LECT. XVIII. ORGAN OF VOICE IN MAN. 



335 



\ve find two other folds, analogous to the preceding, and 

 which are termed the superior ligaments of the glottis. The 

 cavities formed by this arrangement, between the superior 



Fig. 89. 



Bird's eye view of the larynx 

 from above, o E H, the thyroid 

 cartilage, embracing the ring of 

 the cricoid r u x w, and turning 

 upon the axis z z, which passes 

 through the lower horns, N F, 

 N F, the arytenoid cartilages, 

 connected by the arytenoideus 

 iransversus; T v, T v, the voca! 

 ligaments; N x, the right crico- 

 arytenoideus lateralis (the left 

 being removed ;)v ft/, the left thy- 

 ro-arytenoideus (the right being 

 removed ;) N I, N I, the crico-aryte- 

 noidei postici ; B, B, the crico 

 arytenoid ligaments. 



and inferior ligaments, have received the name of ventricles 

 of the larynx. The chink directed from before backwards, 

 and comprised between the two vocal cords, is called the 

 glottis. Lastly, above this chink, we observe a fibro-carti- 

 laginous tongue-like body, fixed by its base beneath the 

 root of the tongue; and which in the act of deglutition is 

 inclined downwards, so as to cover the glottis, but during 

 expiration is placed obliquely : this body is the epiglottis. 

 The dimensions of the glottis are as follows: its length is 

 from 25 to 30 millimetres; the space between the two lips, 

 which is extremely small in front, is from 7 to 8 millimetres 

 posteriorly: these lips, moreover, are capable of being 

 brought nearer together, so as to touch. The depth of the 

 ventricle is from 25 to 30 millimetres, and their greatest 

 possible height 15 millimetres. The superior walls of the 



