The Human Brain During the Third Trimester

MIDBRAIMIDBRAINN

TECTU

M

TECTU

M

TEGMENTUMTEGMENTUM

Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics

CCaauuddaattee ((ttaaiill))

Lateral ventricle

Lateral ventricle

Fusiform

gyrus

Fusiform

gyrus

Occipital

gyrus

Occipital

gyrus

Po sterior striatal neuroepithelium

and subventricular zone

Cerebral

aqueduct

Cerebral

aqueduct

Nucleus of the

lateral lemniscus (dorsal)

Lateral lemniscus

Lateral fissure

Interhemispheric fissure

Orbital gyruOrbital gyruss

Choroid

plexus

Choroid

plexus

Rostral migratory streamRostral migratory stream

Ventro-

medial

nucleus

Ve ntro-

medial

nucleus

Lateral tuberal

nucleus

Medial

mammillary

nucleus

Medial

mammillary

nucleus

commissuAnterior

re

commissuAnterior

re

D

O

R

S

A

L

H

IP

P

O

C

A

M

P

U

S

D

O

R

S

A

L

H

IP

P

O

C

A

M

P

U

S

V

E

N

T

R

A

L

H

IP

PO

C

A

M

P

U

S

V

E

N

T

R

A

L

H

IP

PO

C

A

M

P

U

S

PParahippocampal gyrusarahippocampal gyrus

Subgranular zoneSubgranular zone

Supraoptic nucleuSupraoptic nucleuss

Arcuate

nucleus

Arcuate

nucleus

Suprachiasmatic nucleuSuprachiasmatic nucleuss

C

er

e

b

ra

lp

ed

u

n

cl

e

C

er

e

b

ra

lp

ed

u

n

cl

e

Central

gray

Central

gray

Endopirirorm

nucleus

Endopirirorm

nucleus

Red

nucleus

Red

nucleus

Trochlear

nucleus (IV)

Tr ochlear

nucleus (IV)

Dorsal teg-

mental nucleus

Dorsal teg-

mental nucleus

Central teg-

mental tract

Central teg-

mental tract

Mesencephalic

nucleus (V)

Mesencephalic

nucleus (V)

Medial

longitudinal

fasciculus

Medial

longitudinal

fasciculus

Lateral migratory streamLateral migratory streamLateral migratory streamLateral migratory stream

Primary

olfactory

cortex

(piriform)

Primary

olfactory

cortex

(piriform)

Pr

im

ar

y^ o

lfa

ct

or

y

co

rt

ex

(p

ir

ifo

rm

)

Pr

im

ar

y^ o

lfa

ct

or

y

co

rt

ex

(p

ir

ifo

rm

)

Stria

terminalis

Stria

terminalis

Substantia

nigra

Substantia

nigra

Inferior

colliculus

Inferior

colliculus

Reticular

formation

Reticular

fo rmation

Olfacto

ry sulcu

s

Olfactory

peduncle

Olfactory

peduncle

Lateral olfactory tract

Medial olfactory tract

AMYGDAMYGDALAALA

AMYGDAMYGDALAALA

Gyrus Gyrus rrectuectuss

Raphe nuclear complexRaphe nuclear complex

A

n

te

ri

ro

ol

fa

ct

or

y

un

lc

sue

A

n

te

ri

ro

ol

fa

ct

or

y

un

lc

sue

C

or

tic

om

ed

ia

l

co

m

p

le

x

C

or

tic

om

ed

ia

l

co

m

p

le

x

Central

nucleus

Central

nucleus

Am

yg

dal

o-h

ipp

o-

cam

pa

l (^) a
rea
Am
yg
dal
o-h
ipp
o-
cam
pa
l (^) a
rea
Inter-
peduncular
fossa
Inter-
peduncular
nucleus
Inter-
peduncular
nucleus
Optic
tract
Optic
tract
Habenulo-inter-
peduncular tract
Habenulo-inter-
peduncular tract
Oculomotor
nerve? (III)
Oculomotor
nerve? (III)
Medial lemniscus, spinocephalic,
and trigemino-thalamic tracts
Central
nucleus
Central
nucleus
Ventral
tegmental
area
Ve ntral
tegmental
area
Corticomedial
complex
Corticomedial
complex
Basolateral
complex
Basolateral
complex
Basolateral
complex
Basolateral
complex
Central
nucleus
Central
nucleus
Parabrachial
nucleus
Parabrachial
nucleus
AAmmmmoonn''sshhoorrnn
De
nta
te
gyr
us
De
nta
te
gyr
us
Su
periorcerebella
r
pe
du
elcn
Su
periorcerebella
r
pe
du
elcn
Pars
com
pact
a
Pars
com
pact
Par a
s^ re
ticula
ta
Pars
retic
ulat
a
Stria
terminalis
Stria
terminalis
CEREBELLUM
VVermisermis
Culmen (IVCulmen (IV-V-V))
Intercalated
masses
Intercalated
masses
Fi
m
br
ia
/f
or
ni
x
Fi
m
br
ia
/f
or
ni
x
Parahippocampal neuroepithelium
and subventricular zone
Pa rahippocampal neuroepithelium
and subventricular zone
Parahippocampal
stratified transitional field
Pa rahippocampal
FFo rnical glioepitheliuornical glioepitheliumm stratified transitional field
Alvear
glioepithelium
Alve ar
glioepithelium
Occipital stratified transitional fieldOccipital stratified transitional field
TTe mporal neuroepithelium and subvemporal neuroepithelium and subventricular zoneentricular zone
Occipital neuroepithelium
and subventricular zone
Occipital neuroepithelium
and subventricular zone
TTe mporal stratified transitional fielemporal stratified transitional fieldd
External
germinal layer
Subpial
granular
layer
Subpial
granular
layer
White matterWhite matter
HYPHYPOOTHALAMUSTHALAMUS
PREOPTIC
AREA
PREOPTIC
AREA
Glioepithelium
(optic tract)
Glioepithelium
(optic tract)
Third Third ventricle (preoptic rventricle (preoptic recess)ecess)
Third vThird ventricle (infundibuentricle (infundibularlar recess) recess)
Cortical plate
Layer I
Mesencephalic
glioepithelium/ependyma
Diencephalic (hypothalamic) glioepithelium/ependymaDiencephalic (hypothalamic) glioepithelium/ependyma
Amygdaloid
glioepithelium/ependyma
Amygdaloid
glioepithelium/ependyma
PLATE 141B