Herrick, Cranial Nerves of the Cod Fish. 271 



fasciculi of the two sides run back as close to the median line 

 as possible, practically in contact with eachother under the 

 fused tubercula acustica and immediately over the fourth ventri- 

 cle, whose lumen is constricted in this region to a very narrow 

 tube. The glossopharyngeus does not enter the fasciculus com- 

 munis, but its sensory fibers enter the lobus vagi in intimate 

 relations with those of the vagus. 



The origin of the communis root from the oblongata has 

 already been described. It is at once crowded ventrally be- 

 tween the brain and the lateral line and motor VII roots. The 

 most dorsal fibers of the communis root run forward after the 

 separation of the dorsal and ventral lateralis roots in the notch 

 between these roots (Fig. 3) lying laterally of the trigeminus root. 

 From this point a continuous band of communis fibers runs 

 down the inner face of the ventral lateralis root and in this latter 

 region the cells of the facial (geniculate) ganglion first appear. 



This ganglion is large and wholly intra-cranial, occupying 

 the space ventrally and mesially of the ventral lateralis root. 

 Farther cephalad some cells of this ganglion are wedged in 

 between the ventral lateralis and motor VII roots ventrally and 

 the V and dorsal lateralis roots dorsally (Fig. 4). From the 

 latter cells the third rootlet of the facial root of the r. later- 

 alis accessorius arises, as described below. 



The geniculate ganglion terminates in front rather abruptly. 

 A narrow tongue of cells runs farther forward dorsally and 

 from this the very slender communis component in the supra- 

 orbital trunk arises. Ventrally the ganglion is produced into 

 the bundle of communis roots which leave the complex in con- 

 nection with the infra-orbital trunk or behind it. Tliis bundle 

 includes all the communis nerves of the facialis except the roots 

 of the r. lateralis accessorius and the fibers for the supra-orbital 

 trunk. It runs forward under the infra-orbital trunk and the 

 big blood vessel lying internally of the latter (orbital vein), over 

 the first sympathetic ganglion and externally of the VI nerve 

 (Fig. 7). 



The palatine nerve separates from the mesal side of this 

 bundle and emerges from the cranium farther forward with the 



