386 



THE SKIN AXD THE SENSE-OEGANS. 



the point where process /3 is attached to this bone. The processes 

 are flat and approach one another obliquely ; in older animals they 

 are united at the point of contact. 



At the junction of the anterior wall, the septum, and the floor is 

 a large aperture in the cartilaginous capsule, through which passes 

 the chief nasal branch of the trigeminus, which supplies numerous 

 branches to the intermaxillary gland. 



c. The glands of the nasal region are Bowman's glands, the in- 

 termaxillary glands (Wiedersheim), the lower nasal gland (Born), 

 the upper nasal gland (Born), the pharyngeal gland (Born), and the 

 lachrymal duct. 



(1) The intermaxillary gland 

 (see p. 280). 



(2) The lower nasal gland is 

 placed along the septum and ex- 

 tends as far back as the posterior 

 nares, opening by its ducts (Figs. 

 238 and 239 gni) into the inferior 

 blind sac of the nasal cavity. In 

 histological structure it corresponds 

 with the intermaxillary glands, 

 except that the glandular tubes 

 are somewhat smaller, and the 

 glandular epithelium stains some- 

 what less easily with carmine 

 (Born). 



(3) The upper nasal gland occu- 

 pies the space between the Conc/ia 

 narium(p*lachrymale t Born) and the 

 neighbouring cartilages, it also sur- 

 rounds the anterior naris and the 

 opening of the lachrymal canal 

 (Figs. 238 and 239 gn%). The 

 numerous ducts open on the mucous 

 membrane covering the oblique car- 

 tilage (above described, as passing 



from in front, downwards and backwards, and forming an incom- 

 plete outer wall of the cavity), and its hinder prolongation. 



(4) The pharyngeal gland is placed transversely behind the pos- 

 terior nares, and surrounds the vomerine teeth. A portion of the 



I. A. Bowman's glands in situ from Rana 



ti'tiijioraria ', after C. K. Hoffmann. 

 Magnified 150 times. 



B. Section of Bowman's gland ; after 

 C. K. Hoffmann. Magnified 300 

 times. 



II. Vessels of nasal mucous membrane of 



Rana etcuknta ; after Langer. Blood- 

 vessels striped, lymphatics shaded. 



