374 THE NERVE SYSTEM 



crosses the sphenomaxillary fossa, and, as the infra- 

 orbital, traverses the canal, emerges from the foramen 

 to end on the face in .the palpebral, nasal, and labial 

 branches the first set, to lower lid; the second, to 

 side of nose; and the third, to upper lip. 



The orbital or temporomalar branch enters the orbit 

 by the sphenomaxillary fissure, and divides into two 

 branches, which pierce the malar bone. 



The alveolar or superior dental nerves are three: 

 The posterior, middle, and anterior, which supply the 

 upper row of teeth. 



The inferior maxillary nerve (third division of the 

 fifth) is the largest branch, and arises by two roots 

 a large sensor root from the Gasserian ganglion and 

 the motor root of the fifth. This nerve divides into 

 two trunks, anterior and posterior. The anterior gives 

 off the masseteric, the buccal, the deep temporal, and 

 the two pterygoid nerves. 



The posterior trunk of the inferior maxillary is 

 mostly sensory. It divides into the auriculotemporal, 

 gustatory, and inferior dental; the last supplies the 

 low^er row of teeth. 



The gustatory or lingual nerve lies at first beneath 

 the external pterygoid, internal to the dental nerve. 

 Here a branch from the dental may cross the internal 

 maxillary to join it. The chorda tympani also 

 joins it. 



The nerve now runs along the inner side of the 

 ramus of the jaw, and crosses the upper constrictor to 

 the side of the tongue above the deep part of the 

 submaxillary gland; lastly, it runs below Wharton's 

 duct, and superficially along the side of the tongue to 

 its apex. It communicates with the facial through 

 the chorda tympani, the submaxillary ganglion, 

 inferior dental, and hypoglossal. It supplies the 

 mucous membrane of the mouth and tongue (anterior 

 two-thirds), the gums, sublingual gland, and the 



