The Human Brain During the Third Trimester

Fornical

glioepithelium

Subgranular

zone

Cerebral

aqueduct

Cerebral

aqueduct

MIDBRAIMIDBRAINN

TECTU

M

TECTU

M

TEGMENTUMTEGMENTUM

Oculomotor nuclear complex (III)Oculomotor nuclear complex (III)

FFoorrnniixx

Fo

rni

x

Fo

rni

x

Exte

rnal

(^) cap
sule
Exte
rnal
cap
sule Caudate
(tail)
Caudate
(tail)
Subcommissural orga n
Lateral fissure
Interhemispheric fissure
Cortical plate
(orbital gyrus)
White matter
(orbital gyrus)
St
ria
(^) te
rm
in
alis
St
ria
(^) te
rm
in
alis
Third Third ventricleventricle
T
H
A
L
A
M
U
S
(P
O
ST
E
R
IO
R
(^) C
O
M
P
L
E
X
)
T
H
A
L
A
M
U
S
(P
O
ST
E
R
IO
R
(^) C
O
M
P
L
E
X
)
Lateral migratory stream
(infiltrates the endopiriform nucleus)
Lateral migratory stream
(in the ve ntrolateral frontal lobe)
Rostral migratory stream
VVe ntromedial nucleuentromedial nucleuss
Tubero-
mammillary
nucleus
Tubero-
mammillary
nucleus
Medialpr
eopticar
ea
Medialpr
eopticar
ea Su
pra
ma
mm
illa
ry
area
Sup
ram
amm
illa
ry
area
An
ter
io
r
co
m
mi
ssu
re
An
ter
io
r
co
m
mi
ssu
re
HHIIPPPPOOCCAAMMPPUUSS
Dentate gyrusDentate gyrus
Ammon's horAmmon's hornn
Subiculu
m
Subiculu
m
HYPHYPOOTHALAMUSTHALAMUS
Lamina terminalis
Medial
forebrain bundle
Medial
forebrain bundle
Medial
geniculate
body
Medial
geniculate
body
Lateral
geniculate
body
Lateral
geniculate
body
C
e
re
b
ra
l
p
e
d
u
n
cl
e
C
e
re
b
ra
l
p
e
d
u
n
cl
e
Su
bth
alam
ic
nu
cleu
s
Su
bth
alam
ic
nu
cleu
s
Basal nucleus
of Meynert
Basal nucleus
of Meynert
Ve
nt
ra
l (^) s
tr
ia
tu
m
Ve
nt
ra
l (^) s
tr
ia
tu
m
Central
gray
Central
gray
Endopirirorm
nucleus
Endopirirorm
nucleus
Red
nucleus
Red
nucleus
Mesencephalic
nucleus (V)
Mesencephalic
nucleus (V)
Medial longitudinal
fasciculus
Medial longitudinal
fasciculus

S

U

B

ST

A

N

TI

A

IN

N

O

M

IN

AT

A

S

U

B

ST

A

N

TI

A

IN

N

O

M

IN

AT

A

Lateral migratory stream

Primary olfactory

cortex (piriform)

Primary olfactory

cortex (piriform)

Primary olfactory

cortex (piriform)

M

ed

ial

le

m

nis

cu

s

M

ed

ial

le

m

nis

cu

s

M

ed

ia

l (^) l
em
ni
sc
us
M
ed
ia
l (^) l
em
ni
sc
us
Ventral
striatum
Ve ntral
striatum
Islands of Calleja
A
nt
er
io
r
co
m
m
iss
ur
e(
te
m
po
ra
lli
m
b)
A
nt
er
io
r
co
m
m
iss
ur
e(
te
m
po
ra
lli
m
b)
Stria
terminalis
Stria
terminalis
Central nucleus
(amygdala)
Central nucleus
(amygdala)
Medial nucleus?
(amygdala)
Medial nucleus?
(amygdala)
Medial
nucleus?
(amygdala)
Medial
nucleus?
(amygdala)
Central
nucleus?
(amygdala)
Central
nucleus?
(amygdala)
In
te
rn
al
(^) ca
ps
ul
e (^) (
po
ste
ri
or
(^) li
m
b)
In
te
rn
al
(^) ca
ps
ul
e (^) (
po
ste
ri
or
(^) li
m
b)
Substantia
nigra
Substantia
nigra
Br
ac
hi
um
of
th
einf
er
ior
co
lli
cu
lu
s
Br
ac
hi
um
of
th
einf
er
ior
co
lli
cu
lu
s
Inferior
colliculus
Inferior
colliculus
O
p
t
i
c
t
r
a
c
t
O
p
t
i
c
t
r
a
c
t
O
p
t
i
c
t
r
a
c
t
O
p
t
i
c
t
r
a
c
t
L
a
te
r
a
l
o
l
f
a
c
t
o
r
y
t
r
a
c
t
L
a
te
r
a
l
o
l
f
a
c
t
o
r
y
t
r
a
c
t
V
entral tegmental
decussation
Ve
decussationntral tegmental
Reticular
formation
Reticular
Ret fo rmation
ic
ul
ar
fo
rm
at
io
n
R
eti
cu
la
r
fo
rm
at
io
n
Caudate
(tail)
Caudate
(tail)
Lateral olfactory tractLateral olfactory tract
Olfactory tubercle
Olfactory
tubercle
Olfactory
tubercle
AMYGDAMYGDALAALA
Subcallosal area
Fo
rni
x
Fo
rni
x
C
e
re
b
r
a
l
p
ed
un
cle
C
e
re
b
r
a
l
p
ed
un
cle
In
te
rp
ed
unc
lu
ra
un
lc
ue
s
Ha
be
nu
lo-
int
er
ped
un

• 
  

cu

lar

(^) tr
act
Ha
be
nu
lo-
int
er
ped
un

• 
  

cu

lar

(^) tr
act
In
te
rp
ed
unc
lu
ra
un
lc
ue
s
Raphe nuclear complexRaphe nuclear complex
Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics
Te mporal neuroepithelium
and subventricular zone
Pa rahippocampal neuro-
epithelium and
subventricular zone
Te mporal stratified transitional field
Pa rahippocampal stratified
transitional field
Stem cells of
choroid plexus
Stem cells of
choroid plexus
Fo rnical
glioepithelium
PPo sterior striatal neuroepithelium and subvosterior striatal neuroepithelium and subventricular zoneentricular zone
Alve ar glioepithelium
Subgranular
zone
Strionuclear
glioepithelium
Strionuclear
glioepithelium
Parahippocampal
gyrus
Parahippocampal
gyrus
White matter
Layer I
Cortical plate
PPerieriventricular nucleuventricular nucleuss
PrPreoptic eoptic rrecessecess
PREOPTI
C
AREA
PREOPTI
C
AREA
Medial prMedial preoptic nucleuseoptic nucleus
Sexually dimoSexually dimorphic nucleusrphic nucleus??
Late
ral h
ypo
thala
mic
area
Late
ral h
ypo
thala
mic
area
Mesencephalic glioepithelium/ependyma
Diencephalic (hypothalamic)
glioepithelium/ependyma
Diencephalic (hypothalamic)
glioepithelium/ependyma
PLATE 139B