The Human Brain During the Third Trimester

ThalamusThalamus

Claustr

um

Claustr

um

Ins

ulargy

rus

Ins

ulargy

rus

SeptumSeptum

Inte

rna

lca

psu

le(

an

t.)

Inte

rna

lca

psu

le(

an

t.)

Choroid

plexus

Choroid

Intern plexus

alc

ap

sul

e(

po

st.)

Int

ern

alc

ap

sul

e(

po

st.)

Third ventricle

Temporal

lobe

Temporal

lobe

Occipital

lobe

Occipital

lobe

Corpus

callosum

(splenium)

Corpus callosum

(rostrum)

Corpus callosum

(rostrum)

CuneusCuneus

PrPrecuneusecuneus

Calcarine sulcuCalcarine sulcuss

Superior temporal gyrus

Middle and inferior

frontal gyri

Dark area is an artifact of

mounting medium crystallization

Lateral

ventricle

Lateral

ventricle

Lateral

ventricle

Lateral

ventricle

Cin

gul

ate

(^) gy
rus
Cin
gul
ate
(^) gy
rus
Interhemispheric
fissure
Frontal
lobe
Frontal
lobe
Latera
l
fissure
Hippo-
campus
Hippo-
campus
Parahippo-
campal
gyrus
Parahippo-
campal
gyrus
Basal gangliaBasal ganglia
Callosal glioepithelium
GW30 Horizontal
CR 260 mm
Y187-65
Lev el 5: Section 621
Dorsal
complex
Dorsal
complex
Ve
ntr
al (^) c
om
ple
x
Ve
ntr
al (^) c
om
ple
x
P
os
te
ri
or
co
m
p
le
x
P
os
te
ri
or
co
m
p
le
x
Anterior
complex
Anterior
complex
Bed nuc. of stria
terminalis
Bed nuc. of stria
terminalis
HabenulHabenulaa
1
22
3
44
55
66
77
8
9
1010
1111
12
14 15
18 13
1717
16
Pa rahippocampal neuroepithelium, subventricular
zone, and stratified transitional field
6
2 Fr ontal neuroepithelium and subventricular zone
8 Occipital stratified transitional field
9 Pa rietal/temporal 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 Pa rietal/temporal stratified transitional field
13 Po sterior striatal neuroepithelium and subventricular zone
15 Anteromedial striatal neuroepithelium and subventricular zone
14 Anterolateral striatal neuroepithelium and subventricular zone
11 Alve ar glioepithelium
12 Subgranular zone (dentate)
16 Strionuclear neuroepithelium and subventricular zone
17 Septal glioepithelium/ependyma
18 Subpial granular layer (cortical)
Remnants of the germinal matrix, migratory streams, and transitional fields
Layer I
Cortical plate
White matter
Superior
frontal
gyrus
Cingulate gyrus
(retrosplenial area)
CingulumCingulum
Supramarginal and
angular gyri?
Superior
parietal
Parietal lobu le?
lobe
Parietal
lobe
Parieto-occipital
sulcus
Parieto-occipital
sulcus
See detail of brain core
in Plates 134A and B.
Damaged areas in section
PLATE 116
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