and viith nerves, it may be mentioned that the Gasserian 
ganglion is the only one to receive a prominent R. com- 
municans from the sympathetic. There also arises from 
the same ganglion a motor nerve which has traversed the 
ganglion and passes to the M. depressor opereuli 
(m. d. op.). This is the most posterior nerve passing 
through the trigemino-facial foramen. 
The trigemino-facial foramen (represented by a ring 
in the chart) transmits the trigeminal nerve + the dorsal 
lateral line root of the facial + a communis vil. com- 
ponent. The jugular foramen (the posterior ring in the 
chart) transmits the hyomandibular trunk, comprising the 
remainder and greater part of the facial + a cutaneous 
component from the trigeminus. 
The various nerve rami may now be described under 
the names of the nerves to which they belong. 
Nervus Trigeminus—V. 
1. Nervus ophthalmicus profundus (fig. 26, 0. pr.).— 
The root of this nerve (Radix ophthalmici profundi) arises 
on the right side from the root of the trigeminus near the 
brain, and proximal to the Gasserian ganglion. It passes 
downwards and forwards over the inner face of the latter 
ganglion between it and the brain, and enters the pro- 
fundus ganglion, which, though closely opposed to the 
inner face of the Gasserian, is absolutely distinct from it. 
From the profundus ganglion an apparently single nerve 
arises which leaves the skull cavity with the rest of the 
vth and becomes intimately attached to the sympathetic. 
We could not be certain whether a few fibres were not 
given off to accompany the R. ophthalmicus superficialis 
y., thus constituting a Portio ophthalmici profundi. The 
nerve from the profundus ganglion passed with the sym- 
pathetic through the skull wall again by a special small 
