SUBLINGUAL NERVE. 



563 



the animal. Such experiments, taken in connection with the anatomical 

 characters of the nerve, render it almost certain that its root is devoid of 



FIG. 203. Distribution of the subUnyual nerves (Sappey). 



1, root of the fifth nerve ; 2, ganglion of Gasser ; 8, 4, 5, 6, 7, 9, 10, 12, branches and anastomoses of the 

 fifth nerve ; 11, submaxillary ganglion ; 13, anterior belly of the digastric muscle ; 14, section of the 

 mylo-hyoid muscle ; 15, glosso-pharyngeal nerve ; 16, ganglion of Andersch ; 17, 18, branches of the 

 glosso-pharyngeal nerve ; 19, 19, prieumogastric ; 20, 21, ganglia of the pneumogastric ; 22, 22, su- 

 perior laryngeal branch of the pneumogastric ; 23. spinal accessory nerve ; 24, sublingual nerve ; 

 25, descendens noni ; 26. thyro-hyoid branch ; 27, terminal branches ; 28, two branches, one to the 

 genio-hyo-glossus and the other to the genio-hyoid muscle. 



sensibility at its origin. All modern experimenters have confirmed the 

 observations of Mayo and of Magendie, with regard to the sensibility of the 

 sublingual after it has passed out of the cranial cavity. The anastomoses of 

 this nerve with the upper two cervical nerves, with the pneumogastric, and 

 with the lingual branch of the fifth, afford a ready explanation of this fact. 



The sublingual may be easily exposed in the dog by making an incision 

 just below the border of the lower jaw, dissecting down to the carotid artery 

 and following the vessel upward until the nerve is seen as it crosses its course. 

 On applying a feeble Faradic current at this point, there are evidences of 

 sensibility, and the tongue is moved at each stimulation. 



The phenomena following section of both sublingual nerves point directly 

 to their uses. The most notable fact observed after this operation is that 

 the movements of the tongue are entirely lost, while general sensibility and 

 the sense of taste are not affected. The phenomena which follow division of 

 these nerves consist simply in loss of power over the tongue, with considera- 

 ble difficulty in deglutition. 



