REFERENCE LETTERS 
a.p., area parolfactoria 
a.p.a., area perforata anterior 
b.o., bulbus olfactorius 
c.d., commissura anterior 
c.h., commissura hippocampi 
c.7., capsula interna 
ch.op., chiasma opticum 
c.post., commissura posterior 
c.p.a., commissura pallii anterior 
crus, crus cerebri or lateral forebrain 
bundle 
c.st., corpus striatum 
d.b., diagonal band of Broca 
dec.po., decussatio postoptica 
d.v.r., dorsal ventricular ridge 
f.am., fissura amygdaloidea 
fasc.m., fasciculus marginalis 
f.chor., fissura chorioidea 
fi., fimbria 
f-pe., fasciculus praecommissuralis 
f.o., formatio olfactoria 
f-p., fissura prima 
fori., foramen interventriculare 
f.rh., fissura rhinalis 
gl., olfactory glomerulus 
g-.p., general pallium 
gr., granule cells and layer 
g-8., gyrus subcallosus 
h., hippocampus 
hy., hypothalamus 
7.C., islands of Calleja 
l.pyr., lobus pyriformis 
l.t., lamina terminalis 
m.fb.bdl., medial forebrain bundle 
mi., mitral cells and layer 
n.c., nucleus caudatus 
n.d.b., nucleus of the diagonal band 
n.l., nucleus lentiformis 
n.med.a., large-celled medial nucleus 
of the amygdaloid complex 
Fig. 1 Lateral surface of forebrain. 
n.0., nervus olfactorius 
n.o.a., nucleus olfactorius anterior 
n.p.l., nucleus parolfactorius lateralis 
n.p.m., nucleus parolfactorius medi- 
alis 
n.rot., nucleus rotundus 
n.sup., nucleus supraopticus 
i.tr.olf.lat., nucleus of the lateral 
olfactory tract 
olf.proj., olfactory projection tract 
pa., pallium 
pa.th., pallial thickening 
p.c., layer of peripheral cells in the 
pallium 
p.h., primordium hippocampi 
p.o. pedunculus olfactorius 
r.p., recessus praeopticus 
r.m., recessus neuroporicus 
r.s., recessus superior 
s.en., sulcus endorhinalis 
s.f-d., sulcus fimbrio-dentatus 
s.l., sulcus limitans hippocampi 
s.m., stria medullaris 
s.p.a., substantia perforata anterior 
s.t., stria terminalis 
sub., subiculum cornu ammonis 
s.v.d., dorsal ventricular sulcus 
s.v.m., middle ventricular sulcus 
s.v.v., ventral ventricular sulcus 
thal., thalamus 
t.o., tubereulum olfactorium 
t.p., temporal pole 
t., tectum mesencephali 
tr.d.b., tract of the diagonal band 
tr.olf.lat., lateral olfactory tract 
tr.olf., tractus olfactorius 
tr.olf.med., medial olfactory tract 
tr.op., tractus opticus 
v.III., third ventricle 
v.l., ventriculus lateralis 
= 
Chief features described in text. The 
fibers in the striatal area are readily seen both in the fresh brain and in brains 
prepared in bichromate. 
These fibers are equivalent to the mammalian internal 
capsule, but the cortical covering of the insula is wanting. The pyriform lobe 
shows some cross ridges which probably correspond to bundles of internal capsule 
fibers and thickenings of the lateral border of the pallium. 
fissure was especially well developed in this brain. 
The amygdaloid 
The whole brain never shows 
the rostral end of the suleus endorhinalis as well as sections do. 
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