294 



THE RESPIRATOEY SYSTEM 



fice are numerous coarse stiff hairs, vibrissw, connected with which are 

 many sebaceous glands. The vibrissse have no associated arrectores 

 pilorum muscles. Some of the glands also open directly upon the 

 surface of the mucous membrane. 



The fibrous tunica propria of the vestibule is continuous with the 

 corium of the skin, and in it are embedded the deeper portions of the 

 vibrissffi and the secreting portions of the sebaceous glands. By its 

 deeper surface the tunica propria is closely attached to the perichon- 

 drium of those plates of hyaline cartilage which form the septum and 

 alae of the nose. 



THE EESPIRATORY PORTION 



The respiratory portion of the nasal mucous membrane (Schneider- 

 ian membrane) clothes the middle and inferior meatus of the nose. It 

 is continuous anteriorly with the mucous membrane of the vestibule, 



FIG. 281. FROM A SECTION OF THE Mucous MEMBRANE OP THE RESPIRATORY 

 REGION OF THE HUMAN NOSE. 



a-a, ciliated epithelium; b, b, mixed mucoserous glands; c, blood vessel. Hema- 

 tein and Congo red. Photo. X 185. 



