296 



THE RESPIRATORY SYSTEM 



olfactory cells. The nervus terminalis contains some medullated fibers, 

 and may contain both afferent and efferent components (Johnston). In 

 the rabbit it innervates in addition to Jacobsou's organ, also a wide 

 area of the nasal septum (Huber and Guild). 



THE OLFACTORY PORTION 



The olfactory portion of the nasal mucous membrane, the olfactory 

 organ, lines the superior meatus, a portion of the superior turbinate 

 bone and a corresponding portion of the median septum, and its 

 irregular border here and there invades the upper portion of the middle 

 meatus. It consists of a fibrous tunica propria and a clothing of 



FIG. 282. THE OLFACTORY MUCOSA OF A CAT. 



a, epithelium; b, basement membrane; c, corium; d, cuticle; e, sustentacular cell 

 layer;/, olfactory cell layer; g, basal cells; h, blood-vessel; i, a tubule of Bowman's 

 glands; k, bone. Hematein and picrofuchsin. Photo. X 270. 



nemo-epithelium. The tunica propria contains elastic as well as col- 

 lagenous fibers, and many small tubulo-acinar serous glands, the olfac- 

 tory glands of Bowman. Beneath the epithelium is an indistinct base- 

 ment membrane. 



