THE VOICE. 



5. The names of -the cartilages are (1) the thyroid, 

 which is a broad thin plate, bent in the middle and placed 

 in the central line of the front part of the neck, where it 

 is known as the pomum Adami, or 



Adam's apple (Fig. 55, B), and 

 where it may be felt moving up 

 and down with each act of swal- 

 lowing; (2) the cricoid, which is 

 shaped like a seal ring, with the 

 broad part placed posteriorly (Fig. 

 55, E). At the top of the cricoid 

 cartilage are situated the two small 

 arytenoid cartilages, the right one 

 of which is shown in Fig. 55, c. 

 These latter little organs are much 

 more movable than the other two, 

 and are very important in the pro- 

 duction of the voice. They have 

 a true ball and socket joint, and 

 several small muscles which con- 

 tract and relax with as perfect regu- 

 larity and accuracy as an-y of the 

 larger muscles of the body. 



6. The interior of the larynx is SECTION ? r ^ A ulYNX AND 

 lined with a very sensitive mucous ^; 



membrane, which is much more g, 

 closely adherent to the parts be- f ; 

 neath than is usually the case with H ' The Trachea - 

 membranes of this description. The epiglottis (A), con- 

 sisting of a single leaf-shaped piece of cartilage, is attached 

 to the front part of the larynx. It is elastic, easily moved, 

 and fits accurately over the entrance to the air-passages 

 below it. Its office is to guard these delicate passages and 

 the lungs against the intrusion of food and other foreign 



5. Names, formation, and situation of the eartilasres ? 



6, Lining of the interior of the larynx ? The epiglottis ? 



