DISSECTING MANUAL. 



between the Mylo-hyoid and Hyoglossus, but under Wharton's 

 duct, to the side of the tongue. It communicates with the 

 hypoglossal, while the chorda tympani of the facial joins it 

 under the External pterygoid. It supplies the mucous mem- 

 brane on the outer wall and floor of the mouth and the anterior 

 two-thirds of the side and dorsum of the tongue. [684] 



The inferior dental runs between the internal lateral liga- 

 ment and ramus of the mandible, and then through the in- 

 ferior dental foramen and canal, where it supplies the molars, 

 and divides into two branches, mental and incisor. The in- 

 cisor branch supplies the canine and incisors. The mental 

 branch runs through the mental foramen to the skin on the 

 chin and lower lip, communicating with the facial. A mylo- 

 hyoid branch arises before the nerve enters the inferior dental 

 foramen; it descends in a groove on the ramus of the lower 

 jaw to enter the superficial surface of the Mylo-hyoid and also 

 supply the anterior belly of the Digastric. [685] 



Submaxillary Ganglion. This lies on the Hyo-glossus, just 

 under the lingual nerve, and is reddish and very small. Roots : 

 The afferent root comes from the lingual ; and the efferent from 

 the fibres of the chorda tympani in the lingual. The sympa- 

 thetic root comes from the plexus on the facial. Branches: 

 These supply the submaxillary gland and duct, and also (by 

 fibres which rejoin the lingual) the sublingual gland. [685] 



Otic Ganglion. This lies under the inferior maxillary nerve, 

 just below the foramen ovale. Roots : The motor comes from 

 the (inferior maxillary) nerve to the Internal pterygoid; and 

 the sympathetic from the plexus on the middle meningeal 

 artery. The sensory is the small superficial petrosal nerve 

 from the tympanic plexus (facial and glosso-pharyngeal) . 

 Branches : These go to (motor) the Tensor tympani and Ten- 

 sor palati; and to (communicating) the Vidian, chorda tym- 

 pani, and roots of the auriculo-temporal. [685] 



Facial. After traversing the internal auditory meatus, 

 where the pars intermedia sends branches to it and also to the 



[72] 



