The Human Brain During the Third Trimester

FFr ontal stratified transitional fielrontal stratified transitional fieldd

Frontal neuroepithelium

and subventricular zone

Fr ontal neuroepithelium

and subventricular zone

FFrroonnttaall^ lloobbee

Interhemispheric

fissure

White matter

Cortical plate

Layer I

Cingulate

gyrus

Cingulate

gyrus

SEPTUMSEPTUM

PREOPTIC

AREA

PREOPTIC

AREA

BASAL

GANGLIA

BA SAL

GANGLIA

C

a

u

d

a

te

(^) n
u
cle
u
s
(h
ea
d
)
C
a
u
d
a
te
(^) n
u
cle
u
s
(h
ea
d
)
TTe mporal lobeemporal lobe
Lateral
fissure
Rostral migratory streaRostral migratory streamm
Inte
rnal capsule (anterior limb)
Inter
nal capsule (anterior limb)
PutamenPutamen
Inferior temporal
gyrus
Inferior temporal
gyrus
Fusiform
gyrus
Fusiform
gyrus
Middle temporal
gyrus
Middle temporal
gyrus
Superior temporal
gyrus
Superior temporal
gyrus
Inferior frontal
gyrus
Inferior frontal
gyrus
Parolfactory
gyrus
Parolfactory
gyrus
Large island
of Calleja
Large island
of Calleja
Olfactory
tubercle
Olfactory
tubercle
Olfactory
tubercle
Olfactory
tubercle
Cor
pusca
llosum(bod
y)
Cor
pusca
llosum(bod
y)
D
ia
go
na
l^ b
an
d^
of
B
ro
ca
(v
er
ti
ca
l^ l
im
b)
D
ia
go
na
l^ b
an
d^
of
B
ro
ca
(v
er
ti
ca
l^ l
im
b)
Medial
septal
nucleus
Medial
septal
nucleus
Callosal glioepithelium
Fornical
glioepithelium
Fo rnical
glioepithelium
Anterolateral striatal neuroepithelium
and subventricular zone
Anterolateral striatal neuroepithelium
and subventricular zone
Anteromedial striatal neuroepithelium
and subventricular zone
Anteromedial striatal neuroepithelium
and subventricular zone
Lateral migratory stream
(infiltrates claustrum and
penetrates insular cortex)
Lateral migratory stream
(infiltrates claustrum and
penetrates insular cortex)
Lateral migratory stream
(infiltrates endopiriform nucleus
and penetrates piriform cortex)
Lateral migratory stream
(infiltrates endopiriform nucleus
and penetrates piriform cortex)
Lateral migratory stream
(extends to olfactory tubercle)
Lateral migratory stream
(extends to olfactory tubercle)
Ventral
striatum
Ve ntral
striatum

C

in

gu

lu

m

C

in

gu

lu

m

Ant

erio

r^ co

mm

issu

re

Ant

erio

r^ co

mm

issu

re

Induseum

griseum

Third ve ntricle

(preoptic recess)

Lateral

olfactory tract

Endopiriform

nucleus

Endopiriform

nucleus

Globus

pallidus

Globus

pallidus

Cave of the

septum

Cave of th e

septum

Uncinate

fasciculus

Uncinate

fasciculus

I

n

s

u

l

a r g y r u s

I

n

s

u

l

a r g y r u s

C

al

u

st

r

u

m

C

al

u

st

r

u

m

E

x

et

r

n

a

l

c

a

p

s

u

le

E

x

et

r

n

a

l

c

a

p

s

u

le

N

u

c

le

u

s

a

c

c

u

m

be

ns

N

u

c

le

u

s

a

c

c

u

m

be

ns

rP

mi

ra

y

o

fl

a

tc

ro

y

oc

rt

ex

(pirifor

m

)

rP

mi

ra

y

o

fl

a

tc

ro

y

oc

rt

ex

(pirifor

m

)

Su

bs

tan

tia

inn

om

inat

a

Su

bs

tan

tia

inn

om

inat

a

L

a

te

ar

l

se

p

at

l

n

u

c

le

u

s

L

a

te

ar

l

se

p

at

l

n

u

c

le

u

s

F

o

rn

ix

(c

o

lu

m

n

)

F

o

rn

ix

(c

o

lu

m

n

)

Islands of CallejaIslands of Calleja

Abnormal

hemorrhage in the

germinal matrix

Abnormal

hemorrhage in the

germinal matrix

Accumbent neuroepithelium

and subventricular zone

Accumbent neuroepithelium

and subventricular zone

Subpial

granular layer

L

ateral ventricle

Septal

glioepithelium/

ependyma

Septal

glioepithelium/

ependyma

Germinal and transitional structures in italics

Middle frontal

gyrus

Middle frontal

gyrus

Callosal slingCallosal sling

PLATE 175B