42 Effie A. Eead 



7. The spheno-palatine nerve innervates the mucosa, cephalad of the 

 ethmo-turbinal folds, the maxillary sinus, the lateral wall of the nose 

 and the maxillo-turbinal folds, also the vomeronasal organ. 



8. The vomeronasal organ is a tubular organ found on either side of 

 the septum. It is innervated by olfactory and naso-palatine nerves. 



9. The outer layer of the olfactory bulb is formed from the axones of 

 the olfactory cells. 



10. The glomeruli of the olfactory bulb are formed by the interlacing 

 of the axones of the olfactory cells and the dendrites of the mitral cells. 

 The number of mitral cells represented in a glomerulus varies in different 

 animals. 



MAN. 



11. The olfactory nerves are relatively less in number in man than 

 in the dog and cat. 



12. They are distril^uted to the upper third of the septum and to 

 nearly the whole of the superior concha (Figs. 30, 31). 



13. The nose is innervated by two divisions of the 5th nerve, the 

 anterior ethmoidal which innervates the anterior part of the septum and 

 lateral wall, and a branch is also sent to the skin of the tip of the nose. 



14. The spheno-palatine nerve innervates the lateral wall, the conchte 

 and the ventral part of the septum. 



15. The vomeronasal organ is much less developed in man than in 

 the lower animals. A branch of the olfactory nerve passes to it, at least 

 at the time of birth. 



16. The axones of the olfactory cells form the outer layer of the 

 olfactory bulb. 



Conclusions, 

 dog, cat and man. 



1. The fusiform cells of the olfactory mucosa are true olfactory cells 

 and true nerve cells. They lie in the deeper parts of the epithelium of 

 the olfactory region. 



2. The peripheral process is long and cylindrical and reaches the free 

 surface of the epithelium, passing between the sustentacular cells. It 

 bears the olfactory hairs. 



3. The olfactory fiber is the axone of the olfactory cell; these collect 

 to form olfactory nerve bundles and pass through the cribriform plate 

 to end in the glomeruli of the olfactory bull). These nerve bundles do 

 not anastomose to form a plexus. 



