The Human Brain During the Third Trimester

Amygdaloid glioepithelium/ependyma

Anterolateral

striatal neuroepithelium

and subventricular zone

External germinal

layer

Anterolateral striatal neuroepithelium

and subventricular zone

Anteromedial striatal neuroepithelium

and subventricular zone

Subpial granular layer

Fr ontal neuroepithelium,

subventricular zone, and

stratified transitional field

Fornical

glioepithelium

Fo rnical

glioepithelium

Stem cells of

choroid plexus

Stem cells of

choroid plexus

Alve ar glioepithelium

Lateral migratory stream?Lateral migratory stream?

Subgranular zone

Strionuclear glioepithelium

Pa rahippocampal neuroepithelium, subventricular zone,

and stratified transitional field

Callosal glioepithelium

Ce

rebral peduncle

Ce

rebral peduncle

Substantia nigraSubstantia nigra

Optic trac

t

Optic trac

t

Globus

pallidus

Globus

pallidus

Globus

pallidus

Globus

pallidus

In

te

r

n

a

l

ca

p

su

le

In

te

rn

a

l

ca

p

su

le

Caudate nucleus

(head)

Caudate nucleus

(head)

Caudate nucleus

(body)

Caudate nucleus

(body)

Sub

thal

nuc amic

leus

Sub

thal

nuc amic

leus

Primary olfactory

cortex (piriform)

Primary olfactory

cortex (piriform)

Lateral

olfactory tract

Orbital gyrusOrbital gyrus

Lateral ventricle

Choroid

plexus

Choroid

plexus

Corpus

callosum

(splenium)

Corpus

callosum

(splenium)

En

to

rh

ina

l c

or

tex

En

to

rh

ina

l c

or

tex

Sub

iculu

m

Sub

iculu

m

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)

MIDBRAIN

TEGMENTUM

MIDBRAIN

TEGMENTUM

Brachium of the inferior colliculus

Optic tract

F

or

ni

x

Fornix

Parieto-occipital sulcus

Primary visual cortex

(in occipital lobe)

A

N

T

E

R

IO

R

L

O

B

E

(H

I-

H

V

)

A

N

T

E

R

IO

R

L

O

B

E

(H

I-

H

V

)

Biventral

lobule

(HVIII)

Biventra l

lobu le

(HVIII)

Biventral

lobule fragments?

Biventra l

lobu le fragments?

Paramedian

lobule

(HVIIb)

Paramedian

lobu le

(HVIIb)

Paraflocculus

(tonsil, HIX)

Paraflocculus

(tonsil, HIX)

Flocculus

(HX)?

Flocculus

(HX)?

Flocculus

(HX)?

Flocculus

(HX)?

Anterior

commissure

Anterior

commissure

THALAMUSTHALAMUS

R

et

ic

ul

ar

n

uc

le

us

R

et

ic

ul

ar

n

uc

le

us

R

E

T

IC

U

L

A

R

B

EL

T

R

E

T

IC

U

L

A

R

B

EL

T

Ventral

anterior

nucleus

Ve ntral

anterior

nucleus

Ventral

lateral

nucleus

Ve ntral

lateral

nucleus

Ventral

posterolateral

nucleus

Ve ntral

posterolateral

nucleus

PulvinarPulvinar

VENTRAL COMPLEXVENTRAL COMPLEX

POSTERIOR

COMPLEX

POSTERIOR

COMPLEX

Primary fissu re

BBA SAL GANGLIASAL GANGLIAA incertaincertaZonaZona

SUBSTSUBSTANTIA INNOMIANTIA INNOMINNATAATA

Basolateral

complex

Basolateral

complex

C

or

tic

om

ed

ia

l

co

m

ple

x

C

or

tic

om

ed

ia

l

co

m

ple

x

Central

nucleus

Central

nucleus

Amygdalo-

hippocampal

area

Amygdalo-

hippocampal

area

AMYGDAMYGDALAALA

VENTRAL

HIPPOCAMPUS

VENTRAL

HIPPOCAMPUS

PutamenPutamen

Ventral

striatum

Ve ntral

striatum

In

te

rn

al^

ca

ps

ul

e

(a

nt

er

io

r^

lim

b)

In

te

rn

al^

ca

ps

ul

e

(a

nt

er

io

r^

lim

b)

Ventral

medial

nucleus

Ve ntral

medial

nucleus

Medial

geniculate

body

Medial

geniculate

body

Supra-

geniculate

nucleus

Supra-

geniculate

nucleus

DORSAL

HIPPOCAMPUS

DORSAL

HIPPOCAMPUS

InterInternal segmentnal segment

ExterExternal segmentnal segment

nI

te

rn

al

ca

ps

ul

e

(p

os

te

rio

rl

im

b)

nI

te

rn

al

ca

ps

ul

e

(p

os

te

rio

rl

im

b)

Ventral

posteromedial

nucleus

Ve ntral

posteromedial

nucleus

L

a

te

ra

l v

en

tr

ic

le

Exte

capsulernal

External

capsule

CEREBELLUM

(HEMISPHERE)

CEREBELLUM

(HEMISPHERE)

Dentate gyrusDentate gyrus

Ammon's horAmmon's hornn

Stria termnalisStria termnalis

Germinal and transitional

structures in italics

Damaged areas in section

Rostral migratory stream

(source area)

PLATE 105B