The Human Brain During the Third Trimester

Frontal neuro-

epithelium and

subventricular zone

Fr ontal neuro-

epithelium and

subventricular zone

Fr ontal stratified

transitional field

Callosal glioepitheliuCallosal glioepitheliumm

Strionuclear

glioepithelium

Strionuclear

glioepithelium

Fornical

glioepithelium

Fo rnical

glioepithelium

Fornical

glioepithelium

Fo rnical

glioepithelium

Po sterior striatal neuroepithelium

and subventricular zone Pa rietal/temporal neuroepithelium

and subventricular zone

Pa rietal/temporal

stratified transitional field

Visual radiation

Callosal glioepitheliuCallosal glioepitheliumm

GlioepitheliuGlioepitheliumm

GlioepitheliuGlioepitheliumm

Germinal and transitional structures in italics

Frontal

lobe

Frontal

lobe

Poste

rior

limb

Poste

rior

limb

An

ter

ior

(^) lim
b
An
ter
ior
(^) lim
b
In
te
rn
al
c
a
ps
ul
e
In
te
rn
al
c
a
ps
ul
e
L
at
er
al
(^) v
en
tr
ic
le
L
at
er
al
(^) v
en
tr
ic
le
Lateral
ventricle
Lateral
ventricle
Co
rp
us
(^) c
al
lo
su
m
Co
rp
us
(^) c
al
lo
su
m
C
or
pu
s^
ca
llo
su
m
C
or
pu
s^
ca
llo
su
m
Fo
ra
m
en
o
f
M
on
ro
G
lo
bu
s^ p
allid
us
G
lo
bu
s^ p
allid
us
FFornixornix
For
nix
Fo
rnix
Fimbria/
fornix
Fimbria/
fornix
Cave of the
septum
Ex
tern
al^ c
aps
ule
Ex
tern
al^ c
aps
ule
Caudate
(head)
Caudate
(head)
La
ter
al
se
pta
l^ n
uc
leu
s
La
ter
al
se
pta
l^ n
uc
leu
s
TTriangular septal nucleuriangular septal nucleuss
Caudate
(tail)
Caudate
(tail)
C
o
r
p
u
s
c
a
ll
o
s
u
m
(g
e
n
u
)
C
o
r
p
u
s
c
a
ll
o
s
u
m
(g
e
n
u
)
C
o
r
p
u
s
c
a
ll
o
s
u
m
(g
e
n
u
)
C
o
r
p
u
s
c
a
ll
o
s
u
m
(g
e
n
u
)
Cingulate gyrus
(retrosplenial area)
Cingulate gyrus
(retro splenial area)
CingulumCingulum CingulumCingulum
Cingulate gyruCingulate gyruss
Induseum
griseum
Induseum
griseum
Induseum
griseum?
Interhemispheric fissure
Interhemispheric fissure
Dorsomedial
nucleus
Dorsomedial
nucleus
Ve
ntr
al
lat
era
l
nu
cle
us
Ve
ntr
al
lat
era
l
nu
cle
us
V
en
tr
al
a
n
te
r
io
r
n
u
c
le
u
s
V
en
tr
al
a
n
te
r
io
r
n
u
c
le
u
s
Ventral
posterolateral
nucleus
Ventral
posterolateral
nucleus
PulvinarPulvinar
Habenular
nuclei
Stria
medullaris
Stria
terminalis
Stria
terminalis
Stria
terminalis
Stria
medullaris
Subfornical orga n
R
e
t
i
c
u
l
a
r
n
u
c
l
e
u
s
R
e
t
i
c
u
l
a
r
n
u
c
l
e
u
s
CCllaauussttrruumm
PutamenPutamen
Ins
ula
r^ g
yr
us
Ins
ula
r^ g
yr
us
Choroid
plexus
Chor oid
plexus
DORSAL
COMPLEX
DORSAL
COMPLEX
PO
ST
E
R
IO
R
C
O
M
PL
E
X
PO
ST
E
R
IO
R
C
O
M
PL
E
X
C
E
N
T
R
A
L
C
O
M
PL
EX
C
E
N
T
R
A
L
C
O
M
PL
R EX
E
T
IC
U
L
A
R
BE
LT

R

E

T

IC

U

L

A

R

BE

LT

VENTRAL COMPLEXVENTRAL COMPLEX

Ce

nt

ra

ll

ate

ral

nuc

leus

Ce

nt

ra

ll

ate

ral

nuc

leus

PE

RI

VENTRICULARCOMPLEX

PE

RI

VENTRICULARCOMPLEX

Periven

tricularnuclei

Periven

tricularnuclei

Third ventricle

Fo

ra

m

en

o

f

M

on

ro

Antero-

medial

nucleus

Antero-

medial

nucleus

ANTERIOR

COMPLEX

ANTERIOR

COMPLEX

B

ASAL GANGLI

A

B

ASAL GANGLI

A

SEPTUMSEPTUM

THALAMUSTHALAMUS

DORSAL

HIPPOCAMPUS

DORSAL

HIPPOCAMPUS

Lateral fissure

Lateral fissure

Stem cells of

choroid plexus

Stem cells of

choroid plexus

Stem cells of

choroid plexus

Stem cells of

choroid plexus

C

or

pus callosu

m

(splenium

)

C

orpus callosu

m

(splenium

)

Paracentral

lobule

Paracentral

lobu le

Precentral sulcus

White

matter

Cortical

plate

Layer I

Rostral migratory

stream

(source area)

Rostral migratory

stream

(source area)

Anterolateral striatal neuroepithelium

and subventricular zone

Anterolateral striatal neuroepithelium

and subventricular zone

Anteromedial striatal neuroepithelium

and subventricular zone

Anteromedial striatal neuroepithelium

and subventricular zone

Diencephalic (thalamic)

glioepithelium/ependyma

Diencephalic (thalamic)

glioepithelium/ependyma

Callosal slinCallosal slingg

Callosal slinCallosal slingg

PLATE 83B