The Human Brain During the Third Trimester

Lateral

tuberal

nucleus

Lateral

tuberal

nucleus

Germinal and transitional structures in italics

Fimbria/

fornix

Fimbria/

fornix

Dentate gyrusDentate gyrus

Ammon's horAmmon's hornn

SubiculuSubiculumm

DORSAL

HIPPOCAMPUS

DORSAL

HIPPOCAMPUS

Optic

tract

O

p

tic

tr

a

ct

Lateral fissure

Ventral

striatum

Ve ntral

striatum

Optic

tract

O

p

tic

tr

a

ct

O

p

tic

tr

a

ct

O

pt

ic

(^) t
ra
ct

O

pt

ic

(^) t
ra
ct
O
p
tic
tr
a
ct
O
p
tic
t
ra
ct
O
p
tic
t
ra
ct
Un
cin
ate
fas
cic
ul
us
Un
cin
ate
fas
cic
ul
us
D
ia
go
n
al
b
a
nd
o
f^
B
ro
ca
(h
or
iz
on
ta
l^ l
im
b)
D
ia
go
n
al
b
a
nd
o
f^
B
ro
ca
(h
or
iz
on
ta
l^ l
im
b)
Extern
al^ cap
sule
Extern
al^ cap
sule
Exter
nal capsul
e
Exter
nal capsul
e
Para-
hippocampal
gyrus
Para-
hippocampal
gyrus
Occipital
gyrus
Occipital
gyrus
La
ter
al
ve
ntr
icle
La
ter
al
ve
ntr
icle
Rostral migratory
stream
Rostral migratory
stream
Interhemispheric fissure Raphe nuclear complexRaphe nuclear complex
Habenulo-interHabenulo-interpeduncular tractpeduncular tract
Oculomotor neOculomotor nerve (III)?rve (III)?
Stria
terminalis
Stria
terminalis
Central
nucleus of
amygdala?
Central
nucleus of
amygdala? Choroid
plexus
Choroid
plexus
Third Third ventricleventricle
Supraoptic nucleuSupraoptic nucleuss
Medial prMedial preoptic nucleueoptic nucleuss
Islands of CallejaIslands of Calleja
Lamina terminalisLamina terminalis
PPerieriventricular nucleuventricular nucleuss
Red
nucleus
Red
nucleus
Central
nucleus
Central
nucleus
Oculomotor nuclear complex (III)Oculomotor nuclear complex (III)
Medial longitudinal fasciculuMedial longitudinal fasciculuss
Lateral
lemniscus
Dorsal nucleus of
lateral lemniscus
Brachium of
inferior colliculus

P

r

im

a

r

y

(^) f
is
su
r
e

P

r

im

a

r

y

(^) f
is
su
r
Interpeduncular e
nucleus
Interpeduncular
nucleus
BA
SA
L (^) G
AN
GL
IA
BA
SA
L (^) G
AN
GL
IA
THALAMUS
(POSTERIOR
COMPLEX)
THALAMUS
(POSTERIOR
COMPLEX)
HYPHYPOOTHALAMUSTHALAMUS

SU

BS

TA

N

TI

A

IN

N

O

M

IN

A

T

A

SU

BS

TA

N

TI

A

IN

N

O

M

IN

A

TA

Late

ral^ h

ypo-

thala

mic^ a

Lateral^ rea

hypo

• 
  

thala

mic^ a

rea

IN

FE

RI

OR

CO

LL

IC

UL

US

IN

FE

RI

OR

CO

LL

IC

UL

US

Medial

geniculate

body

Medial

geniculate

body

Lateral

geniculate

body

Lateral

geniculate

body

Central

gray

Central

gray

Cerebral

aqueduct

Cere bral

aqueduct

Ventro-

medial nuc.

Ve ntro -

medial nuc.

Supra-

mammillary

area

Supra-

mammillary

area Inter-

peduncular

fossa

Inter-

peduncular

fo ssa

Ventral te

gmental

area

Ventral te

gmental

area

Culmen

IV

,

V

Culmen

IV

,

V

Decli

v

e

VI

Declive

VI

Centralis

III

Centralis

III

Lingul

a

I, II

Lingul

a

I, II

Anterior lobe

HI-HV

Anterior lobe

HI-HV

C

e

re

b

ra

l

p

ed

u

n

cl

e

C

e

re

b

ra

l

p

ed

u

n

cl

e

O

lfactory tube

r

cl

e

O

lfactory tube

rc

le

Basal nucleus

of Meynert

Basal nucleus

of Meynert

A

nte

rio

r

co

m

m

iss

ur

e

A

nte

rio

r

co

m

m

iss

ur

e

E

n

do

p

ir

if

o

rm

n

u

cl

eu

s

E

n

do

p

ir

if

o

rm

n

u

cl

eu

s

FFornixornix

S

u

b

st

a

n

ti

a

ni

gr

a

S

u

b

st

a

n

ti

a

ni

gr

a

C

e

re

b

r

al

p

e

d

u

nc

le

C

e

re

b

r

al

p

e

d

u

nc

le

In

ter

na

lc

ap

su

le

(po

ste

rio

rl

im

b)

In

ter

na

lc

ap

su

le

(po

ste

rio

rl

im

b)

Lateral fissure

In

su

la

r^

gy

ru

s

In

su

la

r^

gy

ru

s

Subcallosal

area

Subcallosal

area

Pa

ra

br

ac

hia

lnu

c.

Pa

ra

br

ac

hia

lnu

c.

M

edia

l

lem

Mniscus?

edia

l

lem

niscus?

VERMISVERMIS

HEMISPHEREHEMISPHERE

CEREBELLUMCEREBELLUM

PREOPTIC

AREA

PREOPTIC

AREA

Reticular Reticular fformatio normation

Caudate (tail)Caudate (tail)

Lateral migratory

stream (infiltrates the
endopiriform nucleus)

Lateral migratory

stream (infiltrates the
endopiriform nucleus)

Lateral migratory

stream (infiltrates the

uncinate fasciculus)

Lateral migratory

stream (infiltrates the

uncinate fasciculus)

Glioepithelium

Alve ar glioepithelium

External

germinal layer

Parahippocampal

neuroepithelium,

subventricular zone, and

stratified transitional field

Pa rahippocampal

neuroepithelium,

subventricular zone, and

stratified transitional field

Te mporal neuroepithelium and subventricular zone

Occipital neuroepithelium

and subventricular zone

Occipital neuroepithelium

and subventricular zone

Te mporal stratified transitional field

Occipital stratified transitional fieldOccipital stratified transitional field

Subgranular zone

Fo rnical glioepithelium

Meyer's loop

(visual radiation)

Meyer's loop

(visual radiation)

Frontal

lobe

Frontal

lobe

Temporal

lobe

Temporal

lobe

Occipital

lobe

Occipital

lobe

TTectuectumm

TTe gmentumegmentum

MIDBRAIMIDBRAINN

White matter

Cortical plate

Layer I

Mesencephalic

glioepithelium/

ependyma

Mesencephalic

glioepithelium/

ependyma

Diencephalic (hypothalamic)

glioepithelium/ependyma

Diencephalic (hypothalamic)

glioepithelium/ependyma

PLATE 88B