The Human Brain During the Third Trimester

Amygdaloid glioepithelium/ependyma
Alve ar glioepithelium

Fornical

glioepithelium

In

te

r

n

a

l

c

a

p

s

u

le

(p

o

s

te

r

io

r

li

m

b)

Optic

tract

Optic

tract

Globus

pallidus

Globus

pallidus

Globus

pallidus

Globus

pallidus

Lateral olfactory tractLateral olfactory tract

L

a

te

ra

l

fi

ss

u

Orbital gyrusOrbital gyrus re

In

su

la

r

gy

ru

s

In

su

la

r

gy

ru

s

Lateral

ventricle

C

hor

oi

d

plexu

s

C

hor

oi

d

plexu

s

En

to

rh

in

al

co

rte

x

En

to

rh

in

al

co

rte

x

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)

Molecular layer

Purkinje cell layer

Granule cell layer

Medullary layer

AN

TE

RIO

R^ L

OB

E^ (

HI-

HV

)

AN

TE

RIO

R^ L

OB

E^ (

HI-

HV

)

Biventral

lobule

(HVIII)

Biventra l

lobu le

(HVIII)

Paramedian

lobule

(HVIIb)

Paramedian

lobu le

(HVIIb)

Anterior

commissu

re

Anterior

commissu

re

THALAMUSTHALAMUS

PulvinarPulvinar

Pulvina

r

Pulvina

r

POSTERIOR

COMPLEX

POSTERIOR

COMPLEX

Primary fissu re

BBA SAL GANGLIASAL GANGLIAA

CA1CA1

CA1CA1

CA1CA1

BasolateralBasolateralcomplexcomplex

Central

nucleus

Central

nucleus

Basal nucleus

of Meynert

Basal nucleus

of Meynert

A

M

Y

G

D

A

L

A

A

M

Y

G

D

A

L

A

PutamenPutamen

PutamenPutamen

Ventral

striatum

Ve ntral

striatum Lateral

geniculate

body

Lateral

geniculate

body

Inte

rna

l^ se

gm

ent

Inte

rna

l^ se

gm

ent

Exte

rna

l se

gm

ent

Exter

nal segm

ent

L

at

er

a

l^

ve

n

tr

ic

le

CEREBELLUM

(HEMISPHERE)

CEREBELLUM

(HEMISPHERE)

CA3CA3

CA3CA3

Am

m

on

's

h

or

n

Am

m

on

's

h

or

n

De

nta

te^

gy

ru

s

De

nta

te

gy

ru

s

Fimbri

a

Fimbri

a

Fimbria/

fornix

Fimbria/

fornix

PParahippocampal gyrusarahippocampal gyrus

UncuUncuss

Pr

im

ar

yol

factory

oc

tr

xe

p(

ri

fi

ro

m

)

Pr

im

ar

yol

factory

oc

tr

xe

p(

ri

fi

ro

m

)

Intercalated

masses

Intercalated

masses

Endopirifor m

nucleu s

Endopiriform

nucleu s

Ans

a le

ntic

ular

is

Ans

a le

ntic

ular

is

Co rCorona radiatona radiataa

Caudate

nucleus

(tail)

Caudate

nucleus

(tail)

Str

ia

ter

min

Stralis

ia

ter

min

alis

Dentate granular laDentate granular layeyerr

Dentate molecular laDentate molecular layeyerr

Dentate hiluDentate hiluss

Subgranular zoneSubgranular zone

Pyramidal laPyramidal layeyerr

Stratum lacunosum moleculaStratum lacunosum molecularree

Stratum radiatumStratum radiatum

Stratum orienStratum orienss

AlAlveusveus

SU

BS

TA

NT

IA IN

NO

MI

NAT

SU A

BS

TA

NT

IA IN

NO

MI

NAT

A

E

x

t

e

r

n

a

l

c

a

p

su

le

E

x

t

e

r

n

a

l

c

a

p

su

le

C

la

u

s

tr

u

m

C

la

u

s

tr

u

m

Lateral migratory stream

(percolates through the claustrum

and endopiriform nucleus)

Lateral migratory stream

(percolates through the claustrum

and endopiriform nucleus)

Lateral migratory stream

(extends to the amygdala)

HIPPOCAMPUHIPPOCAMPUSS

External germinal layer

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

Subpial granular layer

Fo rnical

glioepithelium

Strionuclear glioepitheliuStrionuclear glioepitheliumm

Occipital stratified

transitional field

Occipital neuro-

epithelium and

subventricular zone

(thin)

Pa rahippocampal neuroepithelium,

subventricular zone, and stratified transitional field

Pa rietal neuroepithelium

and subventricular zone

(thick)

Pa rietal stratified

transitional field

In

te

r

n

a

l

c

a

p

s

u

le

(p

o

s

te

r

io

r

li

m

b)

St

ri

a

te

rm

in

al

si

St

ri

a

te

rm

in

al

si

R

e

ti

c

u

la

r

n

u

cl

eu

s

R

e

ti

c

u

la

r

n

u

cl

eu

s

Lingula?Lingula?

Occipital

lobe

Occipital

lobe

Damaged areas in section

Germinal and transitional structures in italics

PLATE 106B