434 



ELEMENTAR Y ANA TOMY. 



[LESS. 



Sixth Lesson of " Elementary Physiology," and its bony 

 framework in the Third Lesson of the present course. It 

 is bounded externally by fleshy and movable lips ; while be- 

 hind, a transverse fold of skin and muscle (called the soft 



FIG. 370. A SECTION OF THE MOUTH AND NOSE, taken vertically a little to the 

 left of the middle line. 



a, the vertebral column ; b, the gullet : f, the windpipe ; d, the thyroid cartilage 

 of the larynx ; e, the epiglottis ; f. the uvula ; g, the opening of the left 

 Eustachian tuhe ; k, the opening of the left lachrymal duct ; /", the hyoid bone ; 

 k, the tongue ; /, the hard palate ; /, , the base of the skull ; o, p, g, the 

 superior, middle, and inferior turbinal bones. The letters g,f, e, are placed 

 in the pharynx. 



palate, or velutri) hangs down, from the middle of which a 

 prolongation called the uvula depends. Behind this trans- 

 versely extended curtain is situate the posterior aperture of 

 the nostrils, which thus open, not into the mouth proper, but 

 into the pharynx. 



The Eustachian tubes also open into the pharynx above. 



