The Human Brain During the Third Trimester

Ventral

medial

nucleus

Ve ntral

medial

nucleus

An

te

rio

r lo

be

(H

I-H

V)

An

te

rio

r lo

be

(H

I-H

V)

Simplex

lobule

(HVI)

Simplex

lobu le

(HVI)

Primary fissure

Ansiform lobule

crus II

(HVIIA)

Ansiform lobu le

crus II

(HVIIA)

Ansiform lobule

crus I

(HVIIA)

Ansifo rm lobu le

crus I

(HVIIA)

Olfactory

tube

Olfactoryrcle

tubercle

Orbital gyrusOrbital gyrus

Lateral

ventricle

A

M

Y

G

D

A

L

A

A

M

Y

G

D

A

L

A

Choroid

plexus

Choroid

plexus

Corpus

callosum

(splenium)

Corpus

callosum

(splenium)

BASAL

GANGLIA

BA SAL

GANGLIA

VENTRAL

HIPPOCAMPUS

VENTRAL

HIPPOCAMPUS

Nerve

V (ro

ot)

Nerve

V (ro

ot)

PulvinarPulvinar

P

O

S

T

E

R

IO

R

C

O

M

P

L

E

X

P

O

S

T

E

R

IO

R

C

O

M

P

L

E

X

Dorsal

cochlear

nucleus

Dorsal

cochlear

nucleus

Optic

tract

Optic

tract

Nucleus

accumbens

Nucleus

accumbens

En

tor

hin

al

cor

tex

En

tor

hin

al

cor

tex

SubiculuSubiculumm

SubiculuSubiculumm

Anterior

commissure

Anterior

commissure

Choroid

plexus

Choroid

plexus

DORSAL

HIPPOCAMPUS

DORSAL

HIPPOCAMPUS

C

in

gu

la

te

g

y

ru

s

(r

et

ro

sp

le

n

ia

l^ a

re

a)

C

in

gu

la

te

g

y

ru

s

(r

et

ro

sp

le

n

ia

l^ a

re

a)

Co

rp

us

(^) ca
llo
su
m
Co
rp
us
cal
los
um
11
11
33
22
44
44
44
5
66
15
15
1414
1313
1313
16
16
16
CEREBELLUM
(HEMISPHERE)

C

in

gu

lu

m

C

in

gu

lu

m

DORSAL

COMPLEX

DORSAL

COMPLEX

Dorsola

teral

nucleus

Dorsola

teral

nucleus

Sub-

thalamic

nucleus

Sub-

thalamic

nucleus

Middle

cerebellar peduncle

Middle

cerebellar peduncle

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

Ventral

Anterior

nucleus

Ve ntral

Anterior

nucleus

Ventral

Anterior

nucleus

Ve ntral

Anterior

nucleus

THALAMUSTHALAMUS

Dentate nucleuDentate nucleuss

Para-

flocculus

(HIX)

Para -

flocculus

(HIX)

Biventral

lobule

(HVIII)

Biventra l

lobu le

(HVIII)

Paramedian

lobule

(HVIIB)

Paramedian

lobu le

(HVIIB)

Medial

geniculate

body

Medial

geniculate

body

Cerebralpedu

nc

le

Cerebralpedu

nc

le

In

te

rn

a

lc

a

p

su

le

(a

n

te

ri

or

li

m

b

)

In

te

rn

a

lc

a

p

su

le

(a

n

te

ri

or

li

m

b

)

Caudate

(head)

Caudate

(head)

V

E

N

T

R

A

L

CO

MPLE

X

V

E

N

T

R

A

L

CO

MPLE

X

C

or

tic

om

ed

ia

lc

om

ple

x

C

or

tic

om

ed

ia

lc

om

ple

x

B

a

so

la

te

ra

l

co

m

pl

ex

B

a

so

la

te

ra

l

co

m

pl

ex

In

fe

ri

or

ce

re

be

llar

pedun

cle

In

fe

ri

or

ce

re

be

llar

pedun

cle

FFornixornix

Primary olfactory cortexPrimary olfactory cortex

Lateral olfactory tractLateral olfactory tract

Pa

rie

to

• oc

ci

pi

tal

su

lcu

s

Pa

rie

to

• oc

ci

pi

tal

su

lcu

s

Calcarine sulcuCalcarine sulcuss

P

a

r

a

h

ip

p

o

c

a

m

p

a

l

g

y

r

u

s

P

a

r

a

h

ip

p

o

c

a

m

p

a

l

g

y

r

u

s Occipital lobeOccipital lobe

C

o

r

ti

c

a

l

p

la

te

C

o

r

ti

c

a

l

p

la

te

White matterWhite matter

Globus pallidus

(internal

segment)

Globus pallidus

(internal

segment)

Globus pallidus

(external

segment)

Globus 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

Amygdalo-

hippocampal

area

Amygdalo-

hippocampal

area

Medullary laminaMedullary lamina

St

ri

at

er

m

in

ali

s

St

ri

at

er

m

in

ali

s

Damaged arDamaged areaea

99

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

R E T I C U L A R B E L T

(R

e

ti

cu

la

r

n

uc

le

us

)

R E T I C U L A R B E L T

(R

e

ti

cu

la

r

n

uc

le

us

)

Suprageniculate

nucleus

Suprageniculate

nucleus

C

E

NT

RA

L

C

OM

PL

E

X(

Cen

tra

lla

tera

lnu

cleu

s

C

E

NT

RA

L

C

OM

PL

E

X(

Cen

tra

lla

tera

lnu

cleu

s

oP

ts

er

io

r

lim

b

oP

ts

er

io

r

lim

b

L

ta

er

al

ve

n

tr

ic

le

Flocculus

(HX)

Flocculus

(HX)

V

en

tr

al

co

chl

ear

nucl

eus

V

en

tr

al

co

chl

ear

nucl

eus

77

88

1111

1010

1212

LaLayer yer II

9 Alvear glioepithelium

10 Subgranular zone

11 Amygdaloid glioepithelium/ependyma

13 Anteromedial striatal neuroepithelium and subventricular zone

12 Anterolateral striatal neuroepithelium and subventricular zone

6

Occipital neuroepithelium and

subventricular zone

7 Occipital stratified transitional field

8

Parahippocampal neuroepithelium, subventricular

zone, and stratified transitional field

2 Frontal neuroepithelium and subventricular zone

Remnants of the germinal matrix,

migratory streams, and transitional fields

Remnants of the germinal matrix,

migratory streams, and transitional fields

15 External germinal layer

14 Strionuclear glioepithelium

1 Rostral migratory stream (source area)

4 Callosal glioepithelium

5 Fornical glioepithelium

16 Subpial granular layer

3 Frontal stratified transitional field

Stem cells of the

choroid plexus?

Stem cells of the

choroid plexus?

Stem cells of the choroid plexus?

PLATE 205B