The Human Brain During the Third Trimester

Glob

us pallidus

(exter

nal segment)

Glob

us pallidus

(exter

nal segment)

Vental

anterior

nucleus

Vental

anterior

nucleus

Ve ntal

anterior

nucleus

FrFrontal lobeontal lobe

Interhemispheric

fissure

White

matter

Layer I

Cortical

plate

Cingulate

gyrus

Cingulate

gyrus

Induseum

griseum

Induseum

griseum

Lateral

ventricle

Lateral

ventricle

E

x

te

rn

a

l

ca

p

su

le

E

x

te

rn

a

l

ca

p

s

u

le

Temporal

lobe

Te mporal

lobe

P

u

ta

m

e

n

P

u

ta

m

e

n

C

la

u

str

u

m

C

la

u

str

u

m

FFornixornix

A

nt

er

io

r

co

m

m

is

su

re

A

nt

er

io

r

co

m

m

is

su

re

Third

ventricle

Third

ventricle

Third

ventricle

Third

ventricle

Globus pallidus

(internal segment)

Globus pallidus

(internal segment)

Amygdalo-

hippocampal

area

I

n

te

r

n

a

l

c

a

p

s

u

le

I

n

te

r

n

a

l

c

a

p

s

u

le

I

n

te

r

n

a

l

c

a

p

s

u

le

I

n

te

r

n

a

l

c

a

p

s

u

le

Choroid

plexus

Choroid

plexus

E

n

to

r

h

in

a

l

c

o

r

te

x

E

n

to

r

h

in

a

l

c

o

r

te

x

Basal nucleus of MeynertBasal nucleus of Meynert

Antero-

ventral

nucleus

Antero-

ventra l

nucleus

Arcuate

nucleus

Arcuate

nucleus

Optic

tract

Optic

tract

Corpus callosum

(body)

Corpus callosum

(body)

FFornixornix

Dorso-

medial

nucleus

Dorso-

medial

nucleus

Ventro-

medial

nucleus

Ve ntro -

medial

nucleus

Lateral

hypothalamic

area

Lateral

hypothalamic

area

Stria

Stria medullaris

terminalis

Stria

terminalis

Mammillo-

thalamic

tract

Mammillo-

thalamic

tract

Medial

forebrain

bundle

Medial

forebrai n

bundle

Caudate

nucleus

(tail)

Caudate

nucleus

(tail)

Accessory

basal

nucleus

Accessory

basal

nucleus

Basal

nucleus

Basal

nucleus

Lateral nucleuLateral nucleuss

Medial

nucleus

Medial

nucleus

Central

nucleus

Central

nucleus

Cortical

nucleus

Cortical

nucleus

Zona

incerta

Zona

incerta

Intercalated cell

groups

Intercalated cell

groups

M

e

d

u

ll

a

r

y

la

m

in

a

M

e

d

u

ll

a

r

y

la

m

in

a

P

a

ra

v

en

tr

ic

u

la

r

n

.

P

a

ra

v

en

tr

ic

u

la

r

n

.

Reuniens

nucleus

Reuniens

nucleus

Ansa lenticularisAnsa lenticularis

Internal capsule/

cerebral peduncle

junction

Internal capsule/

cerebral peduncle

junction

R

et

ic

u

la

r

n

u

c

le

u

s

R

et

ic

u

la

r

n

u

c

le

u

s

Callosal

glioepithelium

Callosal

glioepithelium

SUBSTANTIA

INNOMINATA

SUBSTANTIA

INNOMINAT A

ANTERIOR

COMPLEX

ANTERIOR

COMPLEX

R

ET

IC

UL

A

R

(^) B
E
LT
R
ET
IC
UL
A
R
(^) B
E
LT
V
E
N
T
R
A
L
C
O
M
PL
E
X
V
E
N
T
R
A
L
C
O
M
PL
E
X
C
EN
TR
AL
CO
M
PL
E
X
C
EN
TR
AL
CO
M
PL
E
X
DORSAL COMPLEXDORSAL COMPLEX
THALAMUSTHALAMUS
HYPHYPOOTHALAMUSTHALAMUS
BBA SAL GANGLIASAL GANGLIAA
Ce
nt
ra
ll
at
er
al
nu
cl
eu
s
Ce
nt
ra
ll
at
er
al
nu
cl
eu
s
Parac
entra
ln.
Parac
entra
ln.
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
dorsadorsall
vventra lentral
Insular
gyrus
Insular
gyrus
AMYGDAMYGDALAALA
SUBT
HALA
MUS
SUBT
HALA
MUS
Cave of the
septum
Subfornical
orga n
Fo
ra
m
en
of

M

on

ro

Fo

ra

m

en

of

M

on

ro

Do

rs

om

ed

ia

l

n

u

cl

e

u

s

Do

rs

om

ed

ia

l

n

u

cl

e

u

s

Massa

intermedia

Massa

intermedia

Pa rahippocampal neuroepithelium, subventricular

zone, and stratified transitional field

Posterior striatal

neuroepithelium and

subventricular zone

Po sterior striatal

neuroepithelium and

subventricular zone

Amygdaloid

glioepithelium/

ependyma

Amygdaloid

glioepithelium/

ependyma

Subpial granular layer

FFo rnical glioepitheliuornical glioepitheliumm

Frontal neuroepithelium

and subventricular zone

Fr ontal neuroepithelium

and subventricular zone

Frontal stratified

transitional field

Fr ontal stratified

transitional field

Strionuclear

glioepithelium

Stem cells of

choroid plexus

Stem cells of

choroid plexus

Lateral

fissure

Uncinate

fasciculus

Uncinate

fasciculus

Hypothalamic

glioepithelium/ependyma

Hypothalamic

glioepithelium/ependyma

Glioepithelium

(optic tract)

Temporal stratified

transitional field

Te mporal stratified

transitional field

Thalamic

glioepithelium/

ependyma

Thalamic

glioepithelium/

ependyma

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 )

Lateral migratory stream

(extends to amygdala)

Lateral migratory stream

(extends to amygdala)

Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics

Parahippocampal

gyrus

Parahippocampal

gyrus

Callosal slinCallosal slingg

PLATE 35B