NERVUS FACIALIS OF ALBINO MOUSE 111 



In none of the series is there a connection of any sort with the 

 otic ganghon. 



Weigner ('05) mentions an almost constant anastomosis be- 

 tween the Ungual and mandibular nerves in man, the chorda 

 joining the lingual just distal to it. He also describes a com- 

 munication from the great superficial petrosal nerve to the fibers 

 in the facial which form the chorda, and states that there are 

 many scattered ganglion cells along the chorda tympani both 

 before and after its origin from the facial. In the mouse no such 

 communication can be identified. With the exception of one 

 series, in which there is a small ganglion at its place of origin from 

 the facial nerve, no ganglion cells are present in the chorda. 



A. The nerve supply of the tongue and the salivary glands. In 

 one transverse series the nerves in the tongue were carefully fol- 

 lowed. The results of this study will be briefly presented. 



The hypoglossal nerve is composed of fibers of uniform size re- 

 sembling closely those in the motor portion of the facial nerve. 

 Immediately after entering the tongue it divides into two branches 

 which run anteriorly, one close to the septum and the other 

 farther laterally. From these, small branches are given off in 

 all directions, many of which were followed to their termination 

 in motor nerve endings in the muscle fibers of the tongue. 



The glossopharyngeal nerve is composed of fibers of medium 

 and small size resembling those of the lingual nerve. It enters 

 the tongue between the hyoid bone and the thyroid cartilage 

 and passes anteriorly for a short distance along the side of the 

 base of the tongue. In this part of its course there is,' in all my 

 series, a ganglion almost as large as the otic and having the his- 

 tological characteristics of a sympathetic ganglion. Just ante- 

 rior to this ganglion the nerve breaks up into five bundles which 

 enter the tongue and spread out in a fan-shaped manner. 



The most medial of these passes medially and posteriorly and 

 supplies the mucous membrane of the tongue as far as the larynx. 

 The next passes medially and anteriorly and supplies the dorsum 

 of the tongue in the region of the single circum vallate papilla. 

 This branch sends a number of fibers into the base of the papilla, 

 which, together with a similar contribution from the opposite 



THE JOURNAL OF COMPARATIVE NEUROIiOGY, VOL. 30, NO. 1 



