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consists very largely of communis fibres from the Lobus 
vagi, but also contains motor and cutaneous components. 
In its intracranial course it is almost entirely covered by 
the root of the lateralis, and before it reaches its foramen 
in the skull, and whilst passing through it proximally, it 
bears a smallish ganglion distinctly separated from the 
other vagus ganglia. This is the jugular ganglion (Jug. g.), 
also found by Herrick in Gadus and Menidia. It is the 
ganglion of the cutaneous fibres of the vagus, and forms 
typically the R. cutaneus dorsalis vagi, and the R. oper- 
cularis vagi. 
R. opercularis vagi (7. op. wv.).—This is given off 
directly the vagus leaves the skull, and at its origin is 
very closely opposed to the base of the R. supratemporalis 
vagi (see chart), but it does not fuse peripherally with it, 
as in Gadus according to Herrick. It passes forwards, 
and divides into antero-dorsal and postero-ventral branches 
supplying the skin of the opercular and supra-opercular 
regions. It contains both light and heavily myelinated 
fibres. After giving off this ramus, the vagus swells into 
the large ganglionic complex (g. «. 2-5), of which only the 
first ganglion (g. v. 1) is completely distinct. 
1.—Truncus branchialis primus Vagi (¢. a. 1). 
Arises from the dorsal aspect of the vagus on 
its inner surface. It passes inwards and backwards 
towards the first spinal sympathetic ganglion, to which 
it becomes closely opposed. It then bends forwards 
and downwards, and at once swells into its large 
ganglion (g. 2. 1), which is quite distinct from the other 
vagus ganglia, as is general among Teleosts. The motor 
component of the truncus passes over the external surface 
of the ganglion. Distal to the latter the truncus passes 
downwards and forwards and divides into an upper pre- 
