244 Cc. JUDSON HERRICK 
area, the ventrolateral nucleus, is clearly dominated by the lateral 
forebrain bundle, whose fibers spread freely throughout its 
stratum album, as well as dorsally into the the overlying dorso- 
lateral area (figs. 24 to 29, 37). Toward the rostral end of the 
ventrolateral area these fibers tend to lie deeper than those of 
the olfactory tract, though the terminals of the two systems are 
freely mingled. . 
gl. ol 
q. C 
Mm. c 
val 
oom septum 
trol.c.s. 
Deaveliite 
nue, v. I. 
ay serial kes Get 
latest, 
p.v. th. 
ne Chak 
flats t 
v. 3. 
Fig. 24 Horizontal section through the brain of adult Amblystoma tigri- 
num. Weigert method. X17. The section is inclined so that the left side is 
farther ventral. It passes through the ventral border of the interventricular 
foramen and ventrally of the accessory olfactory bulb. On the left side unmye- 
linated fibers of the dorsal olfactory projection tract (d.ol.p.tr.) are demon- 
strated by the ‘brown reaction,’ embedded within the lateral forebrain bundle. 
In neighboring sections these fascicles can be followed forward to their rami- 
fication within the ventrolateral nucleus. On the right side the unmyelinated 
thalamo-frontal tract (tr.th.f.) is seen immediately dorsally of its entrance into 
the lateral forebrain bundle. Its fascicles can be followed forward to ramify 
within the ventrolateral nucleus, in general dorsally of those of the olfactory 
projection tract. 
