The Human Brain During the Third Trimester

TEGMENTUMTEGMENTUM

White matter

Cortical plate

Layer I

TTe mporal lobeemporal lobe

Caudate (tail)

Fusiform

gyrus

Fusiform

gyrus Subgranular zone

Nerve VIII and ve ntral cochlear nucleus

Nucleus of the

lateral lemniscus

(ventral)

Nucleus of the

lateral lemniscus

(dorsal)

Nucleus of the

lateral lemniscus

(ventral)

Parabigeminal

nucleus (ventral)

Zonal layer

Optic nerve layer

Superficial gray layer

Middle gray layer

Middle whitelayer

Deep gray layer

Deep white layer

Lateral lemniscus

Lateral lemniscus

Putamen

Internal capsule (posterior limb)

Inferior cerebellar peduncle

and spinocerebellar tracts

Arcuate nucleus (medulla)

Nerve V (myelination gliosis)

Spinocephalic tract?

Pyramid

(corticospinal

tract

)

Pyramid

(corticospinal

tract

)

Lateral ventricle

Stratum oriens

Stratum pyramidale

Stratum radiatum

Stratum lacunosum moleculare

Dentate granular layer

Dentate molecular layer

Dentate hilus

THALAMUSTHALAMUS

SubiculuSubiculumm

Medial

longitudinal

fasciculus and

tectospinal

tract

Medial

longitudinal

fasciculus and

tectospinal

tract

R

a

p

h

e

n

u

cl

ea

r

c

o

m

p

le

x

R

a

p

h

e

n

u

cl

ea

r

c

o

m

p

le

x

Stria terminalis

Stria terminalis

PONSPONS

TECTUMTECTUM

MIDBRAIMIDBRAINN

C

E

R

E

B

E

L

L

U

M

(H

E

M

IS

P

H

E

R

E

)

C

E

R

E

B

E

L

L

U

M

(H

E

M

IS

P

H

E

R

E

)

H

IP

P

O

C

A

M

P

U

S

H

IP

P

O

C

A

M

P

U

S

Dentate gyrus

FimbriaFimbria

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

Ammon's horn

Superior

colliculus

Superior

colliculus

C

er

eb

ra

l^ a

q

u

ed

uc

t

Central

gray

Central

gray

CA3CA3

CA1CA1

Reticular

formation

Reticular

fo rmation

Reticular

formation

Reticular

fo rmation

R

et

ic

u

la

r

fo

rm

a

ti

o

n

R

et

ic

u

la

r

fo

rm

a

ti

o

n

Abducens

nucleus (VI)?

Abducens

nucleus (VI)?

Dorsal tegmen-

tal nucleus?

Dorsal tegmen-

tal nucleus?

R

te

ci

u

al

r

n

u

c

le

u

s

R

te

ci

u

al

r

n

u

c

le

u

s

Subcom-

missural

organ

Subcom-

missural

organ

M

e

d

ia

l

l

e

m

n

i

s

c

u

s

M

e

d

ia

l

l

e

m

n

i

s

c

u

s

Trapezoid

body

Tr apezoid

body

Superior

olive

complex

Superior

oliv e

complex

Inferior

olive

complex

Inferior

oliv e

complex

M

di

d

le

ce

r

e

b

e

ll

a

r

p

ed

un

cle

M

di

d

le

ce

r

e

b

e

ll

a

r

p

ed

un

cle

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

)

Su

pe

ri

or

ce

re

be

all

r

ep

ud

cn

le

Su

pe

ri

or

ce

re

be

all

r

ep

ud

cn

le

Pa

ra

br

ac

hi

al

nu

cl

eu

s

Pa

ra

br

ac

hi

al

nu

cl

eu

s

POSTERIOR

COMPLEX

POSTERIOR

COMPLEX

Simplex

lobule

(HVI)

Simplex

lobu le

(HVI)

MEDULLAMEDULLA

Te mporal neuroepithelium,

subventricular zone, and

stratified transitional field

Pa rahippocampal stratified transitional field

Pa rahippocampal neuroepithelium

and subventricular zone

Alve ar glioepithelium

Subpial

granular

layer

External germinal layer

Raphe migration

External

germinal layer

Strionuclear glioepithelium

Po sterior striatal

neuroepithelium and

subventricular zone

Fi mbrial glioepithelium

Germinal and transitional

structures in italics

Germinal and transitional

structures in italics

Mesencephalic

glioepithelium/

ependyma

Mesencephalic

glioepithelium/

ependyma

Me yer's loop (visual radiation)

PPrreessuubbiiccuulluumm

Do

rs

al

co

ch

le

ra

n

uc

le

u

s?

Do

rs

al

co

ch

le

ra

n

uc

le

u

s?

PLATE 185B