The Human Brain During the Third Trimester

White matter

Cortical plate

Layer I

TTe mporal lobeemporal lobe

Putamen

Subgranular zone

Te mporal neuroepithelium,

subventricular zone, and

stratified transitional field

Pontocerebellar fibers

(thin transverse bundles)

Nerve V Nerve V

Pontine gray

Putamen

External capsule

Middle cerebellar peduncle

Middle cerebellar peduncle

Pontocerebellar fibers (decussation)

Transpontine corticofugal tract

(thick longitudinal bundles)

Lateral ve ntricle

Stratum oriens

Stratum pyramidale

Stratum radiatum

Stratum lacunosum moleculare

Dentate granular layer

Dentate molecular layer

Dentate hilus

THALAMUSTHALAMUS

SubiculuSubiculumm

DORSAL

COMPLEX

(dorsomedial nucleus)

DORSAL

COMPLEX

(dorsomedial nucleus)

Medial

geniculate

body

Medial

geniculate

body

Medial longitudinal

fasciculus

Medial longitudinal

fasciculus

R

a

p

h

e

n

u

cl

e

a

r^

c

o

m

p

le

x

R

a

p

h

e

n

u

cl

e

a

r^

c

o

m

p

le

x

Internal capsule (posterior limb)

Stria terminalis

Caudate (tail)

PONSPONS

MIDBRAIN

TEGMENTUM

MIDBRAIN

TEGMENTUM

H

I

P

P

O

C

A

M

P

U

S

H

I

P

P

O

C

A

M

P

U

S

Dentate gyrus

Lateral

geniculate

body

Lateral

geniculate

body

Fimbria

R

E

T

I

C

U

L

A

R

B

E

L

T

R

E

T

I

C

U

L

A

R

B

E

L

T

Para-

hippocampal

gyrus

Para -

hippocampal

gyrus

PulvinarPulvinar

PulvinarPulvinar

Ammon's horn

PrPretectuetectumm

Brachium of the

inferior colliculus

Brachium of the

inferior colliculus

CeCerre bral aqueducebral aqueductt

Superior

cerebellar

peduncle

Superior

cerebellar

peduncle

Central

gray

Central

gray

CA3CA3

CA1CA1

Reticular

formation

Reticular

fo rmation

Suprageniculate

nucleus

Suprageniculate

nucleus

Re

ticu

lartegmentalnu

cle

R us

etic

ulartegmentalnuc

le

us

M

ed

ia

ll

em

nis

cus

M

ed

ia

ll

em

nis

cus

Parabrachial

nucleus

Parabrachial

nucleus

L

a

t

e

r

a

l

le

m

n

is

c

u

s

L

a

t

e

r

a

l

le

m

n

is

c

u

s

Nucleus of

the posterior

commissure

Nucleus of

the posterior

commissure

Pos

te

rio

rcom

mis

sur

Pos e

te

rio

rcom

mis

sur

e

Trochlear nucleus

(IV)

Tr ochlear nucleus

(IV)

CEN

T

R

A

L

C

O

M

P

L

E

X

p(

ar

ac

en

tr

al

un

lc

ue

)s

CEN

T

R

A

L

C

O

M

P

L

E

X

p(

ar

ac

en

tr

al

un

lc

ue

)s

VENTRAL COMPLEX?

(ventral posterolateral

nucleus)

VENTRAL COMPLEX?

(ventral posterolateral

nucleus)

P

O

S

T

E

R

I

O

R

C

O

M

P

L

E

X

P

O

S

T

E

R

I

O

R

C

O

M

P

L

E

X

R e t i c u l a r n u c l e u s

R e t i c u l a r n u c l e u s

Subcom-

missural

organ

Subcom-

missural

organ

Pa rahippocampal stratified transitional field

Pa rahippocampal neuroepithelium

and subventricular zone

Alve ar glioepithelium

Strionuclear

glioepithelium

Subpial

granular

layer

Germinal and transitional

structures in italics

Germinal and transitional

structures in italics

Pr

esubiculu

m

Pr

esubiculu

m

FusifFusiform gyrusorm gyrus

Mesencephalic

glioepithelium/

ependyma

Mesencephalic

glioepithelium/

ependyma

Me yer's loop (visual radiation)

Oculomotor complex (III)Oculomotor complex (III)

PLATE 184B