The Human Brain During the Third Trimester

Ventral

striatum

Ve ntral

striatum

Globu

s pallid

us

(intern

al

segme

nt)

Globu

s pallid

us

(inter

nal

segme

nt)

Globus pallidus

(external segment)

Globus pallidus

(external segment)

PutamenPutamen

SUBSTANTIA

INNOMINATA

SUBSTANTIA

INNOMINAT A

Basal nucleus

of Meynert

Basal nucleus

of Meynert

Anterior commissuAnterior commissurree

C

la

u

st

r

u

m

C

la

u

st

r

u

m

E

xt

er

n

al

c

ap

su

le

E

xt

er

n

al

c

ap

su

le

BBA SAL GANGLIASAL GANGLIAA

Primary olfactory

cortex (piriform)

Primary olfactory

cortex (piriform)

Lateral

cortical

nucleus

Lateral

cortical

nucleus

Central

nucleus

Central

nucleus

Basolateral

nuclear complex

Basolateral

nuclear complex

Medial

nucleus

Medial

nucleus

Orbital

gyrus

Orbital

gyrus

L

at

er

al

v

en

tr

ic

le

Anterior

amygdaloid

area

Anterior

amygdaloid

area

I

n

s

u

l

a

r

g

y

r

u

s

I

n

s

u

l

a

r

g

y

r

u

s

L

a

t

e

r

a

l

f

i

s

s

u r e

L

a

t

e

r

a

l

f

i

s

s

u r e

Un

cin

fasci ate

cu

lus

Un

cin

fasci ate

cu

lus

AMYGDAMYGDALAALA

Entorhinal cortexEntorhinal cortex

Dentate

gyrus

Dentate

gyrus

Ammon's horAmmon's hornn

Sub

icul

um

Sub

icul

VENTRAL um

HIPPOCAMPUS

VENTRAL

HIPPOCAMPUS

Optic tractOptic tract

Lateral

geniculate

body

Lateral

geniculate

body

Internal

capsule

Internal

capsule

T

HALAMUS

T

HALAMUS

PulvinarPulvinar

R

et

icu

lar

nuc

leus

R

et

icu

lar

nuc

leus

V

isu

al ra

diation

V

isu

al ra

diation

Stria

terminalis

Stria

terminalis

Ventral

postero-

lateral

nucleus

Ventral

postero-

lateral

nucleus

Posterior lim

b

Posterior lim

b

Lateral vLateral ventricleentricle

DORSAL

HIPPOCAMPUS

DORSAL

HIPPOCAMPUS

FFimimbbrriaia Choroid

plexus

Choroid

plexus

Choroid

plexus

Choroid

plexus

Caudate nucleus (tail)Caudate nucleus (tail)

CoCorrona radiatona radiataa

Inferior frInferior frontal gyrusontal gyrus

FFornixornix

Co

rpu

s ca

llosu

m (b

ody

)

Co

rpu

s ca

llosu

m (b

ody

)

Endopiriform

nucleus

Endopiriform

nucleus

FusifFusiform gyrusorm gyrus??

Occipital

gyrus

Occipital

gyrus

Occipital

gyrus

Occipital

gyrus

Pa

ra

hip

po

ca

m

pa

l g

yru

s

Pa

ra

hip

po

ca

m

pa

l g

yru

s

Pa

rie

to-

oc

cip

ita

l

sul

cus

Pa

rie

to-

oc

cip

ita

l

sul

cus

BiBiventral lobule (HVIII)ventral lobule (HVIII)

Pa

r a

me

di

an

(^) l
ob
ul
e
(H
VI
IB
)
Pa
r a
me
di
an
(^) l
ob
ul
e
(H
VI
IB
)
Crus^ I, ansiform lobule
(HVIIA)
Crus^ I, ansiform lobule
(HVIIA)
Crus II
ansiform lobule
(HVIIA)
Crus II
ansiform lobu le
(HVIIA)
A
n t
e r
i o
r^
l o
b e
( H
I -
H
V
)
A
n t
e r
i o
r^
l o
b e
( H
I -
H
V
)
Primary
fissure
CEREBELLUM HEMISPHERECEREBELLUM HEMISPHERE
Medullary
lamina
Medullary
lamina
1 Callosal glioepithelium
2 Fo rnical glioepithelium
4 Alve ar glioepithelium
5 Subgranular zone (dentate)
3
Pa rahippocampal neuroepithelium, subventricular zone,
and stratified transitional field
6 Lateral migratory stream (cortical)
9 Strionuclear glioepithelium
Remnants of the germinal matrix, migratory streams, and transitional fields
10 External germinal layer (cerebellum)
7 Amygdaloid glioepithelium/ependyma
8 Po sterior striatal neuroepithelium and subventricular zone
11 Subpial granular layer (cortical)
11
2
33
33
77
88
99
99
10
11
44 55
5
66
66
Stria
terminalis
Stria
terminalis
PLATE 61B