THE NOSE. 



383 



fold or more. In many places the membrana propria is pierced by minute 

 vertical channels, the basal canals, in which connective tissue cells and 

 leucocyctes are found. 



The tunica propria consists of interlacing bundles of fibre-elastic tissue 

 which are most compactly disposed towards the subjacent periosteum. The 



Epithelium 



Glands 





Tu-;ica propria 



FIG. 429. Section of respiratory mucous membrane covering nasal septum. X 75. 



looser superficial stratum is rich in cells and here and there contains aggre- 

 gations of lymphocytes that may be regarded as masses of adenoid tissue. 

 In certain parts of the nasal 

 fossae, the stroma of the 

 mucous membrane contains 

 vascular areas composed of 

 numerous intercommunicat- 

 ing blood-spaces that confer 

 the character of a true caver- 

 nous tissue. These special- 

 ized areas, the corpora caver- 

 nosa, as they are called, are 

 especially well developed over 

 the inferior and the lower 

 margin and posterior extrem- 

 ity of the middle turbinate, 

 much less so over the poste- 

 rior end of the upper turbinate. 

 Where typical, they occupy 

 practically the entire thickness 

 of the mucous membrane from 

 periosteum to epithelium, the interlacunar trabeculae containing the glands 

 and blood-vessels destined for the subepithelial stroma. The blood-sinuses 

 include a superficial reticular zone of smaller spaces and a deeper one of 

 larger lacunae. 



Glands 



FIG. 430. Section of mucous membrane lining maxillary sinus. 

 X 280. (Preparation by Dr. J. P. Tunis.) 



