ANATOMY OF THE LARYNX. 



487 



and lateral boundaries of the voice box, and can be felt easily in 

 the front of the throat. It is articulated to the sides of the cricoid 

 by its two inferior and posterior extremities, so that the upper 

 part of the cricoid cartilage can move backward and forward. 



FIG. 196. 



FIG. 196. Anterior half of a transverse section through the larynx near its middle. 

 More is cut away on the upper part of the right side. 1. Upper division of the 

 laryngeal cavity; 2. Central portion; 3 Lower portion coutiuued into 4. trachea; 

 , epiglottis; e', its cushion; I, thyroid cartilage seen in section, vl, true vocal cord at 

 the ritna glottidis; *, ventricle of larynx; *', suceule. (A. Thomson.) 



FIG. 197. Three diagrams taken from laryngoscopic views of the superior aperture 

 of the larynx, showing the position of the vocal cords and the arytenoid cartilages 

 supposed to be seen in transverse section during different actions of the larynx. 

 A'. Vocal chink as in singing. B'. In easy, quiet inhalation of air. </. In forced 

 inspiration. 



The arytenoid cartilages are little three-sided pyramidal masses 

 placed on the upper surface of the posterior part of the cricoid, 

 to which they are attached by a loose joint. They are so placed 



