the 

 trachea; 15, end of the cornu majus of the os 

 hyoides ; 16, cornu majus of the thyroid cartilage ; 

 17, mucous membrane of the pharynx ; IS, oeso- 

 phagus ; 19, thyroid gland.] 



