896 



NEUROLOGY 



nerve by a branch which may cross the internal maxillary artery. The cnorcla 

 tympani also joins it at an acute angle in this situation. The nerve then, passes 

 between the Pterygoideus internus and the ramus of the mandible, and crosses 

 obliquely to the side of the tongue over the Constrictor pharyngis superior and 

 Styloglossus, and then between the Hyoglossus and deep part of the submaxillary 

 gland ; it finally runs across the duct of the submaxillary gland, and along the tongue 

 to its tip, lying immediately beneath the mucous membrane. 



Its branches of communication are with the facial (through the chorda tympani), 

 the inferior alveolar and hypoglossal nerves, and the submaxillary ganglion. The 

 branches to the submaxillary ganglion are two or three in number; those connected 

 with the hypoglossal nerve form a plexus at the anterior margin of the Hyoglossus. 



SMALL PETROSAL/ 

 OTIC GANGLION /' 



BRANCH TO TEN- 

 SOR PALATI 

 NERVE TO IN- 

 TERNAL PTERY- 

 OOID 



BRANCH FROM 

 QANQLION TO 

 SUBLINQUAL 



GLAND 



NERVE TO 

 INTERNAL 

 CHORDA PTERYGO 

 TYMPANI 

 SYMPATHETIC 



BRANCH TO TEN- 

 SOR TYMPANI 

 BRANCH TO AURIC- 

 ULO-TEMPORAL 

 RANCH TO TEN- 

 SOR PALATI 

 ORDA TYMPANI 

 MIDDLE MENINGEAL 

 ART. WITH SYMPA- 

 THETIC PLEXUS 

 AURICULO-TEM- 

 PORAL 



SMALL PETROSAL 

 BRANCH TO TEN- 

 SOR TYMPANI 

 ITIC GANGLION 



CH TO CHOR- 

 DA TYMPANI 



LOOP BETWEEN 

 L.NQUAL AND 

 HYPOQLOSSAL 



QANQUON 



NERVE TO 

 TENSOR PALATI 



FIG. 782. Mandibular division of trif acial nerve, seen from the middle line. The small figure is an enlarged view of 



the otic ganglion. (Testut.) 



Its branches of distribution supply the sublingual gland, the mucous membrane 

 of the mouth, the gums, and the mucous membrane of the anterior two-thirds of 

 the tongue; the terminal filaments communicate, at the tip of the tongue, with 

 the hypoglossal nerve. 



The Inferior Alveolar Nerve (n. aheolaris inferior; inferior dental nerve) (Fig. 782) is 

 the largest branch of the mandibular nerve. It descends with the inferior alveolar 

 artery, at first beneath the Pterygoideus externus, and then between the spheno- 

 mandibular ligament and the ramus of the mandible to the mandibular foramen. 

 It then passes forward in the mandibular canal, beneath the teeth, as far as the 

 mental foramen, where it divides into two terminal branches, incisive and mental. 



The branches of the inferior alveolar nerve are the mylohyoid, dental, incisive, 

 and mental. 



The mylohyoid nerve (n. mylohyoideus) is derived from the inferior alveolar just 



