The Human Brain During the Third Trimester

Nodulus

X

Nodulus

X

Uvula

IX

Uvula

IX

Pyramis

VIII

Pyramis

VIII

Folium

VIIa

Fo lium

VIIa

Declive

VI

Declive

VI

Culmen

IV, V

Culmen

IV, V

Lingula

I, II

Lingula

I, II

Centralis

III

Centralis

III

Tuber

VIIb

Tuber

VIIb

Stria

terminalis

Cerebral peduncle

Substantia nigra

Optic chiasm and tract

Diagonal band of Broca

(vertical limb)

Subcallosal area

Lateral preoptic area

Lateral hypothalamic area

Supraoptic nucleus

Lateral tuberal nucleus

Lateral septal nucleus

Lateral ve ntricle

FFornixornix F

or

ni

x

Fo

rn

ix

Habenular nuclei

Habenulo-

interpeduncular

tract

Choroid

plexus

Choroid

plexus

Corpus

callosum

(splenium)

Corpus

callosum

(splenium)

HYPO-

THALAMUS

HYPO-

THALAMUS MIDBRAIMIDBRAINN

PONSPONS

PPrreetteeccttuumm

Inferior

colliculus

Inferior

colliculus

Reticular

formation

Reticular

fo rmation

Reticular

formation

Reticular

fo rmation

Reticular

formation

Reticular

fo rmation

Reticular

formation

Reticular

formatio n

Reticular

formation

Reticular

formatio n

Reticular

tegmental

nucleus

Reticular

tegmental

nucleus

Pontocerebellar fibers

(thin transverse bundles)

Corticospinal tract

Medial

accessory olive

Arcuate nucleus

(medulla,with cells from

the raphe migration?)

Dorsal

accessory olive

Transpontine corticofugal tract

(thick longitudinal bundles)

Cuneate fasciculus

Inter-

peduncular

nucleus

Inter-

peduncular

nucleus

Fo urth

ventricl e

Cuneate

nucleus

Cuneate

nucleus

M

de

ia

l

le

m

in

cs

su

M

de

ia

l

le

m

in

cs

su

TEGMENTUMTEGMENTUM

TECTUMTECTUM

Brachium of the inferior colliculus

Corpus

callosum

(body)

Corpus

callosum

(body)

Induseum griseum

Cingulate gyrus

(retrosplenial area)

Lateral lemniscus

ANTERIOR LOBEANTERIOR LOBE

V E R M I SV E R M I S

Preculminate fissure

(separates centralis

and culmen)

A

Primary fissure

(separates anterior

and central lobes)

B

Secondary fissure

(separates central

and posterior lobes)

D

Prepyramidal fissure

(separates tuber and

pyramis)

C

Posterolateral fissure

(separates posterior

and inferior lobes)

E

Cerebellar fissures

CC

AA

AA

BB

BB

CC

EE DD

Su

pe

ri

or

(^) c
er
eb
ell
ar
pe
du
nc
le
Su
pe
ri
or
(^) c
er
eb
ell
ar
pe
du
nc
le
Vestibular
nuclear
complex
Vestibular
nuclear
complex
Solitary
nuclear
complex
Solitary
nuclear
complex
Biventral
lobule
(HVIII)
Biventra l
lobu le
(HVIII)
Paramedian
lobule
(HVIIb)
Paramedian
lobu le
(HVIIb)
Locus
coeruleus
Locus
coeruleus
Parabrachial
nucleus?
Parabrachial
nucleus?
Mesencephalic
nucleus (V)
Mesencephalic
nucleus (V)
Mesencephalic
nucleus (V)
Mesencephalic
nucleus (V)
Nucleus
ambiguus
Nucleus
ambiguus
Red
nucleus
Red
nucleus
Dorsomedial nucleuDorsomedial nucleuss
Dorsolateral nucleuDorsolateral nucleuss
Paraflocculus
(tonsil, HIX)
Paraflocculus
(tonsil, HIX)
Superior
olivary
complex
Superior
olivar y
complex
P
yr
am
id
P
yr
am
id
CE
N
T
R
A
L
L
O
B
E
CE
N
T
R
A
L
L
O
B
E
Superior
colliculus
Superior
colliculus
Central
gray
Central
gray
Trapezoid
body?
Tr apezoid
body?
MEDULLAMEDULLA
Inferior
olive
(principal
nucleus)
Inferior
oliv e
(principal
nucleus)

DO

RS

A

L

CO

M

PL

EX

DO

RS

A

L

CO

M

PL

EX

ANTERIOR

COMPLEX

ANTERIOR

COMPLEX

Centromedian

nucleus

Centro median

nucleus

Anteroventral

nucleus

Anteroventra l

nucleus

Anteromedial

nucleus

Anteromedial

nucleus

Anterodorsal

nucleus

Anterodorsal

nucleus

Bed nucleus of the

stria terminalis

(anterior division)

Bed nucleus of the

stria terminalis

(anterior division) Forel's

fields

Fo rel's

fields

B

ed

n

u

cl

eu

s^

of

th

e

st

ri

a^

te

rm

in

al

is

(p

os

te

ri

or

d

iv

is

io

n)

B

ed

n

u

cl

eu

s^

of

th

e

st

ri

a^

te

rm

in

al

is

(p

os

te

ri

or

d

iv

is

io

n

)

Olfactory

tubercle

Olfactory

tubercle

Nucleus

accumbens

Nucleus

accumbens

A

n

te

ri

or

co

m

m

is

su

re

A

n

te

ri

or

co

m

m

is

su

re

Str

ia

m

ed

u

ll

a

r

is

Str

ia

m

ed

u

ll

a

r

is

C

en

tr

al

la

te

ra

ln

uc

le

us

C

en

tr

al

la

te

ra

ln

uc

le

us

C

E

N

T

R

A

L

C

O

M

P

L

E

X

C

E

N

T

R

A

L

C

O

M

P

L

E

X

H

E

M

ISPHER

E

H

E

M

ISPHER

E

Fa

sti

gi

al

nu

cle

us

Fa

sti

gi

al

nu

cle

us

Su

pe

ri

or

(^) ce
re
be
lla
r (^) p
ed
un
cle
Su
pe
ri
or
(^) ce
re
be
lla
r (^) p
ed
un
cle Inte
rp
ositu
s
nu
cle
us
Inte
rp
ositu
s
nu
cle
us
Parabra
ch
ia
ln
uc
le
us
Parabra
ch
ia
ln
uc
le
us
Medialfo
re
br
ai
n
b
u
n
d
le
?
Medialfo
re
br
ai
n
b
u
n
d
le
?
THALAMUSTHALAMUS
1
Accumbent neuroepithelium and
subventricular zone (intermingled
with the source of the
rostral migratory stream)
Remnants of the germinal matrix,
migratory streams, and
transitional fields
9 External germinal layer (cerebellum)
10 Subpial granular layer (cortical)
5 Pontine glioepithelium/ependyma
6 Medullary glioepithelium/ependyma
7 Cerebellar glioepithelium/ependyma
8 Germinal trigone (cerebellum)
2 Fo rnical glioepithelium
4 Strionuclear glioepithelium
3 Septal glioepithelium/ependyma
PPontine grayontine gray
3
55
66
7
9
9
11
(^224422)
10
88
Damaged areas in section
C E R E B E L L U M
PLATE 103B