The Human Brain During the Third Trimester

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ThalamusThalamus


B


as


al


ga


ng


lia


B


as


al


ga


ng


lia


Cla
ustr
um
Cla
ustr
Insu um

largy
rus
Ins
ular
gyrus

ChorChoroid plexusoid plexus

Third ventricle

Hippo-
campus

Hippo-
campus

TTeemmppoorraal lol lobbee


Occipital
lobe

Occipital
lobe

Pineal gland

Parieto-occipital
sulcus

Calcarine
sulcus

Calcarine
sulcus

Middle frontal
gyrus

Inferior frontal
gyrus

Interhemispheric
fissure

Frontal
lobe

Frontal
lobe

La
ter
al

fis
sur
e

Subc HypothalamusHypothalamus
allosa

l (^) area
Subca
llosal
area
Superior temporal gyrus
Middle temporal gyrus
Inferior temporal gyrus
Late
ral v
entric
le
Primary visualPrimary visualcortexcortex
Parahippo-
campal
gyrus
Parahippo-
campal
gyrus
Bed nuc.Bed nuc. of stria terminalis of stria terminalis
Nucleus
accumbens
Nucleus
accumbens
GW30 Horizontal
CR 260 mm
Y187-65
Level 6: Section 671
Layer I
Cortical plate
White matter
11
22
33
44
55
66 77
88
9
1010
1111
12
17
13 1414
1616
1515
C
en
tro






m
ed
ian
nu
cle
us

C
en
tro





m
ed
ian
nu
cle
us
Ve
ntr
al
com
ple
x

Ve
ntr
al
com
ple
x

P
sto
re
io
r

oc
m
lep
x

P
sto
re
io
r

oc
m
lep
x

Anterior
complex

Anterior
complex

Pr
e-
tectumPr
e-
tectum

Corpus callosum
(rostrum)

Corpus callosum
(rostrum)

Superior
frontal
gyrus

Pa rahippocampal neuroepithelium, subventricular


(^6) zone, and stratified transitional field
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
15
Anterolateral striatal neuroepithelium and subventricular
zone (infiltrated by the rostral migratory stream)
11 Alve ar glioepithelium
13 Lateral migratory stream (cortical)
12 Subgranular zone (dentate)
16
Accumbent neuroepithelium and subventricular zone
(infiltrated by the rostral migratory stream)
17 Subpial granular layer (cortical)
Remnants of the germinal matrix, migratory streams, and transitional fields
Pre CuneusCuneus
cu
ne
us
Pr
ec
un
eu
s
Globus
pallidus
Globus
pallidus
PutamenPutamen
See detail of brain core
in Plates 135A and B.
PLATE 117

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