The Human Brain During the Third Trimester

Amygdaloid

glioepithelium/

ependyma

Amygdaloid

glioepithelium/

ependyma

Amygdaloid

glioepithelium/

ependyma

Amygdaloid

glioepithelium/

ependyma

Germinal and transitional structures in italics

Frontal

lobe

Frontal

lobe

TTectuectumm

TTe gmentumegmentum

MIDBRAIMIDBRAINN

DORSAL

HIPPOCAMPUS

DORSAL

HIPPOCAMPUS

VENTRAL

HIPPOCAMPUS

VENTRAL

HIPPOCAMPUS

O

p

tic

tr

a

ct

O

p

tic

tr

a

ct

Uncinate

fasciculus

Uncinate

fasciculus

Superior cerSuperior cerebellar peduncleebellar peduncle

Para-

hippocampal

gyrus

Para-

hippocampal

gyrus

Lateral

ve

ntricl

e

Rostral migratory

stream

Subgranular zoneSubgranular zone

Raphe nuclear

complex

Raphe nuclear

complex

Stria

terminalis

Stria

terminalis

Am

ygd

alo

• 
  

hip

po

ca

mp

al

ar

A ea

m

ygd

alo

• 
  

hip

po

ca

mp

al

ar

ea

Central

nucleus

Central

nucleus

Third^ ventricle

Suprachiasmatic

nucleus

Suprachiasmatic

nucleus

Lamina terminalisLamina terminalis

Su

b

ic

u

lu

m

Su

b

ic

u

lu

m

S

u

b

ci

u

ul

m

S

u

b

ci

u

ul

m

Red

nucleus

Red

nucleus

Central

nucleus

Central

nucleus

TTrochlear nerve (IV)?rochlear nerve (IV)?

Dorsal

longitudinal

fasciculus

Dorsal

longitudinal

fasciculus

Brachium of

inferior colliculus

Brachium of

inferior colliculus

Dorsal nucleus

of lateral lemniscus

InterInterpeduncular nucleupeduncular nucleuss

AMYGDAMYGDALAALA

AMYGDAMYGDALAALA

VERMISVERMIS

HEMISPHEREHEMISPHERE

HYPHYPOOTHALAMUSTHALAMUS

IN

F

E

R

IO

R

C

O

LL

IC

U

L

U

S

IN

F

E

R

IO

R

C

O

LL

IC

U

L

U

S

CeCerrebral aqueducebral aqueductt

Ve ntromedial nucleus

EndopirifEndopiriform nucleuorm nucleuss

Arcuate nucleus

Medial

mammillary

nucleus

Medial

mammillary

nucleus

Culmen

IV

,

V

Culmen

IV

,

V

Decli

v

e

VI

Declive

VI

F

oliu

m

VIIa

Fo

liu

m

VIIa

Centrali

s

III

Centrali

s

III

Lingul

a

I, II

Lingul

a

I, II

Anterior lobe

HI-HV

Anterior lobe

HI-HV

Simplex

lobule

HVI

Simplex

lobu le

HVI

A

n

s

if

o

r

m

(^) l
o
b
u
le
C
r
u
s
(^) I
H
V
II
A
A
n
s
if
o
r
m
(^) l
o
b
u
le
C
r
u
s
(^) I
H
V
II
A
C
e
re
b
r
a
l
p
e
d
u
nc
le
C
e
re
b
r
a
l
p
e
d
u
nc
le
A
nt
er
io
r
co
m
m
is
su
re
A
nt
er
io
r
co
m
m
is
su
re
S
u
b
st
an
ti
a
ni
gr
a
S
u
b
st
an
ti
a
ni
gr
a
Ventral
tegmental area
Ve ntral
tegmental area
Oculomotor neOculomotor nerve (III)?rve (III)?
Reticular
formation
Reticular
formatio n
P
rim
a
ry
(^) o
lf
a
ct
or
y
co
rt
ex
(^) (
p
ir
if
o
rm
)
P
rim
a
ry
(^) o
lf
a
ct
or
y
co
rt
ex
(^) (
p
ir
if
o
rm
)
B
a
so
la
te
r
a
l
c
o
m
p
le
x
B
a
so
la
te
r
a
l
c
o
m
p
le
Co x
r
ti
c
o
m
e
d
ia
l
c
o
m
p
le
x
C
o
r
ti
c
o
m
e
d
ia
l
c
o
m
p
le
x
Laterallemnis
cus
Laterallemnis
cus

P

r

mi

a

r

y

fi

s

su

re

P

r

mi

a

r

y

fi

s

su

re

CEREBELLUMCEREBELLUM

H

I

P

P

O

C

A

M

P

U

S

H

I

P

P

O

C

A

M

P

U

S

Dorsal tegmental

nucleus

Dorsal tegmental

nucleus

Lateral olfactory tract

Third ve ntricle

(preoptic recess)

Caudate (tail)

White matter

Cortical plate

Layer I

Internal capsule (posterior limb)

A

m

m

o

n

's

h

o

rn

(C

A

1 )

A

m

m

o

n

's

h

o

rn

(C

A

1 )

A

m

m

o

n

's

h

o

rn

(C

A

3 )

A

m

m

o

n

's

h

o

rn

(C

A

3 )

De

nt

at

e

g

y

r

u

s

De

nt

at

e

g

y

r

u

s

De

nta

tegyru

s

De

nta

tegyru

s

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)

Alve ar glioepithelium

AlvAlve ar glioepitheliuear glioepitheliumm

External

germinal layer

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

Te mporal stratified

transitional field

Fo rnical glioepithelium

Glioepithelium

(optic tract)

Glioepithelium

(optic tract)

Subpial granular layer

Temporal

lobe

Temporal

lobe

Parab

rach

ial nu

cleus

Parab

rach

ial nu

cleus

Mesencephalic

glioepithelium/

ependyma

Mesencephalic

glioepithelium/

ependyma

Diencephalic (hypothalamic)

glioepithelium/ependyma

Diencephalic (hypothalamic)

glioepithelium/ependyma

PLATE 89B