PHYSIOLOGICAL STUDIES OF GUSTATORY MECHANISMS 237 



centimeters in length. The usual course of the chorda tympani nerve in 

 cattle is illustrated in Fig. 3. 



The peripheral distribution of the hngual branch of the mandibular 

 nerve is illustrated in Figs. 1-4. Three branches of this nerve, the branch 

 (or branches) to the isthmus faucium (no. 3, Figs. 1-4), the subungual nerve 



Fig. 2. 



PIG 



Gross dissection left mandibular and left lingual nerves in the pig. 

 For legend see Fig. 1 . 



(no. 5, Figs. 1-4) and the branch which supplies the parasympathetic 

 innervation to the submandibular salivary gland (no. 4, Figs. 1-4) go 

 primarily to structures other than the tongue. Centrally, fibers from these 

 branches leave the lingual and run in the chorda tympani nerve. 



The branch (or branches) to the isthmus faucium divides from the 

 lingual nerve at the rostral border of the medial pterygoid muscle. Some 

 branches go to oral gingiva on the medial surface of the mandible adjacent 

 to the last cheek tooth and others go to the glossopalatine fold and the 

 soft palate. 



The sublingual nerve innervates the oral gingiva on the medial surface 

 of the mandible adjacent to the molar and pre-molar teeth. Rostral 



