MOUTH CAVITY. 



309 



ceeded by i\\z pharynx or throat cavity, which narrows at 

 the top of the neck into the gullet or oesophagus; this runs 

 down through the thorax and, passing through the dia- 

 phragm, dilates in the upper part of the abdominal cavity 

 into the stomach. Beyond 

 the stomach the channel again 

 narrows to form a long and 

 greatly coiled tube, the small 

 intestine, which terminates by 

 opening into the large intes- 

 tine, much shorter although 

 wider than the small, and ter- 

 minating by an opening on ^ 

 the exterior. 



The Mouth Cavity (Fig. 

 89) is bounded in front and 

 on the sides by the lips and 

 cheeks, below by the tongue, 

 k, and above by the palate; 

 which latter consists of an an- 

 terior part, /, supported by 

 bone and called the hard pal- 

 ate, and a posterior, /, con- 

 taining no bone, and called 

 the soft palate. The two can 

 readily be distinguished by 



applying the tip Of the tongue FIG. 89. -The mouth, nose and pha- 



,1* j, p J.T i.i i rynx, with the commencement of the 



tO the roof Of the mOUth and /ullet and larynx, as exposed by a 



jj ^ , i i i mi section, a little to the left of the me- 



d rawing it backwards. The dian plane of the head, a, vertebral 



linvrl rvilafa fm-me fVio -nnvfi oolumn ; b, gullet; c, windpipe : d, 



i pdiau larynx : e, epiglottis ; f. soft palate ; 



tion between the mouth and ft^&ffi~ff^ 

 nose. The soft palate arches ^^^Wojgj^., 



down Over the back of the o. pg, the tubinate bones of the out- 

 er tide of the left nostril chamber. 



mouth, hanging like a cur- 

 tain between it and the pharynx, as can be seen by holding 

 the mouth open in front of a looking-glass. From the 

 middle of its free border a conical process, the uvula, hangs 

 down. 



The Teeth. Immediately within the cheeks and lips are 



