The Human Brain During the Third Trimester

9

Accessory

basal nucleus

Lateral Lateral ventriclventriclee

SU

BT

HA

LA

MU

S

SU

BT

HA

LA

MU

S

MIDBRAIN

TEGMENTUM

MIDBRAIN

TEGMENTUM

SUBSTANTIA

INNOMINATA

SUBSTANTIA

INNOMINAT A Optic tract

En

tor

hin

al

cor

Ent tex

orh

ina

l

cor

tex

Subthalamic

nucleus

Subthalamic

nucleus

Basal nucleus

of Meynert

Basal nucleus

of Meynert

Substantia

nigra

Substantia

nigra

CeCerrebral peduncleebral peduncle

Ventral

lateral

nucleus

Ventral

lateral

nucleus

THALAMUSTHALAMUS

Ventral

postero-

lateral

nucleus

Ventral

postero-

lateral

nucleus

PulvinarPulvinar

Medial

geniculate

body

Medial

geniculate

body

R

e

ti

cu

la

r

nu

cl

eu

s

R

e

ti

cu

la

r

nu

cl

eu

s

Brachium of

inferior colliculus

Su

pr

a-

ge

ni

cu

la

te

nu

cl

eu

s

Su

pr

a-

ge

ni

cu

la

te

nu

cl

eu

s

Zona

incer

ta

Zona

incer

ta

Ansa

lenticularis

Ansa

lenticularis

Ento-

peduncular

nucleus?

Ento-

peduncular

nucleus?

VVe ntral striatuentral striatumm

Primary olfactory

cortex (piriform)

Primary olfactory

cortex (piriform)

Anterior

amygdaloid

area

Anterior

amygdaloid

area

Amygdalo-

hippocampal

area

Amygdalo-

hippocampal

area

Dentate

gyrus

Dentate

gyrus

Anterior commissuAnterior commissurree

Endopiriform

nucleus

Endopiriform

nucleus

Internal

capsule

Internal

capsule

Internal

capsule

Internal

capsule

G

lo

b

u

s^

p

a

ll

id

u

s

(i

n

te

rn

a

l

se

g

m

en

t)

G

lo

b

u

s^

p

a

ll

id

u

s

(i

n

te

rn

a

l

se

g

m

en

G t)

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

en

t)

AAnnteterrioiorr lim limbb

Po

ste

rio

r^ l

im

b

Po

ste

rio

r^ l

im

b

Stria

terminalis

Stria

terminalis

PutamenPutamen

PutamenPutamen

Caudate nucleus

(body)

Caudate nucleus

(body)

Lateral Lateral ventricleventricle

Ammon's horAmmon's hornn

SubiculuSubiculumm

VENTRAL

HIPPOCAMPUS

VENTRAL

HIPPOCAMPUS

DORSAL

HIPPOCAMPUS

DORSAL

HIPPOCAMPUS

Fim

br

ia

Fim

br

ia

Orbital

gyrus

Orbital

gyrus

FFornixornix

E

x

et

r

n

a

l

c

a

p

su

le

E

x

et

r

n

a

l

c

a

p

su

le

Choroid

plexus

Choroid

plexus

Primary

visual

cortex

Primary

visual

cortex

P

a

rie

to

• o

c

cip

ita

l

su

lc

u

s

Occipital lobeOccipital lobe

BBA SAL GANGLIASAL GANGLIAA

Cor

pus

ca

llosu

m^ (

bod

y)

Cor

pus

ca

llosu

m^ (

bod

y)

Dentate nucleusDentate nucleus

Choroid

plexus

Choroid

plexus

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

)

Simplex

lobule

(HVI)

Simplex

lobu le

(HVI)

Primary fissure

Bive

ntra

l^ lob

ule

(HV

Bi III)

vent

ral^

lobu

le

(HV

III)

Mid

dle

cere

bella

r^ ped

uncl

Middle e

cere

bella

r^ ped

uncl

e

AMYGDAMYGDALAALA

H

E

M

I

S

P

H

E

R

E

H

E

M

I

S

P

H

E

R

E

Cingulate gyrus

(retrosplenial area)

Cingulate gyrus

(retrosplenial area)

Med

ial

nu

lc

ue

s

Med

ial

nu

lc

ue

s

A

n

et

ri

or

co

tr

ic

al

(^) n
uc
le
us
A
n
et
ri
or
co
tr
ic
al
(^) n
uc
le
us
Accessory
basal nucleus

B

a

sa

l

n

u

c

le

u

s

B

a

sa

l

n

u

c

le

u

s

1

11

1 Callosal glioepithelium

2

2 Fo rnical glioepithelium

33

3 Alve ar glioepithelium

44

44

4 Subgranular zone (dentate)

55

5 Lateral migratory stream (cortical)

88

9 Strionuclear glioepithelium

Remnants of the germinal matrix, migratory streams, and transitional fields

10 External germinal layer (cerebellum)

9

66

66

6 Amygdaloid glioepithelium/ependyma

77

7 Anterolateral striatal neuroepithelium and subventricular zone

8 Anteromedial striatal neuroepithelium and subventricular zone

11 Subpial granular layer (cortical)

11

10

Corpus

callosum

(splenium)

Corpus

callosum

(splenium)

Flocculus?

(HX)

Flocculus?

(HX)

C

E

R

E

B

E

L

L

U

M

PLATE 59B