THE LARYNX, AND ITS ACTIONS. 



[Fig, 72. 



297 



A front view of the Thyroid Cartilage; 1, left 

 half of the cartilage ; 2, anterior projecting angle ; 

 3, superior margin ; 4, its notch , 5, inferior mar- 

 gin; 6, 6, cornu majus of each "half; 7, 7, cornu 

 minus of each half. 



A front view of the Cricoid Cartilage ; 1, its 

 internal face ; 2, the cavity of the larynx as 

 formed by this cartilage ; 3, its inferior surface ; 

 4, the little head or convexity for articulating 

 with the arytenoids; 5, ihe surface of the supe- 

 rior edge for the attachment of the lateral crico- 

 arytenoid muscles.] 



Fig. 73. 



External and sectional views of the Larynx, after Willis ; A n B, the cricoid cartilage ; E c G, the thyroid 

 cartilage; G, its upper horn ; c, its lower horn, where it is articulated with the cricoid; F, the arytenoid 

 cartilage; E F, the vocal ligament; A K, crico-thyroideus muscle; F e m, thyro-arytenoideus muscle; x. e, 

 crico-arytenoideus lateralis ; s, transverse section of arytenoideus transversus ; m n, space between thyroid 

 and crycoid; B L, projection of axis of articulation of arytenoid with thyroid. 



changes of size, whilst a range of different tones is sounded: it will then be 

 observed that, the higher the note, the more the two cartilages are made to 

 approximate, whilst they separate in proportion to the depth of the tones.* 



* In making; this observation, it is necessary to put out of view the general movement 

 of the larynx itself, which the finger must be made to follow up and down. 



