The Human Brain During the Third Trimester

Middle

frontal

gyrus

Superior

frontal

gyrus

Superior

frontal

gyrus Nu

cleu

s

acc

um

ben

s

Nu

cleu

s

acc

um

ben

s

Inferior

frontal

gyrus

La

tera

l (^) ve
ntri
cle
La
ter
al
fis
sur
e
T
h
a
la
m
u
s
T
h
a
la
m
u
s
B
a
sa
l
ga
n
gl
ia
B
a
sa
l
ga
n
gl
ia
Clau
strum
Clau
strum
In
sul
argy
rus
In
sul
argy
rus
Choroid
plexus
Choroid
plexus
Third Third ventriclventriclee
TTeemmppoorraal lol lobbee
Occipital
lobe
Occipital
lobe
Corpus
callosum
(rostrum)
Corpus
callosum
(rostrum)
Calcarine
sulcus
Interhemispheric
fissure
Frontal
lobe
Frontal
lobe
Hypo-
thalamus
Hypo-
thalamus
Subc
allosa
l are
a
Subc
allosa
l are
a
Midbrai
n
tectu
m
Midbrai
n
tectu
m
Dark area is an artifact of
mounting medium crystallization
Hippo-
campus
Hippo-
campus
Parahippo-
campal
gyrus
Parahippo-
campal
gyrus
Superior temporal gyrus
Middle temporal gyrus
GW30 Horizontal
CR 260 mm
Y187-65
Level 7: Section 701
Inferior temporal gyrus
G
lo
bu
s
pa
llid
us
G
lo
bu
s
pa
llid
us
Pu
tam
en
Pu
tam
en
In
te
rn
al^
ca
ps
ul
e
In
te
rn
al^
ca
ps
ul
e
Ce
nt
ro

me

di

an

nu

cle

us

Ce

nt

ro

me

di

an

nu

cle

Ven us

tr

al

com

pl

ex

Ve

nt

ral

(^) co
mp
lex
P
sto
rie
ro
oc
m
p
le
x
P
sto
re
io
r
oc
m
p
le
x
Anterior
complex
Anterior
complex Superior
colliculus
Superior
colliculus
Layer I
Cortical plate
White matter
11
22
33
44
55
66
77
88
99
1010
1111
12
16
(^13131414)
1515
Primary visualPrimary visualcortexcortex
CuneusCuneus
Pa rahippocampal neuroepithelium, subventricular
zone, and stratified transitional field
6
2 Fr ontal neuroepithelium and subventricular zone
8 Occipital stratified transitional field
9 Te mporal neuroepithelium and subventricular zone
3 Fr ontal stratified transitional field
1 Rostral migratory stream (source area)
7 Occipital neuroepithelium and subventricular zone
4 Callosal glioepithelium
5 Fo rnical glioepithelium
10 Te mporal stratified transitional field
14 Po sterior striatal neuroepithelium and subventricular zone
11 Alve ar glioepithelium
13 Lateral migratory stream (cortical)
12 Subgranular zone (dentate)
15
Accumbent neuroepithelium and subventricular zone
(infiltrated by the rostral migratory stream)
16 Subpial granular layer (cortical)
Remnants of the germinal matrix, migratory streams, and transitional fields
See detail of brain core
in Plates 136A and B.
Bed nuc.Bed nuc. of stria terminalis of stria terminalis
Damaged areas in section
PLATE 118