THE HEAD AND NECK 



1257 



and inferior conchce, and also on the septum nasi, but over the 

 floor, atrium, and meatus it is comparatively thin. It is freely 

 provided with acinous glands, and contains a certam amount of 

 l\nnphoid tissue. 



The epithelium varies in different regions. In the vestibular 

 region, where the lining membrane is skin, the epithelium is of the 

 stratified squamous variety ; in the respiratory region, as well as m 



-1 Frontal Air-Sinus 



Nasal Bone 



Perpendicular '^ 

 Plate of 

 Ethmoid 



Palatal Process of Palate 

 Bone (in section) 



Cartilage of 

 Aperture 

 Septal Cartilage 



Cartilage of Jacobson 



Fig. 515. 



Palata Process of Superior Majdlla 

 (in section) 



-The Osseous and Cartilaginous Nasal Septum (Right 

 Lateral View). 



the air-sinuses, it is stratified, columnar, ciliated epithelium ; and in 

 the olfactory region it is non-ciliated columnar epithelium. 



Olfactory Mucous Membrane. — In the olfactory region the 

 mucous membrane is thick and pulpy, and has a yellowish-brown 

 colour, due to pigment in the epithelial cells. It contains a copious 

 plexus of olfactory nerve-fibres, and many serous glands, which 

 are known as the glands of Bowman. The epithelium is thick, and, 

 as just stated, is of the non-ciliated columnar variety, its free 

 surface being covered by a delicate limiting membrane. The cells 



