The Human Brain During the Third Trimester

Callosal sling

ANTERIOR

HYPOTHALAMUS

ANTERIOR

SUBSTANTIA HYPOTHALAMUS

INNOMINATA

SUBSTANTIA

INNOMINAT A

AMYGDAMYGDALAALA

Interhemispheric

fissure

White

matter

Layer I

Cortical

plate

Cingulate

gyrus

Cingulate

gyrus

Induseum

griseum

Induseum

griseum

Lateral

ventricle

C

au

d

at

e

n

u

cl

eu

s

(b

od

y)

C

au

d

at

e

n

u

cl

eu

s

(b

od

y)

C

au

d

at

e

n

u

cl

eu

s

(b

od

y)

C

au

d

at

e

n

u

cl

eu

s

(b

od

y)

External

capsule

External

capsule

Temporal

lobe

Te mporal

lobe

PPPPuuuuttttaaaammmmeeeennnn

C

la

u

st

r

u

m

C

la

u

st

r

u

m

FFornixornix

FFFornixororninixx

Stria

medullaris

Cave of the septum

Subfornical orga n

Mammillo-

thalamic

tract

Anterior

commissure

Anterior

commissure

Third

ventricle

Lateral

hypothalamic

area

Lateral

hypothalamic

area

Stria terminalisStria terminalis

Bed nucleus of

the stria terminalis

Bed nucleus of

the stria terminalis

Fo ramen of Monro

ChorChoroid plexusoid plexus

Diagonal band of Br

oca

(horizontal limb)

Diagonal band of Br

oca

(horizontal limb)

Anteroventral

nucleus

Anteroventra l

nucleus

Anterodorsal

nucleus

Anterodorsal

nucleus

Antero-

medial

nucleus

Antero-

medial

nucleus

Infundibu lar

recess

Paraven-

tricular

nucleus

Paraven-

tricular

nucleus

Supraoptic

nucleus

Supraoptic

nucleus

Ventromedial

nucleus

Ve ntro medial

nucleus

Arcuate

nucleus

Arcuate

nucleus

Optic tract

CoCorpus callosum (body)rpus callosum (body)

Anterior

amygdaloid

area

Anterior

amygdaloid

area

Cortical

nuclei

Cortical

nuclei

Medial

nucleus

Medial

nucleus

Lateral

nucleus

Lateral

nucleus

Central

nucleus

Central

nucleus

Intercalated

cell groups

Intercalated

cell groups

BBaassaall nnuucclleeuuss

Vental

anterior

nucleus

Ve ntal

anterior

nucleus

Globus

pallidus

(external

segment)

Globus

pallidus

(external

segment)

Globus pallidus

(internal segment)

Globus pallidus

(internal segment)

CingulumCingulum

Me

du

ll

a

r

y

la

m

in

a

Me

du

ll

a

r

y

la

m

in

a

Medial forebrain

bundle

Medial forebrai n

bundle

Paratenial

nucleus

Paratenial

nucleus

Nucleus of the

lateral olfactory tract?

Amygdalo-

hippocampal

area?

Lateral olfactory tract

Ansa lenticularisAnsa lenticularis

Reticular

nucleus

Reticular

nucleus

ANTERIOR

COMPLEX

ANTERIOR

COMPLEX

R

ET

IC

U

LA

R

(^) B
EL
T
R
ET
IC
U
LA
R
(^) B
EL
T
V
E
N
TR
A
L
C
O
M
P
LE
X
V
E
N
TR
A
L
C
O
M
P
LE
X
THALAMUSTHALAMUS
BBA SAL GANGLIASAL GANGLIAA
FrFrontal lobeontal lobe
Insular
gyrus
Insular
gyrus
Callosal glioepitheliuCallosal glioepitheliumm
Streams of cells
migrating into the
basolateral nuclear
complex of the amygdala
Streams of cells
migrating into the
basolateral nuclear
complex of the amygdala
dorsadorsall
vventra lentral
PERIVENTRICULAR
C
O
M
PLEX
PERIVENTRICULAR
C
O
M
PLEX
Hypothalamic
glioepithelium/ependyma
Hypothalamic
glioepithelium/ependyma
Glioepithelium
(optic tract)
Thalamic
glioepithelium/
ependyma
Thalamic
glioepithelium/
ependyma
Subpial granular layer
Callosal sling
FFo rnical glioepitheliuornical glioepitheliumm
Lateral migratory
stream (infiltrates
the claustrum)
Lateral migratory
stream (infiltrates
the claustrum)
Lateral migratory
stream (extends to
temporal cortex)
Lateral migratory
stream (extends to
temporal cortex )
Lateral migratory stream
(extends to amygdala)
Lateral migratory stream
(extends to amygdala)
Frontal neuroepithelium
and subventricular zone
Fr ontal neuroepithelium
and subventricular zone
Frontal stratified
transitional field
Fr ontal stratified
transitional field
Anteromedial striatal
neuroepithelium and
subventricular zone
Anteromedial striatal
neuroepithelium and
subventricular zone
Anterolateral striatal
neuroepithelium and
subventricular zone
Anterolateral striatal
neuroepithelium and
subventricular zone
Strionuclear
glioepithelium
Uncinate
fasciculus
Uncinate
fasciculus
Lateral
fissure
Inter
nal capsule (anterior limb)
Inter
nal capsule (anterior limb)
Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics
Stem cells of
choroid plexus
Stem cells of
choroid plexus
PLATE 34B