98 JouRNAL oF CoMPARATIVE NEUROLOGY. 
considerably larger in size than any neurone from the substantia 
gelatinosa. From an elongated-oval or triangular cell-body, 
three or four dendrites proceed straight outward into the tangle 
of: nerve-fibres and neuroglia. A dendrite is a rather stout pro- 
cess. It has but few branches, and these are of small size. Its 
surface bears scattering gemmules and minute knobs. 
The axone takes its origin directly from the cell-body. It 
runs in a medio-ventral direction. 
Two neurones stained with methylen-blue are represented 
in Fig. 48. These are from the median collection just dorsal 
to the lobus vagi. The nucleus of sucha neurone is propor- 
tionately quite large. It is also eccentric in its position, conse- 
quently cells are often found in which the nucleus appears to 
be in direct contact with the cytoplasmic pellicula at some 
point. The nucleoli are of some prominence. The chromatic 
material is also conspicuous. It is distributed in branching 
strands of some thickness in places, and the several strands 
may have slight connections. 
The cytoplasm is often practically absent at the side of the 
nucleus. The dendrites are so thick, relatively, at their bases 
that the greater part of the cytoplasm appears collected in 
them. The tigroid substance is most abundant in the vicinity 
of the nucleus. The individual masses here are usually irreg- 
ular in form and quite small in size. In the basal parts of the 
dendrites, the tigroid-bodies become elongated. These do not 
reach far along the dendrites, however. 
a. Termination of General Cutaneous Fibres.—The nerve- 
fibres of the general cutaneous system are distributed to the 
skin of the head without the intervention of specialized nerve- 
endings. This sensory system has components in the V, IX, 
and X nerves. There are two principal central stations for these 
fibres: the general cutaneous nucleus, and the dorsal cornu of 
the spinal cord through the medium of the spinal V tract. The 
two termini are really not essentially different, however, since 
the general cutaneous nucleus and the dorsal cornu are morpho- 
logically continuous structures. 
Fibres which have their termination directly in the general 
