12 F. L. LANDACRE 
The dorso-lateral VII 
This ganglion (figs. 1, 8, 9) is an elongated rod-like mass 
occupying a position at the side of the anterior end of the 
medulla on a level with the floor of the medulla and between 
it and the epidermis. Its anterior end reaches as far forward 
as the root of the Gasserian, being situated of course more 
laterally, and its posterior end reaches posterior to the anterior 
end of the auditory vesicle and lies between the auditory 
vesicle and the medulla. The anterior end of the ganglion lies 
near the skin, while the posterior end lies near the cord, so that 
on a frontal section, it has a position diagonal to the longitudinal 
axis of the body. Its root enters the medulla along with the 
roots of the geniculate and ventro-lateral ganglion. It main- 
tains about the same level dorso-ventrally throughout its course 
lying parallel with the long axis of the body. The posterior end 
of the ganglion comes into close contact with the posterior end 
of the geniculate and the anterior end of the auditory, the root 
fibers passing dorsally from the cells along the anterior end of 
the auditory ganglion. 
There are three fibrillated nerves arising from this ganglion 
at this stage; a supra-orbital ramus, an infra-orbital ramus, 
and the ramus oticus. The first two arise from the anterior end 
of the ganglion and shortly beyond their origin from the ganglion 
come closely into contact with the skin, where they innervate 
lateral line organs anterior to the position of the ganglion. 
Neither of these rami comes into close relation with the corre- 
sponding rami of the Gasserian, so that we do not have true 
supra-orbital and infra-orbital trunks at this time. The supra- 
orbital ramus (lateralis portion of ramus ophthalmicus super- 
ficialis VII, figs. 4 to 7) arises from the dorsal portion of the ante- 
rior end of the ganglion, pursues a course diagonally forward and 
upward innervating lateral line organs of the supra-orbital line. 
It arches over the optic vesicle and can be traced with certainty 
as a fibrillated root to the anterior end of the optic vesicle. It 
always occupies a position quite close to the epidermis. 
