VESICULAR OR GANGLIONIC NERVE-SUBSTANCE. 
77 
vesicular. These nerve-vesicles, sometimes known as gan¬ 
glion-globules, may be regarded as originally spherical, or 
nearly so, in form (fig. 23, a ); but they often present one or 
more prolonged extensions; and as these when single re¬ 
semble tails, and when multiple are like the rays proceeding 
from a star, the cells are said in the first case to be “caudate,” 
Eig. 23 .—Vesicular Nerve-substance. 
A, combination of Ganglion-cells (of which one is shown separately at a , more highly 
magnified), and Nerve-fibres in the grey substance of the brain, which is also 
traversed by a capillary vessel, b; B B, Ganglionic cells with caudate pro¬ 
longations. 
and in the second to be stellate (b). These prolongations 
have been traced into continuity, in some instances, with the 
axis-cylinders of nerve-tubes, whilst in other cases they seem 
to unite with those proceeding from other vesicles. It is not by 
any means certain, however, that the nerve-tubes thus connect 
themselves with the nerve-vesicles in all instances; since it 
frequently appears as if the former passed in among the 
latter, without coming into direct continuity with them. 
Sometimes a ganglion-cell seems to lie in the course of a 
tubular fibre, which enlarges to envelope it, and then con¬ 
tracts again to its former dimensions. There can be no 
reasonable doubt, however, that in some way or other the 
nerve-fibres and the nerve-vesicles come into some kind of 
communication in the ganglionic centres. The vesicles are 
