The Human Brain During the Third Trimester

TTectuectumm

Fo

rn

ix

Fo

rn

ix

Fo

rn

ix

Fo

rn

ix

Lateral ve ntricle

Temporal

lobe

Temporal

lobe

Chor

oid plexus

Chor

oid plexus

ChorChoroid plexusoid plexus CoCorpus callosum (body)rpus callosum (body)

R

e

ti

c

u

la

r

n

u

c

le

u

s

R

e

ti

c

u

la

r

n

u

c

le

u

s

Caudate nucleus

(tail)

Caudate nucleus

(tail)

Hippocampus:

Lateral Lateral ventricleventricle

CA1CA1

PPontine grayontine gray

Lateral

geniculate body

Lateral

geniculate body

Medial

geniculate

body

Medial

geniculate

body

Supra-

geniculate

nucleus

Supra-

geniculate

nucleus

CA3CA3

Pyramidal layer

Granular layer

Stratum oriens

Stratum radiatum

Stratum

lacunosum-

moleculare

Molecular layer

Hilus

Fimbria/fornix

PulvinarPulvinar

Cerebral

aqueduct

Cere bral

aqueduct

Central grayCentral gray

Transpontine corticofugal tract

(thick longitudinal bundles)

Oculomotor

nucleus (III)

Oculomotor

nucleus (III)

Raphe nuclear complexRaphe nuclear complex

Superior colliculus

Brachium

of the

inferior

colliculus

Brachium

of the

inferior

colliculus

Medial

longitudinal

fasciculus

Medial

longitudinal

fasciculus

Superior

cerebellar

peduncle

Superior

cerebellar

peduncle

Cerebral

peduncle

Cere bral

peduncle

Middle cerebellar peduncle

Central

tegmental

tract

Central

tegmental

tract

Stria terminalis

Para-

subiculum

Para -

subiculum

Reticular teg-

mental nucleus

Reticular teg-

mental nucleus

Reticular

formation

Reticular

formation

Nerve V

In

te

rn

al

ca

ps

ul

e

In

te

rn

al

ca

ps

ul

e

Me

dia

ll

em

n

is

cu

s

Me

dia

ll

em

n

is

cu

s

S

u

p

er

fi

ci

al

gr

ay

lay

er

S

u

p

er

fi

ci

al

gr

ay

lay

er Opt

ic

ne

rv

e

la

ye

r

Op

tic

ne

rv

e

la

ye

r

M

id

dl

e

gr

ay

lay

er

M

id

dl

e

gr

ay

lay

er

M

id

dl

e

wh

ite

la

ye

r

M

id

dl

e

wh

ite

la

ye

r

D

ee

p

gr

ay

la

ye

r

D

ee

p

gr

ay

la

ye

r

Pos

ter

io

rC

o

m

m

is

su

re

Pos

ter

io

rC

o

m

m

is

su

re

Su

bi

cu

lu

m

Su

bi

cu

lu

m

Presu

bic

ul

um

Presu

bic

ul

um

A

m

m

on

's

ho

rn

A

m

m

on

's

ho

rn

Mesencephalic

nucleus of V

Mesencephalic

nucleus of V

Lateral

lemniscus

Lateral

lemniscus

THALAMUSTHALAMUS

PONSPONS

POSTERIOR COMPLEXPOSTERIOR COMPLEX

D

entategy

ru

s

D

entategy

ru

s

Subgranular

zone

Subgranular

zone

Subgranular

zone

Subgranular

zone

Subcommissural

organ

Subcommissural

organ

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

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

FFo rnical glioepitheliuornical glioepitheliumm

Me yer's loop

(visual radiation)

Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics

R

E

T

IC

U

L

A

R

(^) B
E
L
T
R
E
T
IC
U
L
A
R
(^) B
E
L
T
P
r
et
ec
tu
m
P
r
et
ec
tu
m
Pontocerebellar fibers
(thin transverse bundles)
Pontocerebellar fibers (decussation)
MIDBRAIMIDBRAINN
H
IP
P
O
C
A
M
P
U
S
H
IP
P
O
C
A
M
P
U
S
Parahippocampal
gyrus
Parahippocampal
gyrus
TTe gmentumegmentum
Strionuclear
glioepithelium
Strionuclear
glioepithelium
GlioepitheliuGlioepitheliumm
Stem cells of Stem cells of choroid plexuschoroid plexus
Subpial granular layer
Mesencephalic
glioepithelium/ependyma
Mesencephalic
glioepithelium/ependyma
White
matter
Layer I
Cortical
plate
Callosal glioepithelium
Callosal sling
PLATE 39B