The Human Brain During the Third Trimester

FFrroonnttaall^ lloobbee

Interhemispheric

fissure

White matter

Layer I

Cingulate

gyrus

Cingulate

gyrus

Induseum

griseum

Induseum

griseum

Lateral

ventricle

C

au

d

at

e^

n

uc

le

us

(b

od

y

)

C

au

d

at

e^

n

uc

le

us

(b

od

y

)

External

capsule

External

capsule

TTe mporal lobeemporal lobe

Lateral

fissure

PutamenPutamen

C

laustrum

C

laustrum

Claustru

m

Claustru

m

Co

rp

usca

llosum(body)

Co

rp

usca

llosum(body)

FFornixornix

FFornixornix

I

n

s

u

la

r

g

y

r

u

s

I

n

s

u

la

r

g

y

r

u

s

Optic

chiasm

Optic

chiasm

Third

ventricle

Stria

terminalis

G

lo

b

u

s

p

a

ll

id

u

s

(e

x

te

rn

a

l

se

g

m

e

n

t)

G

lo

b

u

s

p

a

ll

id

u

s

(e

x

te

rn

a

l

se

g

m

e

n

t)

Globus pallidus

(internal segment)

Globus pallidus

(internal segment)

Lateral

preoptic area

Lateral

preoptic area

Medial

preoptic

area

Medial

preoptic

area

Perive ntricular

preoptic nucleus

Suprachiasmatic

nucleus

Sexually

dimorphic nucleus

Magnocellular

preoptic nucleus

Magnocellular

preoptic nucleus SUBSTANTIA

INNOMINATA

SUBSTANTIA

INNOMINAT A

ChorChoroid plexusoid plexus

Endopiriform

nucleus

Endopiriform

nucleus

Endopiriform

nucleus

Endopiriform

nucleus

Ventral

striatum

Ve ntral

striatum

A

nt

eri

or

com

missure

A

nt

eri

or

com

missure

Subfornical

orga n

CingulumCingulum

La

ter

al^ o

lfac

tor

y^ tr

act

Medial

forebrain

bundle?

Pri

mar

yolf

ac

to

r

y

oc

tr

xe

P(

ri

ofi

mr

)

Pri

mar

yolf

ac

to

r

y

oc

tr

xe

P(

ri

ofi

mr

)

LaLayer IIyer II

LaLayer yer II

LaLayers III-IVyers III-IV

Primary

olfactory

cortex

Primary

olfactory

cortex

Cortical plate

BBA SAL GANGLIASAL GANGLIAA

PREOPTIC

AREA

PREOPTIC

AREA

Bed nucleus of

the stria terminalis

Bed nucleus of

the stria terminalis

Olfactory

tubercle

Olfactory

tubercle

Inferior

temporal gyrus

Inferior

temporal gyrus

Frontal neuroepithelium Cave of the septum

and subventricular zone

Fr ontal neuroepithelium

and subventricular zone

Frontal stratified

transitional field

Fr ontal stratified

transitional field

Anteromedial striatal

neuroepithelium and

subventricular zone

Anterolateral striatal

neuroepithelium and

subventricular zone

Strionuclear

glioepithelium

Subpial

granular

layer

Callosal slinCallosal slingg

Callosal glioepitheliuCallosal glioepitheliumm

Uncinate

fasciculus

Uncinate

fasciculus

Inte

r

nal capsule (anterior limb)

Inte

rnal capsule (anterior limb)

Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics

Preoptic glioepithelium/ependymaPreoptic glioepithelium/ependyma

Lateral migratory stream

(infiltrates claustrum and

endopiriform nucleus)

Lateral migratory stream

(infiltrates claustrum and

endopiriform nucleus)

Lateral migratory stream

(extends toward

olfactory tubercle)

Lateral migratory stream

(extends toward

olfactory tubercle)

Lateral migratory stream

(extends into the temporal lobe)

Lateral migratory stream

(extends into the temporal lobe)

Superior

temporal

gyrus

Inferior

frontal

gyrus

Fornical

glioepithelium

Fo rnical

glioepithelium Stem cells of

choroid plexus

PLATE 33B