484 



MANUAL OF PHYSIOLOGY. 



to the trachea which it joins to the others. It forms a ring, which 

 is thin in front, but deep and thick behind, owing to a peculiar 

 projection upwards of its posterior part. The thyroid consists of 

 two side wings so bent as to form the greater part of the anterior 



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 continued into 4, 

 trachea ; e, epiglottis ; e', its cushion ; t, thyroid cartilage seen in section. 

 vl, true vocal cord at the riraa glottidis; s, ventricle of larynx; s / , saccule. 

 (A. Thomson.) 



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 backwards and forwards. 



