164 J. B. Johnston 
The Glossopharyngeus and Vagus. 
Including the root of the lateral line nerve, seven roots enter 
into these nerves. These will be numbered and described in order 
from before backward. Root / arises in 392 and following sections 
from the acusticum high up on the dorso-lateral surface of the medulla. 
Passing outward, downward and backward it reaches the inner surface 
of the membraneous eranium and in 414 is imbedded in it. It passes 
very obliquely through this membrane, emerging at 434, close above 
root £ but separated from it-by a septum of the eranial membrane. 
In the next following sections root / becomes constrieted into dorsal 
and ventral portions and ganglion cells appear between the two. The 
dorsal part will be called /a, the ventral part /#. The ganglion cells 
rapidly increase in /a (437) and by 446 it appears as a ganglion of 
large cells with few fibers. This is the ganglion of the lateral line 
nerve. In the meantime 7/5 and root Z have united, 7/5 lying lateral 
to 4 (Figs. 6—12). 
At 401 root 2 arises from the spinal Vth tract and reaches the 
cranial membrane close beside root /. Root 3, consisting of faseiculus 
communis and motor components, arises at 409, comes down rapidly 
and passes between two blood vessels by which it is separated from 
roots 2 and Z while in the eranium, joins root 2 in the cranial mem- 
brane and passes promptly through with it, ventral to root / which 
