548 



THE HUMAN BODY 



largest of the paired cartilages; they are seated on the upper 

 edge of the posterior wide portion of the cricoid, and form 

 true joints with it. Each is 

 pyramidal with a triangular 

 base, and has on its tip a small 

 nodule (co, Fig. 146), the carti- 

 lage of Santorini. From the tip 

 of each arytenoid cartilage the 

 aryteno-epiglottic fold of mucous 

 membrane (10, Fig. 147) extends 

 to the epiglottis ; the cartilage of 

 Santorini causes a projection 

 (8, Fig. 147) in this, and a little 

 farther on (9) is a similar emi- 

 nence on each side, caused by 

 the remaining pair of cartilages, 

 known as the cuneiform, or car- 

 tilages of Wrisberg. 



The Vocal Cords are bands of 

 elastic tissue which reach from 

 the inner angle (Pv, Fig. 146) of 

 the base of each arytenoid carti- 

 lage to the angle on the inside 

 of the thyroid where the sides 



f ,1 TT- "i J.T xi FIG. 147* The larynx viewed from 



Of the V Unite; they thus meet its pharyngeal opening. The back wall 



in front but are separated at ** ?nfS^d ^de^^bSdy of 



their Other ends. The COrds hyoid ; 2, its small, and 3, its great, horns; 



, . 4, upper and lower horns of thyroid car- 



are not, however, bare Strings, tilage; 5, mucous membrane of front of 



like those of a harp, but covered 1S; c ^uppe^'end^of ^iiSf?! 



Over With the lining muCOUS windpipe, lying in front of the gul'let'; 



8, eminence caused by cartilage of ban- 

 membrane Of the larynx, a Silt, torini; 9, eminence caused by cartilage 

 11 i ,i 7 ,, . / TV i AI\ of Wrisberg; both lie in, 10, the aryteno- 



Called the glottis (C, Jblg. 147), ep i g i ot tic fold of mucous membrane, sur- 



being left between them. It is 1 S^^^^ x ^ x ^ I ^ di ^ 8 p ^^^ 



the projecting Cushions formed tip of epiglottis ;c, the glottis, the lines 

 . . leading from the latter point to the free 



by tnem On each Side OI this vibratory edges of the vocal cords, b', 

 ?lit whiph nrp Qpt in vihratirm the ventricles of the larynx; their upper 

 oiiu wiiii/ii cut; ecu in viui cttujii orjjyog marking them off from the emi- 



during phonation. Above each nences b, are the false vocal cords. 



vocal cord is a depression, the ventricle of the larynx (&', Fig. 147); 

 this is bounded above by a somewhat prominent edge, the false 



