The Human Brain During the Third Trimester

Inte

rnal

ca

psu

le

Inte

rnal

ca

psu

le

GW26 Sagittal

CR 225 mm

Y147-63

Level 6: Section 361

Nerve V (root)

Lateral ve ntricle

Olfactory tubercle

Su

bstan

tia

inn

om

inata

Su

bstan

tia

inn

om

inata

Primary olfactory cortex (piriform)

Primary Primary ffissuissurree

Parieto-

occipital

sulcus

Middle cerebellar peduncle

Dorsal cochlear nucleus

Ve ntral cochlear nucleus?

Inferior cerebellar peduncle

ThalamusThalamus

Paraflocculus

Flocculus

Orbital gyrusOrbital gyrus

Parietal

lobe

Parietal

Frontal lobe

lobe

Frontal

lobe

Paracen

tral^ lobu

le

Paracen

tral^ lobu

le

Frontal

lobe

Frontal

lobe

Sp

len

iu

m

Sp

len

iu

m

BBaassaall ggaanngglliiaa

Nucleus

accumb

ens

Nucleus

accumb

ens

Ventral

hippocampus

Ventral

hippocampus

Dorsal

hippo-

campus

Dorsal

hippo-

campus

Occipital

lobe

Occipital

lobe

Cortical plate

White matter

L

at

e

ra

l^

ve

n

tr

ic

le

Cere bellum

(hemisphere )

AnteriorAnteriorlobelobe

Dentate

nucleus

Dentate

nucleus

Simpl

lobuex

le

Simpl

lobuex

le

Ansiform

lobule

(crus II)

Ansiform

lobu le

(crus II)

Biventral lobule

Paramedian lobule

Ansiform

lobule

(crus I)

Ansiform

lobu le

(crus I)

11

22

33

44

44

55

66

88

99

1111

1212

1010

1313

1414

1515

15

1616

1616

1616

77

C

or

pu

sc

all

osu

m

C

or

pu

sc

all

osu

m

Cingulate gyrusCingulate gyrus

Ci

ng

ula

te^

gy

rus

(re

tro

sp

len

ial

ar

ea

)

Ci

ng

ula

te^

gy

rus

(re

tro

sp

len

ial

ar

ea

)

SubthalamusSubthalamus

En

tor

hin

al

cor

Entotex

rhin

al

cor

tex

CENTRAL

COMPLEX

CENTRAL

COMPLEX

Central sulcus

Calcarine sulcuCalcarine sulcuss

Primary visual

cortex

Primary visual

cortex

For

nix

Forn

ix

Globus

pallidus

Globus

pallidus

C

au

da

te

C

au

da

te

A

m

yg

da

la

A

m

yg

da

la

PO

ST

ER

IO

R

C

O

M

P

EL

X

PO

ST

ER

IO

R

C

O

M

P

EL

X

V

EN

TR

AL

CO

MPLEX

V

EN

TR

AL

CO

MPLEX

C

o

ro

n

a

ra

d

ia

ta

C

o

ro

n

a

ra

d

ia

ta

C

er

ebr

alpedu

ncl

e

C

er

ebr

alpedu

ncl

e

Pa

ra

hi

pp

oc

am

pa

l^ g

yr

us

Pa

ra

hi

pp

oc

am

pa

l^ g

yr

us

DORSA

L

COMP

DORLEX

SAL

COMP

LEX

Choroid

plexus

Choroid

plexus

9 Alve ar glioepithelium

10 Subgranular zone (dentate)

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

Pa rahippocampal neuroepithelium, subventricular

zone, and stratified transitional field

2 Fr ontal neuroepithelium and subventricular zone

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

15 External germinal layer (cerebellum)

14 Strionuclear glioepithelium

1 Rostral migratory stream (source area)

4 Callosal glioepithelium

5 Fo rnical glioepithelium

16 Subpial granular layer (cortical)

3 Fr ontal stratified transitional field

Layer I

Damaged areas in section

See detail of brain core and

cerebellum in Plates 205A and B.

Tem

pora

l

lob

Tem e

pora

l

lob

e

PLATE 195