THE LARYNX. 



313 



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

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

 kept open. 



FiE 



(2) The arytenoid cartilages (Fig. 203 I 

 pair of cartilages placed 

 in front of the cricoid 

 cartilage, one on each 

 side. Each cartilage is 

 semilunar in shape, con- 

 cave 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 vary 

 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. 



II, Ca, Co}) are a 



. 204. 



