ANATOMY OF THE LARYNX 



545 



Anatomy of the Larynx. The principal parts entering into the formation of 

 the larynx, figures 342 and 343, are the thyroid cartilage ; the cricoid cartilage; 

 the two arytenoid cartilages ; and the. two true vocal cords. The epiglottis, 

 figure 343, has but little to do with the voice, and is chiefly useful in pro- 

 tecting the upper part of the larynx from the entrance of food and drink in 



FIG. 342. Cartilages of the Larynx Seen from the Front, i to 4, Thyroid cartilage; i, 

 vertical ridge or pomum Adami; 2, right ala; 3, superior, and 4, inferior cornu of the right 

 side; 5, 6, cricoid cartilage; 5, inside of the posterior part; 6, anterior narrow part of the 

 ring; 7, arytenoid cartilages. X f . 



deglutition. The false vocal cords and the ventricle of the larynx, which is a 

 space between the false and the true cord of either side, need be only referred to. 

 Cartilages. a, The thyroid cartilage, figure 342, i to 4, does not form a 

 complete ring around the larynx, but only covers the front portion, b, The 

 cricoid cartilage, figure 342, 5, 6, on the other hand, is a complete ring; the 



Lig. Ary. epiglott. 



Cart. Wrisbergii. 

 Cart. Santorini. 



Cart, aryten. 

 Troc. muscul. 



Lig. crico-aryten. 



Dig. cerato-crico. post. sup. 



Cornu. infer. 



Lig. carat-crico. post. inf. 



Cart, tracheae 



Pars, membran. 



FIG. 343. The Larynx as Seen From Behind after Removal of the Muscles. The cartilages 

 and ligaments only remain. (Stoerk.) 



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, figure 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 motion between them. 



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



35 



