1 30 STRONG. [Vol. X. 



this bundle represents the fasciculus communis component. 

 When it separates from the R. hyomandibularis it is the 

 R. mandibularis internus facialis. This nerve now proceeds 

 cephalad and bends mesad under the quadrate (310 ±) to the 

 angle of the pharynx. It proceeds cephalad along the pharynx, 

 supplying some fibres to its mucous membrane. Its main dis- 

 tribution is not general, however, but is principally to one 

 locality. This is shown in PI. VIII, Fig. 11. A great number 

 of the fibres are here seen to supply a large papilla or eleva- 

 tion of the epithelium about at the boundary between the 

 pharynx and mouth. A number of fibres proceed mesad to 

 innervate the floor of the pharyngo-oral cavity. This is in the 

 same transverse plane as the location of the future tongue, as 

 is shown by the N. hypoglossus and R. lingualis glossopharyn- 

 gaei. I have examined sections of the frog also, with reference 

 to this point, and find that the termination of this nerve, the 

 R. mandibularis internus facialis, is in the region of the 

 anterior part of the attachment of the tongue, and that a part 

 of it, at least, seems to send branches into the anterior part of 

 the tongue itself. 



It may be well to point out here that these observations 

 confirm, in most respects, what would be considered a priori 

 as the most probable destinations of these components. As 

 the dorsal division of the dorsal VII (VII b) was found to 

 supply sense organs of the lateral line system, a similar destina- 

 tion would be the natural supposition respecting the distribution 

 of that ventral portion going over into the R. hyomandibularis. 

 Again, as one portion of the fasciculus communis component 

 (VII aa) was found to be distributed, as the R. palatinus VII, 

 to the roof of the pharynx, it is most consistent that the 

 portion entering the R. hyomandibularis should likewise supply 

 a portion of the pharynx. By elimination merely, this would 

 leave the third component, i.e., the motor root (VII ah), and 

 also the R. communicans IX ad VII to supply the general 

 cutaneous {i.e.^ cutaneous excluding the specialized lateral line 

 system) and motor branches. VII ab has the position and 

 characteristics of a motor root, and is the one which would be 

 considered most likely to enter the motor branches. In this 



