336 



TEXT-BOOK OF PHYSIOLOGY. 



opening of the larynx, the glottis, is triangular in shape, the base 

 being directed upward and forward, the apex downward and back- 

 ward. The inclination of the glottic opening is almost vertical. 



The cavity of the larynx is partially subdivided by the inter- 

 position of the vocal bands into a superior and an inferior portion. 



13 -; 



19 



FIG. 157. TRACHEA AND BRANCHIAL TUBES, i, 2. Larynx. 3, 3. Trachea. 4- 

 Bifurcation of trachea. 5. Right bronchus. 6. Left bronchus. 7. Bronchial 

 division to upper lobe of right lung. 8. Division to middle lobe. 9. Division 

 to lower lobe. 10. Division to upper lobe of left lung. n. Division to lower 

 lobe. 12, 12, 12, 12. Ultimate ramifications of bronchi. 13, 13, 13, 13- 

 Lungs, represented in contour. 14, 14. Summit of lungs. 15, 15. Base of 

 lungs. (Sappey.) 



The opening, bounded by the vocal bands, is also triangular in shape, 

 though in this case the base is directed backward, the apex forward. 

 (See chapter on Voice and Speech. )^ 



The introduction of the vocal bands narrows at this level the air- 

 passage and to some extent interferes with the free entrance of air. 



