518 



DIGESTION. 



Fig. 214. 



Cavity of the Mouth, as shown by dividing the An- 

 gles and turning off the Lips. 



1. Upper lip, turned up. 2. Its frsenum. 3. Lower 

 lip, turned down. 4. Its fraenum. 5, Internal sr -face 

 of cheeks. 6: Opening of duct of Stenrt. 7. F jf of 

 mouth. 8. Anterior portion of lateral half arches. 9. 

 Posterior portion of lateral half arches. 10. Velum 

 pendulum palati. 11. Tonsils. 12. Tongue. 



Fig. 2 1 5. 



of uvula. It is composed of 

 two mucous membranes, and of 

 muscles. One of the mem- 

 branes, that forming its ante- 

 rior surface is a prolongation 

 of the membrane lining the 

 mouth, and contains numerous 

 follicles ; the other, forming its 

 posterior surface, is an extension 

 of the mucous membrane lining 

 the nose, and is redder, and less 

 provided with follicles than the 

 other. The muscles that con- 

 stitute the body of the velum 

 palati are the circumflexus 

 palati or spheno-salpingo-sta- 

 phylinus of Chaussier; the leva- 

 tor palati or petro-salpingo-sta- 

 phylinus ; and the azygos uvulae 

 or palato-staphylinus. The 

 velum is moved by eight mus- 



Fig. 216. 



Fig. 217. 



Pharynx seen from behind. 



1. A section carried transversely through base of 

 skull. 2,2. Walls of pharynx drawn to each side. 

 3, 3. Posterior nares, separated by vomer. 4. Ex- 

 tremity of Eustachian tube of one side. 5. Soft 

 palate. 6. Posterior pillar of soft pal;ite. 7. Its 

 anterior pillar ; the tonsil seen situate in the niche 

 between the two pillars. 8. Root of tongue, partly 

 concealed by uvula. 9. Epiglottis, overhanging 

 (10) opening of glottis. 11. Posterior part of larynx. 

 12. Opening into oesophagus. 13. External surface 

 of oesophagus. 14. Trachea. 



Longitudinal Section of CEso- Section of the 

 phagus, near the Pharynx, (Esophagus, 

 seen on its inside. 



a, b. Inter- 

 1, 1. Superior part near pha- nal circular 



rynx. 2,2. Longitudinal folds fibres, c. Ex- 



of its mucous membrane. 3,3. ternal longitu- 



Prominences formed by its mu- dinal fibres. 



ciparous glands. 4,4. Capillary 



bloodvessels. 5. Shows the 



muscular coat after the mucous 



coat has been turned off. 



