The Human Brain During the Third Trimester

Paracentral

lobule

Paracentral

lobule

C

en

tr

a

ll

a

te

r

a

l

n

u

c

le

u

s

C

en

tr

a

ll

a

te

r

a

l

n

u

c

le

u

s

Dorso-

medial

nucleus

Dorso-

medial

nucleus

Interhemispheric

fissure

White

matter

Layer I

Cortical

plate

Cingulate

gyrus

Cingulate

gyrus

Induseum griseuInduseum griseumm

E

x

te

rn

a

l

ca

p

su

le

E

x

te

rn

a

l

ca

p

su

le

Temporal

lobe

Te mporal

lobe

Lateral

fissure

C

la

u

st

ru

m

C

la

u

st

ru

C m

la

u

st

ru

m

C

la

u

st

ru

m

FFFFornixororornininixxx

F

o

r

n

ix

F

o

r

n

ix

F

o

r

n

ix

F

o

r

n

ix

Third

ventricle

Third

ventricle

In

te

rn

al

ca

p

su

le

In

te

rn

al

ca

p

su

le

ChorChoroid plexusoid plexus

E

n

to

r

h

in

a

l

c

o

r

te

x

GlobGlobus us PallidusPallidus

Optic

tract

Optic

tract

CoCorpus callosum (body)rpus callosum (body)

R

e

ti

cu

la

r

n

u

c

le

u

s

R

e

ti

cu

la

r

n

u

c

le

u

s

Medial mammillary

nuclei

Medial mammillary

nuclei

Mammillo-

thalamic

tract

Mammillo-

thalamic

tract

FFoorreell''ss ffiieellddss

Su

bth

al

am

ic^

nu

cle

us

Su

bth

al

am

ic^

nu

cle

us

Caudate

nucleus

(body)

Caudate

nucleus

(body)

Basal nucleuBasal nucleuss

Lateral

nucleus

Lateral

nucleus

Amygdalo-

hippocampal

area

Amygdalo-

hippocampal

area

Central nucleuCentral nucleuss

Zona

incerta

Zona

incerta

Ce

re

br

al

pe

du

nc

le

Ce

re

br

al

pe

du

nc

le

Lateral

ventricle

PutamenPutamen

AAmmmmoonn's 's hhoorrnn

Lateral

mammillary

nucleus

Lateral

mammillary

nucleus

Supra-

mammillary

nucleus

Supra-

mammillary

nucleus

A

c

ce

ss

o

ry

ba

sa

ln

uc

leu

s

A

c

ce

ss

o

ry

ba

sa

ln

uc

leu

s

Anterior

commissu

re

Anterior

commissu

re

Anterior

commissu

re

Anterior

commissu

re

Antero-

ventral

nucleus

Antero-

ventra l

nucleus

Cortical

nucleus

Cortical

nucleus

Intercalated cell

groups

Intercalated cell

groups

CingulumCingulum

Ventral anterior

nucleus

Ve ntral anterior

nucleus

Ventral medial

nucleus

Ventral medial

nucleus

Stria

terminalis

Stria

terminalis Stria

medullaris

Uncinate

fasculus

Uncinate

fasculus

Ansa lenticularis and

ventral amygdalofugal

fibers

Ansa lenticularis and

ventral amygdalofugal

fibers

Reuniens

nucleus

Reuniens

nucleus

Layer I

Layer II

(stellate cell islands)

Layer III

Layer IV

(lamina dessicans)

Layers V- VI

Insular

gyrus

Insular

gyrus

Internal

segment

Internal

segment

External

segment

External

segment

ANTERIOR

COMPLEX

ANTERIOR

COMPLEX

R

E

T

IC

U

L

A

R

(^) B
E
LT
R
E
T
IC
U
L
A
R
(^) B
E
LT
V
EN
T
R
A
L
(^) C
O
M
P
L
EX
V
EN
T
R
A
L
(^) C
O
M
P
L
EX
D
O
R
S
A
L
(^) C
O
M
P
L
E
X
D
O
R
S
A
L
(^) C
O
M
P
L
E
X
THALAMUSTHALAMUS
HYPHYPOOTHALAMUSTHALAMUS
BBA SAL GANGLIASAL GANGLIAA
P
E
R
IV
E
N
T
R
IC
U
L
A
R
C
O
M
P
L
E
X
P
E
R
IV
E
N
T
R
IC
U
L
A
R
(^) C
O
M
P
L
E
X
AAMMYYGGDDAALLAA
HHIPPOIPPOCCAAMMPUPUSS
SUB
THA
LAM
US
SUB
THA
LAM
US
Callosal glioepitheliuCallosal glioepitheliumm
Cave of the
septum
Subfornical
orga n
Lateral
ventricle
Centro-
median
nucleus
Centro -
median
nucleus
C
E
N
T
R
A
L
C
O
M
PL
E
X
C
E
N
T
R
A
L
C
O
M
PL
E
X
Massa
intermedia
Massa
intermedia
Posterior striatal
neuroepithelium and
subventricular zone
Po sterior striatal
neuroepithelium and
subventricular zone
FFo rnical glioepitheliuornical glioepitheliumm
Frontal/paracentral
neuroepithelium and
subventricular zone
Fr ontal/paracentral
neuroepithelium and
subventricular zone
Frontal/paracentral stratified
transitional field
Fr ontal/paracentral stratified
transitional field
Strionuclear
glioepithelium
Hypothalamic
glioepithelium/ependyma
Hypothalamic
glioepithelium/ependyma
Thalamic
glioepithelium/
ependyma
Thalamic
glioepithelium/
ependyma
Temporal stratified
transitional field
Te mporal stratified
transitional field
Temporal neuroepithelium
and subventricular zone
Te mporal neuroepithelium
and subventricular zone
Lateral migratory
stream (infiltrates
the claustrum)
Lateral migratory
stream (infiltrates
the claustrum)
Lateral migratory
stream (extends to
temporal cortex)
Lateral migratory
stream (extends to
temporal cortex )
Parahippocampal
gyrus
Parahippocampal
gyrus
Parahippocampal neuroepithelium, subventricular
zone, and stratified transitional field
Pa rahippocampal neuroepithelium, subventricular
zone, and stratified transitional field
AlvAlve ar glioepitheliuear glioepitheliumm
Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics
Subpial granular layer

P

a

r

av

en

tr

ic

u

la

r

n

u

c

le

u

s

P

a

r

av

en

tr

ic

u

la

r

n

u

c

le

u

s

Amygdaloid

glioepithelium/

ependyma

Amygdaloid

glioepithelium/

ependyma

Callosal slinCallosal slingg

PLATE 36B