NOSE 



483 



perforated with small holes. Lymphocytes are present in variable quan- 

 tity, sometimes forming solitary nodules and often entering the epithelium 

 in great numbers. Branched alveolo-tubular mixed glands extend into 

 the tunica propria. Their serous portions have intercellular secretory 

 capillaries, and both mucous and serous cells contain a trophospongium. 

 The glands often empty into funnel-shaped depressions, which are macro- 

 scopic on the inferior concha, and are lined with the superficial epithelium. 



Epithelium 



Bone. 



FIG. 489. VERTICAL SECTION THROUGH THE MUCOSA OF THE INFERIOR CONCHA OF MAN. X 48. On 

 the left is a funnel-shaped depression receiving an excretory duct; near-by on the right is the section 

 of a large vein. 



The mucosa of the several paranasal sinuses is thin ( o.o2mm.), with 

 less elastic tissue and but few small glands. A pocket which extends 

 into the lower part of the median septum has already been described 

 as the vomero-nasal organ (Jacobson's organ). In man it is the rudimen- 

 tary remnant of an important sense organ, supplied by special branches 

 of the olfactory nerves and by the nervus terminalis (cf. p. 141). It 

 is lined with a tall columnar epithelium, and contains, at least in the 



