RESPIRATION. 



169 



tissue, elevated towards both surfaces in the form of rudimentary papillae, 

 and covered with several layers of squamous epithelium. In it ramify 

 capillary blood-vessels, and in its meshes are a large number of lymphatic 

 channels. Under the mucous membrane, in the less dense fibrous 

 tissue of which it is composed, are a number of tubular glands. The 

 posterior or laryngeal surface of the epiglottis is covered by a mucous 

 membrane, similar in structure to that on the other surface, but its epi- 

 thelial coat is thinner, the number of strata of cells are less, and the 



FIG. 143. 



papillae few and less distinct. The fibrous tissue which constitutes the 

 mucous membrane is in great part of the adenoid variety, and is here 

 and there collected into distinct masses or follicles. The glands of the 

 posterior surface are smaller but more numerous than those of the other 

 surface. In many places the glands which are situated nearest to the 

 perichondrium are directly continuous through apertures in the cartilage 

 with those on the other side, and often the ducts of the glands from one 

 side of the cartilage pass through and open upon the mucous surface of 

 the other side. Taste goblets have been found in the epithelium of the 



