538 



HANDBOOK OF PHYSIOLOGY. 



back part of the ring being much broader than the front. On the top of this 

 broad portion of the cricoid are (c) the arytenoid cartilages (fig. 342, 7) , the 

 connection between the cricoid below and arytenoid cartilages above being a joint 

 with synovial membrane and ligaments, the latter permitting tolerably free 



Fig. 342. Cartilages of the larynx seen from the front. 1 to 4, thyroid cartilage; 1, verti- 

 cal ridge or pomum Adami ; 2, right ala; 3, superior, and 4, inferior cornu of the right side; 5, 6, 

 cric9id cartilage ; 5, inside of the posterior part ; 6, anterior narrow part of the ring ; 7, arytenoid 

 cartilages. X M. 



motion between them. But although the arytenoid cartilages can move on the 

 cricoid, they of course accompany the latter in all its movements, just as the 

 head may nod or turn on the top of the spinal column, but must accompany 

 it in all its movements as a whole. 



Joints and Ligaments. The thyroid cartilage is also connected with the 

 cricoid, not only by ligaments, but also by joints with synovial membranes ; 

 the lower cornua of the thyroid clasping, or nipping, as it were, the cricoid 

 between them, but not so tightly but that the thyroid can revolve, within a 



Xig. Ary.-eplglott. 



risfcergii 

 Cart. Santorini * i 



Cart, aryten. 

 Troc. muscul. 



Irfgi crico-aryten. 

 Ijfg, peratoeCrico. post, "sup. 



Cornu Jnfei'._ 

 lag, catafeeiico.i>ost. jni. 



Cart, tntcheoj 



Pars membran.. 



Fig. 343. The larynx as seen from behind after removal of the muscles. The cartilages and lig- 

 aments only remain. (Stoerk.) 



certain range, around an axis passing transversely through the two joints at 

 which the cricoid is clasped. The vocal cords are attached (behind) to the 

 front portion of the base of the arytenoid cartilages, and (in front) to the 

 re-entering angle at the back part of the thyroid ; it is evident, therefore, that all 



