The Human Brain During the Third Trimester

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GW26 Horizontal


CR 235 mm


Y16-59


Level 7: Section 620


TTeemmppoorraal lol lobbee


Frontal
lobe

Frontal
lobe

Cerebellum
(vermis)

Cerebellum
(vermis)

Cerebellum
(hemisphere)

Cere bellum
(hemisphere )

Cortical plate

Middle
frontal
gyrus

Inferior
frontal
gyrus

Internal capsule (anterior limb)

Lateral
ventricle

Lateral
ventricl e

Stria terminalis

Claustrum

External capsule

Internal capsule (posterior limb)

Choroid
plexus

Choroid
plexus

Cerebral
aqueduct
Cere bral
aqueduct

Lateral fissure

Superior temporal gyrus Middle and inferior temporal gyri

SSuubbccaalllloossaall aarreeaa

White matter

11
22

66


77


14


1515


55


33


44


Interhemispheric fissure

Insular gyrusInsular gyrus

99


1010


1111


1212
1313

88


Caud
ate

Caud
ate
Nu
cleu
s

acc
umb
ens

Nu
cleu
s

acc
umb
ens

BBaassaall ggaanngglliiaa

Pu

ta
m
en

Pu

ta
m
en

Inferior
colliculus

Inferior
colliculus

Corpu
s callo
sum (r
ostrum
)

Corpu
s callo
sum (r
ostrum
)

Parahip-
pocampal
gyrus

Parahip-
pocampal
gyrus

Hippo-
campus

Hippo-
campus

Su

bt
ha

lam

us

Su

bt
ha

lam

us

Ce

re
br
al

pe

du

nc

le

Ce

re
br
al

pe

du

nc

le

Subthalamic
nucleus

Subthalamic
nucleus

Lateral lemniscus

A
nt

er

io
r
co

m

m
iss

ur

e

A
nt

er

io
r
co

m

m
iss

ur

e

Preoptic
area

Preoptic
areaHypothalamusHypothalamus

Third Third ventriclventriclee

Su

bs

ta

nt
ia

in
no

m
in
ata

Su

bs

ta

ntia

in
no

m
in
ata

Red
nucleus

Red
nucleus

Central
gray

Central
gray

Optic tractOptic tract

2 Fr ontal neuroepithelium and subventricular zone


1 Rostral migratory stream (source area)


Pa rahippocampal neuroepithelium, subventricular


(^4) zone, and stratified transitional field
3 Fr ontal stratified transitional field
10 Po sterior striatal neuroepithelium and subventricular zone
Accumbent neuroepithelium (intermingled with the
(^11) rostral migratory stream)
12 Diencephalic (hypothalamic) glioepithelium/ependyma
13 Mesencephalic glioepithelium/ependyma
Alve ar glioepithelium^14 External germinal layer (cerebellar)
7
8 Subgranular zone (dentate)
9 Lateral migratory stream (cortical)
15 Subpial granular layer (cortical)
5 Te mporal neuroepithelium and subventricular zone
6 Te mporal stratified transitional field
Remnants of the germinal matrix, migratory streams, and transitional fields
Layer I
TTe gmentumegmentum TTectuectumm
MidbrainMidbrain
See detail of brain core and
cerebellum in Plates 234A and B.
PLATE 222

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