10 INNER VAT10N, [CHAP. XVI. 



be hence deduced for the limitation of the sense of taste to those 

 elementary nerve-fibres going to the tongue which are without the 

 white substance of Schwann. If this be so, the looped tubular 

 fibres are confined to the impressions of touch in that organ. 



We are averse from speculating prematurely on the meaning of 

 anatomical facts, but as some hypothesis will intrude itself, we 

 would venture to hint that this amalgamation of the elements of the 

 peripheral part of the olfactory nervous apparatus in the larger 

 branches, and probably in the most remote distribution, as well as 

 the nucleated character indicative of an essential continuity of tissue 

 with the vesicular matter of the lobe, are in accordance with the 

 oneness of the sensation resulting from simultaneous impressions on 

 different parts of this organ of sense, and seem to show that it would 

 be most correct to speak of the first pair of nerves, as a portion of the 

 nervous centre put forward beyond the cranium, in order that it 

 may there receive, as at first hand, the impressions of which the 

 mind is to become cognizant. No true tubular fibres belong to the 

 olfactory nervous apparatus, except those commissural ones passing 

 between the bulb and certain portions of the cerebrum. 



The branches of the fifth pair given to the nose (figs. 106 and 

 108), are derived from its ophthalmic and superior maxillary di- 

 Fig 108 visions. The nasal twig of the 



former, crossing the orbit, passes 

 over the cribriform plate of the 

 ethmoid bone into the nose, in 

 close contact with a portion of 

 the olfactory nerve, and most 

 probably forms some anasto- 

 mosis with it. Its subsequent 

 course is downwards, subdivid- 

 ing to supply the mucous mem- 

 brane and skin in the neigh- 

 bourhood of the anterior ori- 

 fices. The pungent sensation 

 preceding sneezing seems to be 



Nerves of the septum of the Nose: a. Olfactory r n fP^^4.' f i.- j. 



bulb resting on the cribriform plate, below which ite an attCCtlOn Ol thlS twig, and 



the flow of tears that accom- 

 panies that act is accounted for 

 by the common source of this 



f the Eustachiantube.-From Arnold, one half diam. and of the lachrymal nerve 



The nasal branches of MeckePs ganglion enter the nose through the 

 spheno-palatine foramen, or by pores between this and the pos- 



