The Human Brain During the Third Trimester

33

44

55

66

77

88

22

11

11

1 Rostral migratory stream

2

Fr ontal stratified transitional field (intermingled

with the source of the rostral migratory stream)

3 Fr ontal stratified transitional field

4 Callosal glioepithelium

5 Fo rnical glioepithelium

8 Strionuclear glioepithelium

9 Germinal trigone (cerebellum)

10 External germinal layer (cerebellum)

6

Anterolateral striatal neuroepithelium

and subventricular zone

7

Anteromedial striatal neuroepithelium

and subventricular zone

Zona incerta

Cingulate sulcus

Ventral

lateral

nucleus

Ventral

lateral

nucleus

Do

rso

late

ral

nuc

leus

Do

rso

late

ral

nuc

leus

eC

tn

ar

ll

ta

er

al

n

uc

le

us

eC

tn

ar

ll

ta

er

al

n

uc

le

us

THALAMUSTHALAMUS

SUBTHALAM

US

SUBTHALAM

US

BBA SAL GANGLIASAL GANGLIAA

MIDBRAIN

TEGMENTUM

MIDBRAIN

TEGMENTUM

A

nt

er

ov

en

tr

al

nu

cl

eu

s

A

nt

er

ov

en

tr

al

nu

cl

eu

s

Ventral

anterior

nucleus

Ventral

anterior

nucleus

Ventral

postero-

lateral

nucleus

Ventral

postero-

lateral

nucleus

Ventral

posteromedial

nucleus

Ve ntral

posteromedial

nucleus

PulvinarPulvinar

Centromedian

nucleus

Centromedian

nucleus

R

e

ti

c

u

la

r

nu

cl

eu

s

R

e

ti

c

u

la

r

nu

cl

eu

s

AmygdalAmygdalaa

SUBSTANTIA

INNOMINATA

SUBSTANTIA

INNOMINAT A

Optic tractOptic tract

Ventral

hippocampus

Ve ntral

hippocampus

Ent

orh

ina

corte l

x

Ent

orh

ina

corte l

x

Zona incerta

DDentate nucleusentate nucleus

Ventral cochlear

nucleus

Ventral cochlear

nucleus

Dorsal cochlear

nucleus

Dorsal cochlear

nucleus

NeNerve Vrve V

Primary

visual

cortex

Primary

visual

cortex

An

ter

ior

lo

be

(H

I-H

V)

An

ter

ior

lo

be

(H

I-H

V)

Simplex

lobule

(HVI)

Simplex

lobu le

(HVI)

Floccular

peduncle

Floccular

peduncle

C

ru

s

I

a

n

sif

o

r

m

lo

b

u

le

(H

V

II

A

)

C

ru

s

I

a

n

sif

or

m

lo

b

u

le

(H

V

II

A

)

C

ru

s^

II

a

n

si

fo

rm

l

ob

u

le

(H

V

I

IA

)

C

ru

s^

II

a

n

si

fo

rm

l

ob

u

le

(H

V

I

IA

)

Paramedian lobule

(HVIIB)

Paramedian lobule

(HVIIB)

Biven

tral lo

bule

(HVII

Biven I)

tral lo

bule

(HVII

I)

Paraflocculus

(tonsil)(HIX)

Paraflocculus

(tonsil)(HIX)

Cingulate gyrus

(retrosplenial area)

Cingulate gyrus

(retrosplenial area)

Fasciola

cinereum

Fa sciola

cinereum

Cingulate sulcus

PrPrecuneusecuneus

Internal

capsule

Internal

capsule

Internal

capsule

Internal

capsule

Stria

terminalis

Stria

terminalis

Nucleus

accumbens

Nucleus

accumbens

Orbital

gyrus

Orbital

gyrus

G

lo

b

u

s^

p

a

ll

id

u

s

(i

n

te

r

n

a

l

se

g

m

en

t)

G

lo

b

u

s^

p

a

ll

id

u

s

(i

n

te

r

n

a

l

se

g

m

en

G t)

lo

b

u

s

p

a

ll

id

u

s

(e

x

te

r

n

a

l^

s

eg

m

e

n

t)

G

lo

b

u

s

p

a

ll

id

u

s

(e

x

te

r

n

a

l^

s

eg

m

e

n

t)

FFornixornix

Subthalamic

nucleus

Subthalamic

nucleus

Brachium of

inferior colliculus

Nerve VIII

root?

Nerve V root

(premyelination gliosis)

Calcarine

fissure

Primary

fissure

Anterio

r lim

b

Anterio

r lim

b

Posterior lim

b

Po

sterior lim

b

Olfactory

tubercle

Olfactory

tubercle Basal nucleus

of Meynert

Basal nucleus

of Meynert

PutamenPutamen

Lateral ventricl

e

Caudate nucleus

(body)

Caudate nucleus

(body)

Corp

us (^) ca
llosum
(bod
y)
Corp
us (^) ca
llosum
(bod
y)
Pa
rieto-occipital sulcus
Corpus
callosum
(splenium)
Corpus
callosum
(splenium)
PParietal lobearietal lobe
Occipital lobeOccipital lobe
Substantia
nigra
Substantia
nigra
CeCerrebral peduncleebral peduncle
In
fe
ri
or
ce
re
be
lla
r
pe
du
nc
le
In
fe
ri
or
ce
re
be
lla
r
pe
du
nc
le
Midd
lecerebel
la
r
p
de
nu
elc
Midd
lecerebel
la
r
p
de
nu
elc
Olfactory bu lb Islands of Calleja

E

x

te

rn

a

l

ca

p

su

le

E

x

te

rn

a

l

ca

p

su

le

H

E

M

I

S

P

H

E

R

E

H

E

M

I

S

P

H

E

R

E

H

E

M

IS

PHE R

E

H

E

M

IS

PHE R

E

Choroid

plexus

Choroid

plexus

Choroid

plexus

Choroid

plexus

99

10

Remnants of the germinal matrix, migratory streams, and transitional fields

Angular gyrusAngular gyrus??

C

E

R E B E

L

L

U

M

PLATE 58B