THE VOICE 



385 



Uryn. 



(the ' ' Adam's apple ") at the front of the throat. During 

 breathing, the larynx drops down, and there is free com- 

 munication between the nasal passages 

 and the trachea. 



The trachea is a rounded tube about 

 an inch in diameter. It holds its shape 

 because of a number of pieces of cartilage ; 

 these are bent in the shape of a C. The 

 trachea divides into two passages, or 

 bronchi, one of which goes to each lung. 

 The bronchi divide and subdivide into 

 the bronchial tubes. The smallest of 

 these end in the air cells of the lungs. 



389. The Voice. The larynx not only FlG - ^ 



, ^ * The Larynx, the Tra- 



forms the opening from the throat to the chea, and the Bron- 

 chial Tubes. 



trachea, but it also holds the chief organs 



of the voice, the vocal cords (Fig. 290). The vocal cords 



are two strips of connective tissue fastened to the cartilages 



Producing Sound 



FIG. 290. 

 The Vocal Cords. 



Quiet Breathing 



of the larynx. When not in use they are drawn aside, 

 leaving a V-shaped opening. The cords are brought into 

 use by means of muscles. These act on the cartilages of 



