TRACTUS OLFACTO-TEGMENTALIS 289 
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The bundle described is interpreted as a descending tract 
from the olfactory centers to the motor-correlation centers in the 
tegmentum at the level of the isthmus. Such preparations give 
no direct evidence, of course, as to the actual origin and endings 
of the fibers. At their rostral end the fibers of this bundle are 
indistinguishably intermingled with the fibers of the olfactory 
commissure which we know arise from the olfactory centers. 
At its caudal end the fibers spread widely in the tegmentum. 
This renders it very improbable that the fibers arise in any of 
the sensory nuclei, such as the nucleus of the trigeminus. Its 
behavior rather suggests the breaking up of a bundle at its place 
of ending. 
From the facts just stated the writer can see no reason for 
comparing this with the quinto-frontal bundle described by Wal- 
lenberg. That bundle is supposed by Edinger (Vorlesungen, 
1908) to carry impulses from the sensory nucleus of the trigem- 
