The Human Brain During the Third Trimester

Cerebral

aqueduct

Interhemispheric

fissure

White

matter

Layer I

Cortical

plate

Cingulate

gyrus

Cingulate

Induseum gyrus

griseum

Induseum

griseum

Lateral migratory

stream

Lateral migratory

stream

Lateral

fissure

FFornixornix

Third ventricle

(pineal recess)

Subcommissural

organ

Subcommissural

organ

Suprageniculate

nucleus

Suprageniculate

nucleus

ChorChoroid plexusoid plexus

Entorhinal

cortex

Entorhinal

cortex

Entorhinal

cortex

Entorhinal

cortex

Vental

posterolateral

nucleus

Vental

posterolateral

nucleus

Vental

posterolateral

nucleus

Ve ntal

posterolateral

nucleus

CorCorpus callosum (body)pus callosum (body)

R

e

ti

cu

la

r

n

u

c

le

u

s

R

e

ti

cu

la

r

n

u

c

le

u

s

Caudate

nucleus

(tail)

Caudate

nucleus

(tail)

Caudate

nucleus

(tail)

Caudate

nucleus

(tail)

C

er

eb

ra

l

p

ed

u

n

c

le

C

er

eb

ra

l

p

ed

u

n

c

le

C

er

eb

ra

l

p

ed

u

n

c

le

C

er

eb

ra

l

p

ed

u

n

c

le

Putame

n

Putame

n

Para-

subiculum

Para -

subiculum

CA1CA1

PPontine grayontine gray

Lateral

geniculate

body

Lateral

geniculate

Medial body

geniculate

body

Medial

geniculate

body

Su

bs

ta

nt

ia

n

ig

ra

Su

bs

ta

nt

ia

n

ig

ra

Ventral

tegmental

area

Ve ntral

tegmental

area

Inter-

peduncular

nucleus

Inter-

peduncular

nucleus

Inter-

peduncular

fo ssa

CA3CA3

HiluHiluss

Centro-

median

nucleus

Centro -

median

nucleus

PulvinarPulvinarPulvinarPulvinar

Red

nucleus

Red

nucleus

Cere bral

aqueduct

Oculomotor

nuclear

complex

Oculomotor

nuclear

complex

Central grayCentral gray

Stria

terminalis

Stria

terminalis

Stria

terminalis

Stria

terminalis

Medial

longitudinal

fasciculus

Medial

longitudinal

fasciculus

PrPretectuetectumm

Pre

su

bic

ul

um

Pre

su

bic

ul

um

Su

bi

cu

lu

m

Su

bi

cu

lu

m

A

m

m

o

n

's

h

o

rn

A

m

m

o

n

's

h

o

rn

M

ol

ec

u

la

rlayer

M

ol

ec

u

la

rlayer

G

r

a

nu

la

rl

ayer

G

r

a

nu

la

rl

ayer

Stratum

or

ie

ns

Stratum

or

ie

P ns

yramida

ll

ay

er

Pyr

amid

al

la

ye

r

Str

atumrad

iat

um

Str

atumrad

iat

um

St

ratumlacun

os

um

• m

ol

e

cu

al

er

St

ratumlacun

os

um

• m

ol

e

cu

al

er

Habenulo-

interpeduncular

tract

Habenulo-

interpeduncular

tract

Habenulo-

interpeduncular

tract

Habenulo-

interpeduncular

tract

Medial

lemniscus

Medial

lemniscus

Superior

cerebellar

peduncle

Superior

cerebellar

peduncle

Oculomotor

nerve fibers?

Oculomotor

nerve fibers?

Reticular tegmental nucleus

Transpontine corticofugal tract

(thick longitudinal bundles)

Middle cerebellar

peduncle

Pontocerebellar fibers (thin transverse bundles)

Pontocerebellar fibers (decussation)

Optic tract

E

xter

n

al cap

su

le

E

xter

n

al cap

su

le

THALAMUSTHALAMUS

PONSPONS

MIDBRAIMIDBRAINN

Subgranular

zone

Subgranular

zone

neD

at

et

yg

ru

s

neD

at

et

yg

ru

s

Ventral

posteromedial

nucleus

Ve ntral

posteromedial

nucleus

V

E

N

T

R

A

L

C

O

M

PL

E

X

V

E

N

T

R

A

L

(^) C
O
M
PL
E
X

R

E

T

IC

U

L

A

R

B

E

L

T

R

E

T

IC

U

L

A

R

B

E

L

T

POSTERIOR COMPLEXPOSTERIOR COMPLEX

CENTRAL COMPLEXCENTRAL COMPLEX

POSTERIOR COMPLEXPOSTERIOR COMPLEX

Temporal

lobe

Te mporal

lobe

Lateral vLateral ventricleentricle

Lateral vLateral ventricleentricle

Pa

ra

br

ac

hi

al

n

uc

le

us

Pa

ra

br

ac

hi

al

n

uc

le

us

Paracentral neuroepithelium

and subventricular zone

Pa racentral neuroepithelium

and subventricular zone

Temporal stratified

transitional field

Te mporal stratified

transitional field

Temporal neuro-

epithelium and

subventricular

zone

Te mporal neuro-

epithelium and

subventricular

zone

Pa rahippocampal neuroepithelium,

subventricular zone, and

stratified transitional field

AlvAlve ar glioepitheliuear glioepitheliumm

Posterior striatal

neuroepithelium and

subventricular zone

Po sterior striatal

neuroepithelium and

subventricular zone

Posterior striatal

neuroepithelium and

subventricular zone

Po sterior striatal

neuroepithelium and

subventricular zone

Fornical

glioepithelium

Fo rnical

glioepithelium

Paracentral stratified

transitional field

Pa racentral stratified

transitional field

Strionuclear

glioepithelium

Strionuclear

glioepithelium

Callosal glioepitheliuCallosal glioepitheliumm

FFo rnical glioepitheliuornical glioepitheliumm

H

IP

P

O

C

A

M

P

U

S

H

IP

P

O

C

A

M

P

U

S

Parahippocampal

gyrus

Parahippocampal

gyrus

Mesencephalic glioepithelium/ependymaMesencephalic glioepithelium/ependyma

TTe gmentumegmentum

I

n

s

u

la

r

g

y

r

u

s

I

n

s

u

la

r

g

y

r

u

s

Meyer's loop

(visual

radiation)

Meyer's loop

(visual

radiation)

Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics

Subpial granular layer

Internal

capsule

Internal

capsule

Callosal sling

PLATE 38B