86 J. B. JOHNSTON, 
The glossopharyngeus enters as a single large root which has 
the same disposition in every respect as the vagus roots (Phot. 9). 
The root of the facialis, together with a few cells scattered 
among its fibres, forms the whole of the vagus lobe at its cephalic 
end. The fibres are coarser than those of the IX and X and they 
retain their medullary sheaths for a long distance as they run back- 
ward through the vagus lobe. Sooner or later the fibres lose their 
medullation, divide in Y-shape, and end as do the fibres of the 
vagus and glossopharyngeus chiefly in the median part of the lobe. 
Some of the VII fibres extend caudally beyond the IX. Occasional 
fibres, on the other hand, divide repeatedly soon after entering 
the lobe. 
Cells in lobus vagi. — Scattered throughout the lobe, but 
more numerous in the dorso-median portion among the end-branches 
of the sensory fibres, are cells of Gouat’s II type (Phot. 22, Fig. C). 
These cells measure 10—26 by 32—40 u. 
They have pyramidal or fusiform bodies 
usually with one large and several small 
dendrites. The neurite arises usually from 
the largest dendrite and often at a con- 
siderable distance from the cell body. It 
is in most cases directed toward the central 
or lateral part of the lobe. and, after a 
longer or shorter course, breaks up into 
slender branches which end among the cells 
next to be described. 
Situated chiefly in the lateral and ven- 
tral part of the lobe are cells whose neurites 
leave the lobe and find endings in other 
parts of the medulla or cord (Figs. ac- 
companying Phots. 8, 9, 10). These cells 
Pie ic: which measure 8—16 by 20—32 u, are 
distinctly pyramidal with the chief dendrites 
directed ventro-laterad. The neurites arise from the chief dendrites, 
are coarser than those of the preceding cells, and run ventro-laterad . 
into the lateral tracts of the medulla. Here the fibres either turn 
forward or backward without dividing, or they divide and send one 
branch forward and the other backward. The ascending and de- 
scending fibres form a diffuse bundle ventral to the spinal V tract, 
and somewhat deeper in the medulla. The fibres are non-medullated 
