The Human Brain During the Third Trimester

In

te

rn

al

c

a

p

su

le

In

te

rn

al

c

a

p

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le

Lateral olfactory tract

L

at

er

al

(^) f
is
su
re
Lateral
fissu
re
In
sula
r g
yru
s
In
sula
r g
yru
s
IInnssuullaarr (^) ggyyrruuss
In
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r
(^) g
y
r
u
s
In
s
u
la
r
(^) g
y
r
u
s
Lateral ventricle
Choroid
plexus
Choroid
plexus
Crus I
ansiform lobule
(HVIIA)
Crus I
ansiform lobu le
(HVIIA)
Simp
lex^
lobu
le
(HV
Simple I)
x^ lob
ule
(HV
I)
FusifFusiform gyrusorm gyrus??
Superior
temporal gyrus?
Superior
temporal gyrus?
A
nt
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io
r
co
m
m
is
su
re
A
nt
er
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co
m
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BBA SAL GANGLIASAL GANGLIAA

CA1CA1

CA1CA1

Ba

so

la

ter

al

co

m

pl

ex

Ba

so

la

ter

al

co

m

pl

ex

Central

nucleus

Central

nucleus

A

M

Y

G

D

A

L

A

A

M

Y

G

D

A

L

A

PutamenPutamen

Ventral

striatum

Ve ntral

striatum

Lateral

geniculate

body

Lateral

geniculate

body

La

te

ra

l^ v

en

tr

icl

e

CEREBELLUM

(HEMISPHERE)

CEREBELLUM

(HEMISPHERE)

A

m

m

on

's^

ho

rn

A

m

m

on

's^

ho

rn

F

im

br

ia

F

im

br

ia

Fimbria/

fornix

Fimbria/

fornix

P

ar

ah

ip

p

oc

am

p

al

g

yr

us

P

ar

ah

ip

p

oc

am

p

al

g

yr

us

UncuUncuss

Endopirifor m

nucleus

Endopiriform

nucleus

Caudate

nucleus

(tail)

Caudate

nucleus

(tail)

Stria

terminalis

Stria

terminalis

Stria

terminalis

Stria

terminalis

C

la

us

tr

u

m

C

la

us

tr

u

m

Lateral migratory stream

(percolates through the endopiriform nucleus)

Lateral migratory stream

(percolates through the endopiriform nucleus)

Lateral migratory stream

(percolates through the claustrum)

Lateral migratory stream

(percolates through the claustrum)

E

x

t

e

r

n

a

l

c

a

p

s

u

le

E

x

t

e

r

n

a

l

c

a

p

s

u

le

U

n

c

i

n

a

t

e

f

a

s

c

i

c

u

l

u

s

U

n

c

i

n

a

t

e

f

a

s

c

i

c

u

l

u

s

Inferior
frontal
gyrus

Inferior
frontal
gyrus

Middle

frontal

gyrus

Middle

frontal

gyrus

Primary olfactory cortex (pirifPrimary olfactory cortex (piriform)orm)

Intercalated

masses

Intercalated

masses

FrFrontal lobeontal lobe

TTe mporal lobeemporal lobe

Caudate nucleus (tail)Caudate nucleus (tail)

Optic

tract

Optic

tract

HIPPOCAMPUHIPPOCAMPUSS

Lateral migratory stream

(extends to the amygdala)

Lateral migratory stream

(extends to the amygdala)

Amygdaloid glioepithelium/ependyma

External germinal layer

PPo sterior striatal neuroepithelium and subvosterior striatal neuroepithelium and subventricular zoneentricular zone

Subpial granular layer

Alvear

glioepithelium

Alve ar

glioepithelium

Stem cells of Stem cells of choroid plexuschoroid plexus Strionuclear glioepitheliuStrionuclear glioepitheliumm

Strionuclear glioepitheliuStrionuclear glioepitheliumm

FFo rnical glioepitheliuornical glioepitheliumm

FFi mbrial glioepitheliuimbrial glioepitheliumm

Pa rahippocampal neuroepithelium, subventricular zone,

and stratified transitional field

Orbital

gyrus

Orbital

gyrus

Germinal and transitional structures in italics

Parietal

lobe

Parietal

lobe

Occipital

lobe

Occipital

lobe

Parietal

lobe

Parietal

lobe

Paracentral

lobule

Paracentral

lobu le

Precentral sulcus

Damaged areas in section

Occipital stratified

transitional field

Occipital stratified

transitional field

Occipital

neuroepithelium

and subventricular

zone (thin)

Occipital

neuroepithelium

and subventricular

zone (thin)

Parietal neuroepithelium

and subventricular zone

(thick)

Pa rietal neuroepithelium

and subventricular zone

(thick)

Parietal stratified

transitional field

Pa rietal stratified

transitional field

PLATE 107B