464 J. B. JOHNSTON 
Fig. 54 A section from the same series, farther laterad than the last. This 
section shows a part of the sensory and the motor bundle of the crus, the ol- 
factory projection tract and the median forebrain bundle. It is especially inter- 
esting to note from these sections that both the olfactory projection tract and the 
median forebrain bundle run almost wholly to the tegmental region or farther 
caudad, whereas it has been supposed that they both end for the most part in the 
hypothalamus. 
Fig. 55 <A diagram of the lateral olfactory tract together with a part of the 
medial olfactory tract and of the bundle of the diagonal band. Outline taken 
from figure 5. The figure shows the bundle which bends down behind the striatal 
area to end in the nucleus of the lateral olfactory tract in the amygdaloid emi- 
nence. At ais seenthe bundle which comes from the medial wall of the olfactory 
bulb, crosses over the dorsal surface in the peduncular groove and joins the 
lateral tract. The whole course of the diagonal band can not be seen in this 
lateral view. 
Fig. 56 A diagram of the olfactory tract in ventral view. Outline taken 
from figure 8. The medial and lateral bundles of the olfactory tract are separated 
by the striatal area containing the fibers of the crus. A bundle of the lateral 
tract curves around lateral and caudal to this area to reach the nucleus of the 
lateral olfactory tract, while a bundle of the medial tract passes along the ventral 
border of the striatal area to reach the same nucleus. From this nucleus, then, 
fibers enter the stria medullaris and the bundle of the diagonal band. The 
latter go to the hippocampus by way of the precommissural fornix system. 
