16 H. BERKELBACH VAN DER SPRENKEL 
This root, like the sensory VII root, appears to end by three 
branches. <A relatively small number of fibers constitutes the 
dorso-lateral capsule of the glossopharyngeal lobe (fig. 10, d.c.l. LX). 
The other two branches contain respectively finer fibers and 
fibers of a somewhat larger caliber. 
_ The thinnest fibers (fig. 10, s. JX, th.), provided with slender 
myelin sheaths, have the most caudal position in the concavity 
which the root forms while curving around the spinal V tract. 
Entering the communis gray, they terminate in its center and 
in the dorso-medial periphery of the lobus glossopharyngeus. 
The thicker fibers separate from the common sensory stem 
when this has reached the dorsal border of the spinal V tract. 
Instead of running in a dorsal direction as the other fibers do, 
they run mesad (fig. 10, s. LX, th. m.) and—lke the correspond- 
ing fibers of the sensory VII—they cross the bundles of the 
secondary gustatory tract, passing through or beneath the com- 
munis gray. Having reached a more mesial position, they 
successively split up in the communis gray. Some of them, 
~ however, join the descending facial fibers and like them descend 
for a short distance, thus contributing to the formation of the 
prevagal fasciculus solitarius. 
Of the sensory glossopharyngeal fibers mentioned above, those 
which end in the dorsal periphery of the lobus intermingle inti- 
mately with sensory vagus fibers of the same character, which 
proceed a short distance frontally to join this system. From the 
dorso-medial part of the sensory IX lobe secondary gustatory 
fibers also arise (fig. 10) and ascend along the spinal V tract, 
joining the same system from the facial lobe, but not in so large 
numbers as those, the sensory IX lobe being much smaller than 
the sensory VII nucleus because it innervates taste buds of the 
mucous lining of the pharynx and first posthyomandibular gills 
only. 
Descending gustatory fibers are not so easily demonstrated. 
Herrick also mentions that the descending fibers are much less 
conspicuous and that they do not arise from the dorso-medial 
but from the dorso-lateral periphery of the lobe. Apart from this 
system, fibers should. be mentioned which also arise from the lateral] 
