The Human Brain During the Third Trimester

AMYGDALA

L

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ra

lv

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tri

cle

FFrroonnttaall^ lloobbee

Interhemispheric

fissure

White matter

Cortical plate

Layer I

Cingulate

gyrus

Cingulate

gyrus

HYPO-

THALAMUS

HYPO-

THALAMUS

AMYGDALA

BASAL

GANGLIA

BA SAL

GANGLIA

C

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(^) n
u
c
le
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)
C
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)
TTe mporal lobeemporal lobe
Lateral fissure
Inte
rnal capsule (anterior limb)
Inte
rn
al capsule (anterior limb)
PutamenPutamen
Inferior temporal
gyrus
Inferior temporal
gyrus
Inferior frontal
gyrus
Inferior frontal
gyrus
Callosal glioepithelium
Lateral migratory stream
(infiltrates claustrum and
penetrates insular cortex)
Lateral migratory stream
(infiltrates claustrum and
penetrates insular cortex)
Lateral migratory stream
(extends to amygdala)
Lateral migratory stream
(extends to amygdala)
Lateral migratory stream
(extends to temporal neocortex)
Lateral migratory stream
(extends to temporal neocortex)
Ventral
striatum
Ve ntral
striatum

C

in

gu

lu

m

C

in

gu

lu

m

Induseum

griseum

Lateral

hypothalamic

area

Lateral

hypothalamic

area

Para-

ventricular

nucleus

Para -

ventricular

nucleus

Supraoptic

nucleus

Supraoptic

nucleus

ArArcuate nucleucuate nucleuss

Lateral

olfactory tract

G

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p

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(in

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G

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p

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(in

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a

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t)

G

lo

b

us pallidus

(exter

nal segm

ent)

G

lo

bu

s pallidus

(exter

nal segm

ent)

Cave of the

septum

Cave of th e

septum

Stria

terminalis

Stria

terminalis

Uncinate

fasciculus

Uncinate

fasciculus

I

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l

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y

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u

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I

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C

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InterIntercalated massescalated masses

Nuc. of the lateral

olfactory tract?

Nuc. of the lateral

olfactory tract?

Basal nuc.

of Meynert

Basal nuc.

of Meynert

Medial

nucleus

Medial

nucleus

Central

nucleus

Central

nucleus

Basal

nucleus

Basal

nucleus

Lateral

nucleus

Lateral

nucleus

Cortical nucleiCortical nuclei

Abnormal

hemorrhage in the

germinal matrix

Abnormal

hemorrhage in the

germinal matrix

FFornixornix

FFornixornix

Anterior

commissure

Anterior

commissure

CCoorrppuussccaalllloossuumm((bbooddyy))

M

ed

ial

fo

re

br

ain

bu

nd

le

M

ed

ial

fo

re

br

ain

bu

nd

le

O

ptic tr

a

ct

O

ptic

tr

a

ct

E

x

te

r

n

a

l

c

a

p

s

u

el

E

x

te

r

n

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l

c

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u

el

L

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ra

lv

en

tri

cle

Be

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nu

cl

eu

so

f

th

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st

ri

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in

al

is

Be

d

nu

cl

eu

so

f

th

e

st

ri

a

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r

m

in

al

is

M

e

d

u

ll

ar

y

la

m

in

a

M

e

d

u

ll

ar

y

la

m

in

a

Ansa

len

tic

ul

ar

is

Ansa

len

tic

ul

ar

is

Substa

ntia

in

nom

inata

Substa

ntia

in

nom

inata

Stria

medullaris

Stria

medullaris

Subfornical

organ

Subfornical

organ

Third Third ventricleventricle

F

or

am

en

o

f

M

o

n

ro

FFr ontal stratified transitional fieldrontal stratified transitional field

Frontal neuroepithelium

and subventricular zone

Fr ontal neuroepithelium

and subventricular zone

Fornical

glioepithelium

Fo rnical

glioepithelium

Choroid plexus

stem cells?

Choroid plexus

stem cells?

Choroid

plexus

Choroid

plexus

Fusiform

gyrus

Fusiform

gyrus

Middle temporal

gyrus

Middle temporal

gyrus

Superior temporal

gyrus

Superior temporal

gyrus

Parolfactory/

parahippocampal

gyrus

Parolfactory/

parahippocampal

gyrus

Pa rahippocampal stratified transitional field (intermingled

with the amygdaloid glioepithelium/ependyma)

Anterolateral striatal neuroepithelium

and subventricular zone

Anterolateral striatal neuroepithelium

and subventricular zone

Anteromedial striatal neuroepithelium

and subventricular zone

Anteromedial striatal neuroepithelium

and subventricular zone

Glioepithelium

(optic tract)

Hypothalamic

glioepithelium/

ependyma

Hypothalamic

glioepithelium/

ependyma

Thalamic

glioepithelium/

ependyma

Thalamic

glioepithelium/

ependyma

Strionuclear glioepitheliuStrionuclear glioepitheliumm

Germinal and transitional structures in italics

Subpial granular layer

Migratory waves

(from the lateral

migratory stream accumulate

in the lateral nucleus)

Migratory waves

(from the lateral

migratory stream accumulate

in the lateral nucleus)

Callosal slingCallosal sling

PLATE 177B