The Human Brain During the Third Trimester

2

Accumbent neuroepithelium

and subventricular zone

(intermingled with the source of

the rostral migratory stream)

Remnants of the germinal matrix,

migratory streams, and

transitional fields

9 External germinal layer (cerebellum)

6

Anteromedial striatal neuroepithelium

and subventricular zone

10 Subpial granular layer (cortical)

1 10

2

3

4

4

55

88

9

9

6 7

1 Rostral migratory stream

5 Fo rnical glioepithelium

7 Strionuclear glioepithelium

8

Pontine and medullary

glioepithelium/ependyma

4 Callosal glioepithelium

3

Rostral migratory stream

(source area)

Culmen

IV, V

Culmen

IV, V

Lingula

I, II

Lingula

I, II

Centralis

III

Centralis

III

Stria

terminalis

C

er

eb

r

al

p

e

d

u

n

cle

C

er

eb

r

al

p

e

d

u

n

cle

Su

bs

ta

nt

ia

(^) n
ig
ra
Su
bs
ta
nt
ia
(^) n
ig
ra
Op
tic^ t
ract
Op
tic^ t
ract
Globus
pallidus
Globus
pallidus
InterInternal capsulnal capsulee
Caudate nucleus
(head)
Caudate nucleus
(head)
Internal
capsule
Internal
capsule
Subthalamic
nucleus
Subthalamic
nucleus
Diagonal band of Broca
(vertical limb)
Orbital gyrus
Olfactory sulcus
Lateral ventricle
Ch
or
oi
d
pl
ex
us
Ch
or
oi
d
pl
ex
us
Choroid
plexus
Choroid
plexus
Corpus
callosum
(splenium)
Corpus
callosum
(splenium)
MIDBRAIMIDBRAINN
P O N SPO N S
PPrreetteeccttuumm
Inferior
colliculus
Inferior
colliculus
Reticular
formation
Reticular
fo rmation
Middle cerebellar peduncle
Entorhinal cortex
Fourth ventricle
(lateral recess
Fourth ventricle
(lateral recess
Floccular
peduncle
Floccular
peduncle
Superior
vestibular
nucleus
Superior
vestibu lar
nucleus
Dentate nucleusDentate nucleus
Crus I
ansiform lobule
(HVIIA)
Crus I
ansiform lobu le
(HVIIA)
Simplex lobule
(HVI)
Simplex lobu le
(HVI)
Crus II
ansiform lobule
(HVIIA)
Crus II
ansiform lobu le
(HVIIA)
TEGMENTUMTEGMENTUM
TECTUTECTUMM
Brachium of the inferior colliculus
Nucleus of the lateral lemniscus (dorsal)

C

in

gu

lu

m

C

in

gu

lu

m

Fasciola cinereum

C

or

p

u

s

ca

ll

os

um

(^) (
b
od
y)

C

or

p

u

s

ca

ll

os

um

(^) (
b
od
y)

F

or

n

ix

F

or

n

ix

Cingulate gyrus

(retrosplenial area)

Cingulate gyrus

(retrosplenial area)

Pa

ri

et

o-

oc

ci

pi

ta

l^ s

ul

cu

s

Primary

visual cortex

(in occipital lobe)

Primary

visual cortex

(in occipital lobe)

Lateral lemniscus

ANTERIOR LOBEANTERIOR LOBE

V E R M I SV E R M I S

Biventral

lobule

(HVIII)

Biventra l

lobu le

(HVIII) Paramedialobulen

(HVIIb)

Paramedian

lobu le

(HVIIb)

Dors

olater

al^ nu

cleus

Dors

olater

al^ nu

cleus

Paraflocculus

(tonsil, HIX)

Paraflocculus

(tonsil, HIX)

Superior

colliculus

Superior

colliculus

MEDULLAMEDULLA

Inferior

olive

(principal

nucleus)

Inferior

oliv e

(principal

nucleus)

DO

RSA

L^ C

OM

PL

EX

DO

RSA

L^ C

OM

PL

EX

Centromedian

nucleus

Centro median

nucleus

Be

d^ n

ucl

eu

s^ o

f^ th

e

str

ia^ t

er

min

ali

s

Be

d^ n

ucl

eu

s^ o

f^ th

e

str

ia^ t

er

min

ali

s

Forel's

fields

Fo rel's

fields

Olfactory

tubercle

Olfactory

tubercle

Nucleus

accumbens

Nucleus

accumbens

Anterior

com

missu

re

Anterior

com

missu

re

C

en

tr

al

la

te

ra

ln

uc

le

us

C

en

tr

al

la

te

ra

ln

uc

le

us

C

E

N

T

R

A

L

C

O

M

P

L

E

X

C

E

N

T

R

A

L

C

O

M

P

L

E

X

THALAMUSTHALAMUS

Su

bst

antia

innomi

nata

Su

bst

antia

innomi

nata

R

et

ic

u

la

r

nu

cl

eu

s

R

et

ic

u

la

r

nu

cl

eu

s

R

E

T

I

C

U

L

A

R

B

E

L

T

R

E

T

I

C

U

L

A

R

B

E

L

T

Ventral

anterior

nucleus

Ve ntral

anterior

nucleus

Ventral

lateral

nucleus

Ve ntral

lateral

nucleus Ventral

posterolateral

nucleus

Ve ntral

posterolateral

nucleus

V

en

tr

al

(^) p
os
te
ro
m
ed
ia
l
nu
cl
eu
s
V
en
tr
al
(^) p
os
te
ro
m
ed
ia
l
nu
cl
eu
s
PulvinarPulvinar

VENTRAL COMPLEXVENTRAL COMPLEX

VENTRAL

COMPLEX

VENTRAL

COMPLEX

POSTERIOR

COMPLEX

POSTERIOR

COMPLEX

Primary fissu re

In

fe

r

io

r

ce

re

b

el

la

r

pe

du

nc

le

In

fe

r

io

r

ce

re

b

el

la

r

pe

du

nc

le

Spinal

nucleus

(V)

Spinal

nucleus

(V)

Pri

ncip

al^ se

nso

ry

nuc

leus

(V

)

Pri

ncip

al^ se

nso

ry

nuc

leus

(V

M )

oto

r^ n

ucle

us (V

)

Mo

tor

nu

cle

us (V

)

Motor nucleus (VII)?

Superior cerebellar peduncle

H E

M I S P

H

E

R

E

H E

M I S P

H

E

R

E

BBA SAL GANGLIASAL GANGLIAA

Pontocerebellar fibers

(thin transverse bundles)

Transpontine corticofugal tract

(thick longitudinal bundles)

PPontine grayontine gray

Stem cells of choroid plexus

Stem cells of

choroid plexus

Stem cells of

choroid plexus

Damaged areas in section

C E R E B E L L U M

PLATE 104B