THE NERVES. 391 



its internal side to the border of the tongue, and between m. mylo- 

 and genio-glossus into the substance of the tongue ; it lies above 

 n. hypoglossus, and terminates in tufts upon the mucous membrane 

 and the papillae at the borders and the tip of the tongue. Between 

 the mm. pterygoidei it receives the chorda tympani, which blends 

 with it behind at an acute angle ; farther a connecting branch 

 from n. alveolaris inferior. It gives branches to the tonsilla, the 

 mucous membrane of the cheeks, and the gums ; from its inferior 

 surface filaments pass to the ganglion linguale ; lastly, also, to 

 the gland, sublingualis, and there forms a pi. sublingualis. 



Ganglion glotticum s. linguale s. maxillare. The lingual 

 ganglion is placed in the curve of n. lingualis between it and the 

 gland sub-maxillaris, at the side of the root of the tongue, oppo- 

 site the last molar tooth, covered by the mucous membrane. Its 

 three roots are received ; 1 . from the chorda tympani of n. foci- 

 alis (motor) ; 2. from nerv. lingualis (sensitive) ; 3. from the 

 first cervical ganglion of n. sympathicus. From it branches pass 

 off; 1. to the ductus Whartonianus (for the excretion of saliva 

 in the act of tasting) ; 2. to the n. lingualis (as from gangl. oil- 

 cum to the auricularis from g. ophthalmicum to the n. opticus) 

 of hypoglossus. 



4. Nervi masticatorii, the three branches, contain the fibres of 

 the portio minor n. trigemini. They are : 



1. N. mylo-hyoideus passes downwards in a sheath, with nerv. 

 alveolaris inferior as far as foram. alveolare poster., then in 

 the sukus mylo-hyoid. of the lower jaw, and ramifies in m. 

 mylo-hyoideus, and the anterior belly of m. biventer (the 

 posterior belly of which is supplied by n.facialis). 



2. N. massetericus inclines backwards and over incisura semi- 

 lunaris outwards, and sinks into m. masseter. Above, a 

 deeper branch goes to the temporal fossa and to the maxillary 

 articulation. 



3. N. temporalis profundus, frequently double, passes upwards 

 close to the wall of the temporal fossse, anastomosing with 

 branches of masseteric., buccinator., and temporalis super- 

 ficialis ; with lacrymalis and subcutaneus, and loses itself 



in the muse, temporalis. 



4. TV. buccinatorius, a larger branch, penetrates the m. ptery- 

 goid. extern., gives temporal twigs, passes downwards be- 

 tween m. pterygoid. ext. and temporal., behind proc. coronoid. 

 to m. buccinator, anastomosing behind duct. Stenonianus in 

 a curve with nerv.facialis, and giving branches to the muscles 

 of the angles of the mouth. 



