The Human Brain During the Third Trimester

Fornix

Oculomotor

nuclear

complex (III)

Oculomotor

nuclear

complex (III)

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

Oculomotor nerve (III)

Posterior commissure

Cerebral peduncle

Substantia nigra (pars reticulata)

Ve ntral tegmental area and

substantia nigra (pars compacta)

Arcuate

nucleus

Arcuate

nucleus

Mammillary

body

Mammillary

body

Third ventricle

Fornix

Cave of th e

septum

M

ed

ia

l

se

pt

al

(^) n
uc
le
us
(d
am
ag
ed
)

M

ed

ia

l

se

pt

al

(^) n
uc
le
us
(d
am
ag
ed
)
Pineal gland
Choroid
plexus
Choroid
plexus
Choroid
plexus
Choroid
plexus
Corpus
callosum
(splenium)
Corpus
callosum
(splenium)
HYPO-
THALAMUS
HYPO-
THALAMUS
SEPTUMSEPTUM
MIDBRAIMIDBRAINN
PONSPONS
Pr
etectum
Pr
etectum
Inferior
colliculus
Inferior
colliculus
Reticular
formation
Reticular
fo rmation
Reticular
formation
Reticular
fo rmation
Trochlear
nucleus (IV)?
Tr ochlear
nucleus (IV)?
Medial longitudinal fasciculus and tectospinal tract
Pontocerebellar fibers
(thin transverse bundles)
Middle cerebellar peduncle
Lateral corticospinal tract (medial edge)
Medial motor nucleus (spinal cord)
Ve ntral funiculus (spinal cord)
Gracile fasciculus
Inter-
peduncular
nucleus
Inter-
peduncular
nucleus

F

ou

rth

(^) v
en
tr
icle
Gracile nucleus
TEGMENTUMTEGMENTUM
TECTUMTECTUM
Nerve (IV) bundles?
Brachium of the inferior colliculus
Fastigial
nucleus
Fa stigial
nucleus
INFERIOR
LOBE
INFERIOR
LOBE

POSTERIOR

LOBE

POSTERIOR

LOBE

V E R M I SV E R M I S

Preculminate fissure

A (separates centralis and culmen)

Primary fissure

B (separates anterior and central lobes)

Secondary fissure

(separates central and posterior

lobes)

D

Prepyramidal fissure

C (separates tuber and pyramis)

Po sterolateral fissure

(separates posterior and inferior

lobes)

E

Cerebellar fissu res

CC

AA

AA

BB

BB

CC

DD

DD

EE

EE

Raphe

nuclear

complex

Raphe

nuclear

complex

Raphe

nuclear

complex

Raphe

nuclear

complex

Area postrema?

Superior

cerebellar

peduncle

Superior

cerebellar

peduncle

Hypoglossal nucleus (XII)

Prepositus

nucleus

Prepositus

nucleus

C

E

N

T

R

A

L

L

O

B

E

C

E

N

T

R

A

L

L

O

B

E

Superior

colliculus

Superior

colliculus

Central

gray

Central

gray

MEDULLAMEDULLA

SPISPINNAL CORDAL CORD

A

N

T

E

RI

OR LO

BE

A

N

T

E

RI

OR LO

BE

Pontine gray

Raphe nuclear complex

(infiltrated by the Raphe migration)

Arcuate nucleus (medulla,

penetrated by Raphe migration)

Medial accessory olive

Principal olivary nucleus

Inferior

olive complex

Inferior

olive complex

Optic

chiasm

Optic

chiasm

Supra-

chiasmatic

nucleus

Supra-

chiasmatic

nucleus

Olfactory bu lb and peduncle

Diagonal band of Broca

(vertical limb)

Induseum griseum

D

or

so

m

ed

ia

l^ a

n

d

ve

nt

ro

m

ed

ia

l^ n

uc

le

i

D

or

so

m

ed

ia

l^ a

n

d

ve

nt

ro

m

ed

ia

l^ n

uc

le

i

Red

nucleus

Red

nucleus

FFo rel's fieldsorel's fields

THALAMUS

massa intermedia

(damaged)

THALAMUS

massa intermedia

(damaged)

Transpontine corticofugal tract

(thick longitudinal bundles)

Medial lemniscuMedial lemniscuss

Anterior commissure

D

or

sa

l

te

gm

en

ta

l (^) n
u
cl
eu
s
D
or
sa
l
te
gm
en
ta
l (^) n
u
cl
eu
s
Central
nucleus
Central
nucleus
Gyrus Gyrus rrectuectuss
Subcallosal arSubcallosal areaea
Median preoptic nucleus
Hippocampal commissure?
Medial
preoptic
nucleus
Medial
preoptic
nucleus
Pyramidal
decussation
Pyramidal
decussation
M
ed
ia
ll
on
gi
tu
di
na
lf
as
ci
cu
lu
s
M
ed
ia
ll
on
gi
tu
di
na
lf
as
ci
cu
lu
s
Med
ial
lo
ng
it
ud
in
al
fa
sc
ic
ul
u
s
Med
ial
lo
ng
it
ud
in
al
fa
sc
ic
ul
u
s
Su
pe
rio
rc
er
eb
ella
rpeduncle
Su
pe
rio
rc
er
eb
ella
rpeduncle
Corpus callosum
(genu)
Corpus callosum
(genu)

C

or

p

us

c

al

lo

su

m

(b

od

y)

C

or

p

us

c

al

lo

su

m

(b

od

y)

PREOPTIC

AREA

PREOPTIC

AREA

Cere bral

aqueduct

11

11

3

3

(^22)
4
5
10
99
6
11
11
11
8
7
R
eti
cu
la
r
te
gm
en
ta
l
nu
cl
eu
s
R
eti
cu
la
r
te
gm
en
ta
l
nu
cl
eu
s
Medial
lemniscus
Medial
lemniscus
Pyramid (corticospinal tract)
CEREBELLUMCEREBELLUM
Remnants of the germinal matrix,
migratory streams, and transitional fields
1 Rostral migratory stream
12
12
Cortical
plate
White
matter
Layer I
3 Diencephalic/mesencephalic glioepithelium/ependyma
2 Diencephalic glioepithelium/ependyma
6 Precerebellar glioepithelium
4 Mesencephalic glioepithelium/ependyma
11 External germinal layer
7 Medullary glioepithelium/ependyma
5 Pontine glioepithelium/ependyma
10 Germinal trigone
9 Raphe migration
8 Cerebellar glioepithelium/ependyma
12 Subpial granular layer Damaged areas in section
Callosal
sling
PLATE 200B