The Human Brain During the Third Trimester

Choroid plexus

HIPPOCAMPUHIPPOCAMPUSS

Fimbria/fornix

Subiculum Dentate gyrus Ammon's horn

Cingulate gyrusCingulate gyrus

CingulumCingulum

C au da te

(^) (
he
ad
)
C
au
da
te
(^) (
he
ad
)
Pu
tam
en
Pu
tam
en
Posterior commissure
Clau
strum
Clau
strum
Lateral ventricle
Me yer's loop (visual radiation)
Lateral
ve
ntricl
e
Temporal
lobe
Te mporal
lobe
Frontal
lobe
Frontal
lobe
Lateral migratory stream
(infiltrating the claustrum and entering the insular cortex)
Insular gyrusInsular gyrus
Exte
rnal^
caps
ule
Exter
nal^ c
apsule
Lateral fissure
Superior temporal
gyrus
Stria
terminalis
Stria
terminalis
Stria terminalisStria terminalis
I
n
t
e
r
n
a
l
c
a
p
s
u
le
I
n
t
e
r
n
a
l
c
a
p
s
u
A le
n
te
ri
or
li
m
b
A
n
te
ri
or
li
m
b

R

E

T

IC

U

L

A

R

B

E

L

T

R

E

T

IC

U

L

A

R

B

E

L

T

V

E

N

T

R

A

L

C

O

M

P

L

E

X

V

E

N

T

R

A

L

C

O

M

P

L

E

X

ANTERIOR COMPLEX

PO

ST

ER

IO

R

CO

M

PL

EX

PO

ST

ER

IO

R

CO

M

PL

EX

C

E

N

T

R

A

L

C

OM

PL

EX

C

E

N

T

R

A

L

C

OM

PL

EX

B

A

S

A

L

G

A

N

G

L

IA

B

A

S

A

L

G

A

N

G

L

IA

Layer I

Cortical plate

White matter

THALAMUSTHALAMUS

SEPTUMSEPTUM

Lateral septal nucleus

Antero- medial nucleus

Ventra

l (^) anter
nucl ior
eus
Ventra
l (^) anter
nucl ior
eus
Vent
ral (^) la
tera
nucleus l
Vent
ral (^) la
tera
nucleus l
Ventral
posteromedial
nucleus
Ve ntral
posteromedial
nucleus
Ventral
posterolateral
nucleus
Ventral
posterolateral
nucleus

R

et ic u la r nu cl eu s

R

et ic u la r nu cl eu s

Cave of the septum

Cave of th e septum

Hippocampalcommissu

re?

Hippocampalcommissu

re

?

Inferior frontal gyrus

PER

IV EN TR ICU

LA R^ C

OM

PL EX

PER

IV EN TR ICU

LA R^ C

OM

PL EX

M

am

m

ill o-

th

al am

ic tr

ac

t?

M

am

m

ill o-

th

al am

ic tr

ac

t?

Centromedian nucleus

Centro median nucleus

G

lo bus pallidus

(exter

nal segm

ent

)

G

lob

us pallidus

(exter

nal segm

ent

)

Third ventricle

Co

r pus callosu

m

(genu)

Corpus callosu

m

(genu)

Diencephalic (thalamic) glioepithelium/ependyma

Mesencephalic glioepithelium/ependyma

Central lateral nucleus

Reuniens nucleus

Bed nucleus of the stria terminalis

G

lo

bus pallidus

(inter

nal segm

ent)

G

lo

bu

s pallidus

(inter

nal segm

ent)

M

ed

ul la ry

la m ina

M

ed

ul la ry

la m ina

MIDBRAI

N

TECTUM

MIDBRAI

N

TECTUM

colliculuSuperior

s

colliculuSuperior

s

Lateral geniculate body

S up ra ge ni cu la te

nu cl eu s

S up ra ge ni cu la te

nu cl eu s

P

R

E

T

E

C

T

U

M

P

R

E

T

E

C

T

U

M

Corticofugal fiber s (in internal capsule)

Subgranular zoneSubgranular zone

Fr ontal neuroepithelium

and subventricular zone

Pa rahippocampal neuroepithelium and subventricular zone

Pa rahippocampal stratified transitional field

Fr ontal stratified transitional field

Fo rnical glioepithelium

Subpial granular layer

Callosal glioepithelium

Te mporal neuroepithelium and subventricular zone

Te mporal stratified transitional field

FFornixornix

For ni x

Fo rn ix

Germinal and transitional

structures in italics

Germinal and transitional

structures in italics

P

o

st

e

r io

r l im

b

P

o

st

e

r io

r l im

b

Posterior striatal neuroepithelium and subventricular zone

Po sterior striatal neuroepithelium and subventricular zone

Stem cells of the choroid plexus

Caudate (tail)Caudate (tail)

G

li oe pi th el iu m

AlAlvve ar glioepitheliuear glioepitheliumm

Septal glioepithelium/ ependyma

Striatal neuroepithelium and subventricular zone

AnterolateraAnterolaterall

AnteromedialAnteromedial

GlioepitheliuGlioepitheliumm

Strionuclear glioepithelium

PLATE 232B