NERVUS FACIALIS. 465 



between the two pterygoid muscles it receives the chorda tym- 

 pani at a very acute angle. It then passes towards the side of 

 the root of the tongue, deeply concealed by the angle of the 

 lower jaw, and above the submaxillary gland, to which it gives 

 some considerable filaments. Occasionally, however, a "gan- 

 glion, called the maxillary, is formed here by one or more fila- 

 ments of the lingual nerve, and from this ganglion proceed 

 filaments to the submaxillary gland. 



The lingual nerve then proceeds forwards between the my- 

 lo-hyoideus and the hyo-glossus muscle, and between the sub- 

 lingual gland and the latter, having in front of it the excretory 

 duct of the submaxillary gland. It anastomoses frequently 

 with the hypoglossal nerve, sends several filaments to the lining 

 membrane of the mouth, below the tongue, and to the sublin- 

 gual gland. It then divides, or radiates, into seven or eight 

 fasciculi, which run upwards and forwards on the side of the 

 stylo-glossus muscle, and the genio-hyo-glossus, and are finally 

 spent by very fine filaments penetrating into the structure of 

 the papillae, on the upper surface of the tongue. 



The third branch of the trigeminus, according to Dr. Arnold, 

 forms, by several filaments, a ganglion near the foramen ovale. 

 This ganglion is below the spinous process of the sphenoid 

 bone, and sends off several filaments: one contributes to the 

 nervous anastomosis of Jacobson,* which connects the ptery- 

 goid, sympathetic, and glosso-pha^yngeal nerves: another fila 

 ment passes to the tensor tympani, and is distributed upon it. 

 Other filaments join the superficial temporal nerve: that part of 

 it which supplies the membrana tympani. There is also an 

 anastomosis with the portio mollis,t 



SECT. VII. NERVUS FACIALIS, 



The Facial Nerve (JVervus Facialis ; portio dura septimi; par 

 septimitm) having gained the meatus auditorius internus, passes 

 in front of the auditory nerve into the canal of Fallopiu-s, and 

 winding through it, around the tympanum, it emerges at the 



* This nervous anastomosis is described, page 452, article Vidian Nerve, 

 f Am. Med. Jour. vol. v. p. 193. 



