THE LARYNX. 



313 



fa 1 - 



the cricoid cartilage are the apertures of the roots of the lungs 

 (Fig. 203), which, by their attachments to these cartilages, are 

 kept open. 



(2) The arytenoid cartilages (Fig. 203 I, II, Ca, Co 1 ) are a 

 pair of cartilages placed 

 in front of the cricoid 



cartilage, one on each Fl - 20 4- 



side. Each cartilage is 

 semilunar in shape, con- 

 rave internally, and 

 convex externally. The 

 cartilages are placed 

 almost vertically, with 

 their posterior borders 

 or bases parallel to the 

 body of the cricoid car- 

 tilage. The superior 

 borders (Fig. 204) are 

 directed upwards and 

 forwards, the inferior 

 downwards and for- 

 wards. The superior 

 and inferior borders are 

 separated by a semicir- 

 cular notch, bounded by 

 two sharp apices. The 

 superior and inferior 

 angles of the two car- 

 tilages are close to- 

 gether, and movably 

 attached to each other 

 by connective-tissue. 



These cartilages varv 

 very greatly in the two 

 sexes. In the males 

 they are thick, strong, 

 and large ; in the female 

 the cartilages are very 

 thin, more hollowed and 

 much smaller. 



The larynx and surrounding parts, seen from the ventral 

 surface. 



' '! Arytenoid cartilages. 



Cli-CH Cricoid cartilage. 



G, Gi Fibrous tissue connect- 

 ing the larynx with 

 the posterior cornua 

 of the hyoid. 



H Lesser cornua of the 

 hyoid. 



HH Greater cornua of the 

 hyoid. 



L'j Right lung. 



<;! Left lung. 



.V Fibrous membrane fill- 

 ing the ring-like cri- 

 . coid cartilage. 



Ph* The M. petrohyoideus 

 tertius. 



S Part of tendon of M. 

 petrohyoideus ter- 

 tius. 



SB, SB 1 Mucous membrane 

 bulging from the an- 

 terior ventricle of the 

 larynx. 



Sp Spinous process of the 

 cricoid cartilage. 



ZK Body of the hyoid. 



