2/2 Journal of Comparative Neurology. 



infra-orbital trunk closely wedged in between the sympathetic 

 ganglion and the VI nerve. Closely associated with the pala- 

 tine at its origin is a large bundle of communis fibers which 

 joins the r. maxillaris V intra-cranially and another which joins 

 the r. mandibularis V. The other communis fibers pass ven- 

 trally to go out through the foramen between the exits of the 

 truncus hyomandibularis and the infra-orbital trunk. The space 

 between these trunks in the foramen and just external to it is 

 occupied by the first sympathetic ganglion of the "head par£" 

 of the sympathetic chain. All of these communis fibers, there- 

 fore, have to pass either through or close around this large 

 sympathetic ganglion in passing out of the cranium. They 

 also pass out very closely joined to the motor fibers of the r, 

 opercularis profundus VII for the mm. adductor arcus palati- 

 nus and adductor hyomandibularis (Figs. 6, 7). A short dis- 

 tance beyond the foramen they separate into the r. pre-trema- 

 ticus VII and the Jacobson's anastomosis. 



./. TJie Tngoninus Roots. 



The intra-cerebral and root portions of this nerve are, so 

 far as observed, exactly as in Menidia. The ganglion, how- 

 ever, is much less distinct, and crowded back farther toward 

 the brain and squeezed in among the other roots. It is largely 

 intra-cranial, but a considerable proportion of it lies in the fora- 

 men or just outside. As the root is followed outward cells of 

 the Gasserian ganglion appear first on the lateral and ventral 

 side of the root (Fig. 6). These lie close to those of the geni- 

 culate ganglion, but farther laterally and dorsally, as well as 

 farther cephalad, and in favorable preparations there is no diffi- 

 culty in distinguishing the boundaries of the two ganglia. If, 

 however, the sections were not in every way favorable, it would 

 probably be by no means easy to distinguish them, for their 

 cells are of almost the same size and they are separated by 

 only a narrow zone of fibers. 



These cells are closely crowded in between the trigeminus 

 root and the ventral lateralis root as it curves back into the 

 hyomandibular trunk. A little farther forward the ganglion 



