THE OLFACTORY NERVE. 



1221 



the mesial surface of the superior turbinate bone and a somewhat larger field on 

 the adjacent upper part of the nasal septum. The olfactory nerves (Fig. 1048), 



FIG. 1047. 



Olfactory bulb 



Nasal nerve, ext. br, 



Exit ext. br. nasal nerve 



Olfactory nerve-fibres 



An upper ant. nasal br. 

 'Meckel's ganglion 



) Upper post, nasal brs. 

 j Meckel's ganglion 



Naso-palatine nerve 



(Sup. ant. nasal br. of 

 Meckel's gangl. and 

 inf. ant. nasal br. of 

 ant. descending 

 palatine nerve 

 A posterior nasal br. 

 Meckel's ganglion 



Ant. descending palatine nerve, the middle palatine appearing posteriorly 



Right nasal fossa showing distribution of olfactory and nasal nerves on lateral wall ; mucous membrane has 



been partly removed to expose nerves. 



whose fibres are nonmedullated, exhibit a plexiform arrangement within the deeper 

 part of the nasal mucous membrane, pass upward through the cribriform plate of 



FIG. 1048. 



Crista galli 



Nasal nerve 



Ext. br. nasal nerve, cut J 



Int. (septal) br. of nasal nerve 

 Olfactory bulb 



Naso-palatine nerve 



Olfactory nerve-fibres 

 Sphenoidal sinus 



An upper ant. nasal br. of 

 Meckel's ganglion 

 Naso-palatine nerve 



An upper ant. nasal br. 

 'of Meckel's ganglion 



Eustachian orifice 



Vomer, posterior border 



Soft palate, cut mesially 



Right nasal fossa showing distribution of olfactory and nasal nerves on septal wall ; mucous membrane has 



been partly removed to expose nerves. 



the ethmoid bone and enter the under surface of the olfactory bulb. Within the 

 latter the nerve-fibres end in terminal arborizations in relation with the dendritic 

 processes of the mitral cells (Fig. 995), sharing in the production of the peculiar 

 olfactory glomemli. 



