Till-: i-HAMM. <>i; Wl.THM.ir .V/,7,'1 . 717 



r i if the latter including also Wharton's duct, to enter tho inter- 

 separnting the genio-gloBSUS from the hyo-glossus longus and brevis 

 muscles. From this point it continues to near the froo extremity of the 

 tongue. proceeding in a very nVxuous manner, and giving off, on its course, 

 divisions equally tortuous and which traverse tin- oi-_:an, but without 

 detaching any ramuscules to the lingual muscles; these divisions terminate 

 in the middle and anterior portions of the lingual mucous membrane. 



Before penetrating the mass of the tongue, this nerve furnishes : 1, At, 

 and in front of, the posterior pillars of that organ, some small ramuscules 

 which are sometimes plexiform, and are distributed to tho mucous 

 membrane at the base of the tongue ; 2, Lower, and behind, one or two 

 thin filaments which are carried to Wharton's duct, and ascend with it 

 to the maxillary glaud . 3, A m&{ttNai branch, whose divisions enter the 

 gland of that name, as well as tho mucous membrane covering the sides of 

 tho tongue. 



The gustatory nerve receives, near its origin, the tympano-linijmtl filament 

 or cl< m1ct ti/niptui a branch of the facial nerve sorm to be described. Its 

 terminal divisions mix and anastomose with those of tho great hypoglossal 

 nerve, in the deep muscular interstice which lodges both. 



Physiology teaches us that the gustatory nerve gives to the anterior 

 two-thirds of the lingual mucous membrane ordinary sensation, and, in 

 addition, that special sensibility (or gustatory power) by virtue of which 

 that membrane enjoys the property of appreciating savours. This is its 

 exclusive function. With regard to the tympanic filament from the facial 

 nerve, and which is joined to the gustatory, M. Bernard is of opinion that it 

 participates in the exercise of this sense of taste. Its radiating fibres extend 

 to the submucous muscular layer of which we have spoken, and on which 

 the lingual papilla) rest, and endow it with the property of acting on these 

 papillee by adapting them, we may say, to the sapid substances brought into 

 contact with them. Lussana goes further than this, and, basing his state- 

 ment on observations made on Man and on experiments, asserts that the 

 nerve of the tympanum passes to the mucous membrane, and endows it with 

 the sense of taste. Vulpian, however, does not agree to either of these 

 opinions, because, according to his experience, this nerve does not go to the 

 tongue, but stops at the submaxillary ganglion. 



6. MYLO-HYOID NERVE (Fig. 336, 13). The designation of this nerve 

 indicates its destination and uses. It goes to the muscle bearing its nam<>, 

 and excites its contractility ; it arises opposite to tho preceding, and, like 

 it, descends between tho internal pterygoid muscle and tho inferior max- 

 illary bone, adhering somewhat closely to the latter. But arriving at the 



rior border of the mylo-hyoideus, it passes to the outside of it, and 

 meeting with the sublingual artery, ramifies on the external face of that 

 muscle. 



7. DENTAL BRANCHES (Fig. 336, 12). These are of two orders : some 

 passing to the molar, the others to tho canine and incisor teeth. Their 

 description does not merit any special indication. 



8. MENTAL NERVES, OR TERMINAL BRANCHES or THE INFERIOR MAXILLARY 

 NERVB. Perfectly analogous to the infra-orbital ramusrul* s. tin 



form a fasciculus by diverging and flexuous branches, which leave the 

 mental foramen to be distributed to tho textures of the lower lip, after 

 receiving a branch from tho facial nerve (Fig. 336, 11'). 



D. THE SYMPATHETIC GANGLIA ANNEXED TO TIIK FIFTH PAIR. Those 

 ganglia, joined by filaments of communication to tho anterior extremity 



