The Human Brain During the Third Trimester

Ventral

medial

nucleus

Ve ntral

medial

nucleus

Orbital gyrusOrbital gyrus

Lateral

ventricle

BASAL

GANGLIA

BA SAL

GANGLIA

VENTRAL

HIPPOCAMPUS

VENTRAL

HIPPOCAMPUS

PulvinarPulvinar

PulvinarPulvinar

P

O

ST

E

R

IO

R

C O M P L E X

P

O

ST

E

R

IO

R

C O M P L E X

PutamenPutamen

Ventral

striatum

Ve ntral

striatum

Caudate

(body)

Caudate

(body)

SubiculuSubiculumm

SubiculuSubiculumm

Anterior

commissure

Anterior

commissure

ChorChoroid plexusoid plexus

DORSAL

HIPPOCAMPUS

DORSAL

HIPPOCAMPUS

Co

rpus callosum

Corpus callosum

Ventral

postero-

lateral

nucleus

Ve ntral

postero-

lateral

nucleus

Ventral

postero-

medial

nucleus

Ve ntral

postero-

medial

nucleus

Ventral

lateral

nucleus

Ve ntral

lateral

nucleus

THALAMUSTHALAMUS

Medial

geniculate

body?

Medial

geniculate

body?

Lateral

geniculate

body

Lateral

geniculate

body

In

te

r

n

a

l

c

a

p

su

le

(a

n

te

ri

o

r

li

m

b)

In

te

r

n

a

l

c

a

p

su

le

(a

n

te

ri

o

r

li

m

b)

Caudate

(head)

Caudate

(head) V

E

N

T

R

A

L

C

O

M

PL

EX

V

E

N

T

R

A

L

C

O

M

PL

EX

B

as

o

la

te

ra

l

co

m

pl

ex

B

as

o

la

te

ra

l

co

m

pl

ex

FFornixornix

Primary olfactory cortexPrimary olfactory cortex

Lateral olfactory tractLateral olfactory tract

Co

rti

ca

lpl

ate

Co

rti

ca

lpl

ate

White matterWhite matter

Globus pallidus

(internal

segment)

Glob us pallidus

(internal

segment)

Globus pallidus

(external

segment)

Glob us pallidus

(external

segment)

SUBSTANTIA

INNOMINATA

SUBSTANTIA

INNOMINAT A

Basal nucleus

of Meynert

Basal nucleus

of Meynert

Dentate

gyrus

Dentate

gyrus

Dentate

gyrus

Dentate

gyrus

Ammon's

horn

Ammon's

horn

Ammon's

horn

Ammon's

horn

Medullary laminaMedullary lamina

Damaged arDamaged areaea

An

sa l

ent

icu

lar

is (^)
An
sa l
ent
icu
lar
is (^)
FimbriaFimbria
Auditory and visual
radiations?
Auditory and visual
radiations?
I
n
t
e
r n a l c a p s
u
l
e
I
n
t
e
r n a l c a p s
u
l
e
Lateral
A ventricle
M
Y
G
D
A
L
A
A
M
Y
G
D
A
L
A
Co
rt
ic
o
m
de
ai
l
oc
m
p
el
x
Co
rt
ic
o
m
de
ai
l
oc
m
p
el
x
Frontal
lobe
Frontal
lobe
Frontal
lobe
Frontal
lobe
Temporal
lobe
Te mporal
lobe
Pa rahippocampal
stratified transitional field
Central
nucleus
Central
nucleus
Opti
ctra
ct
O
pt
ic
tra
ct
Opti
ctra
ct
O
pt
ic
tra
ct
Cerebral
peduncle
Cere bral
peduncle

R

E

T

IC

U

L

A

R

B

E

L

T

(R

et

ic

u

la

r

n

u

c

le

u

s)

R

E

T

IC

U

L

A

R

B

E

L

T

(R

et

ic

u

la

r

n

u

c

le

u

s)

RReettiiccuullaarrnnuucclleeuuss

Stri

ate

rmin

alis

Stri

ate

rmin

alis

In

te

rn

al

ca

psu

le

(po

ster

iorl

imb)

In

te

rn

al

ca

psu

le

(po

ster

iorl

imb)

Lateral

migratory

stream

Lateral

migratory

stream

Corona

radiata

Corona

radiata

Corona

radiata

Corona

radiata

Pa racentral neuroepithelium

and subventricular zone

Rostral

migratory

stream

(source area)

Rostral

migratory

stream

(source area)

Callosal glioepitheliuCallosal glioepitheliumm

Frontal stratified

transitional field

Fr ontal stratified

transitional field

Frontal stratified

transitional field

Fr ontal stratified

transitional field

Pa racentral stratified transitional field

Subpial granular layer

Subgranular

zone

Subgranular

zone

Subgranular

zone

Subgranular

zone

Alve ar

glioepithelium

Amygdaloid glioepithelium/ependuma Parahippocampal neuroepithelium

and subventricular zone

LayLayer er II

Stem cells of the Stem cells of the choroid plexuschoroid plexus??

P

a

ra

h

ip

p

o

ca

m

p

a

l

gy

ru

s

P

a

ra

h

ip

p

o

ca

m

p

a

l

gy

ru

s

Orbital gyrusOrbital gyrus

S

te

m

c

el

ls

o

f^

th

e

ch

or

o

id

p

le

x

u

s?

A

nterolateral striatalneuroepitheliu

m

and subv

entricular zone

A

nterolateral striatalneuroepitheliu

m

and subv

entricular zone

Anteromedial/posterior striatal neuroepithelium

and subventricular zone

Anteromedial/posterior striatal neuroepithelium

and subventricular zone

Frontal neuroepithelium

and subventricular zone

Fr ontal neuroepithelium

and subventricular zone

Strionuclear

glioepithelium

Strionuclear

glioepithelium

Fornical

glioepithelium

Fo rnical

glioepithelium

Germinal and transitional structures in italic s

PLATE 207B