The Human Brain During the Third Trimester

Supraoptic

nucleus

Supraoptic

nucleus

Mesencephalic

nucleus (V)

Mesencephalic

nucleus (V)

Parabrachial

nucleus

Parabrachial

nucleus

Magnocellular prMagnocellular preoptic nucleuseoptic nucleus

Olfactory tubeOlfactory tuberrclecle

Orbital gyrusOrbital gyrus

Islands of Calleja

(in medial shell of

nucleus accumbens)

Islands of Calleja

(in medial shell of

nucleus accumbens)

Bed nucleus of

the stria terminalis

Bed nucleus of

the stria terminalis

Lateral

septal nucleus

Lateral

septal nucleus

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)

C

er

eb

ra

l (^) p
ed
un
cl
e
C
er
eb
ra
l (^) p
ed
un
cl
e
Choroid Third ventricle
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
formatio n
Reticular
formation
Reticular
fo rmation
Reticular
formation
Reticular
fo rmation
Reticular
formation
Reticular
fo rmation
Accessory nucleus (XI)
Ve ntral funiculus (spinal cord)
Gracile fasciculus
Dorsal motor nucleus (X)
Solitary nucleus?
Inter-
peduncular
nucleus
Inter-
peduncular
nucleus
Fourth
ventricl e
Gracile nucleus
TEGMENTUMTEGMENTUM
TECTUMTECTUM
Brachium of the inferior colliculus
Lateral lemniscus
Optic nerve layer
Superficial and middle
gray layers
Middle white layer
Deep gray layer
Deep white layer
Fast
nu igial
cleu
s?
Fast
nu igial
cleu
s?
INFERIOR
LOBE
INFERIOR
LOBE
POSTERIOR
LOBE
POSTERIOR
LOBE
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
EE
Medial accessory olive
Dorsal accessory olive
Principal olive
Superior
cerebellar
peduncle
Superior
cerebellar
peduncle
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

Pontine

gray

Arcuate nucleus

(medulla, infiltrated by the Raphe migration)

Optic

tract

Optic

tract

Optic

nerve (II)

Optic

nerve (II)

Olfactory peduncle

Red

nucleus

Red

nucleus

FFo rel's fieldsorel's fields

Anterior commissuAnterior commissurree

Stria medullaris

Lateral habenular nucleus Fasciola

cinereum

Central

nucleus

Central

nucleus

Cingulate gyrusCingulate gyrus

Pyr

am

ida

l

dec

ussa

tion

Pyr

am

ida

l

dec

ussa

tion

Corpus callosum

(genu)

Corpus callosum

(genu)

PREOPTIC

AREA

PREOPTIC

AREA

11

11

3

2 3

5

4

66

7

10

10

9

88

Medial

lemniscus

Medial

lemniscus

Pyramid

(corticospinal tract)

CEREBELLUM

(LATERAL VERMIS)

CingulumCingulum

Reticular

tegmental

nucleus

Reticular

tegmental

nucleus

Locus

coeruleus

Locus

coeruleus

Substantia

nigra

Substantia

nigra

Lateral tuberal nucleus

Medial

forebrain

bundle

Medial

forebrai n

bundle

Mammillo-

thalamic

tract

Mammillo-

thalamic

tract

Cave of the

septum

Cave of th e

septum

Fornix

(precommissural)

Fornix

(precommissural)

Fornix

(postcommissural)

Fornix

(postcommissural)

ANTERIOR

COMPLEX

ANTERIOR

COMPLEX

DORSAL

COMPLEX

DORSAL

COMPLEX

CENTRAL

COMPLEX

CENTRAL

COMPLEX

PERIVENTRICULAR

COMPLEX

PERIVENTRICULAR

COMPLEX

Anteroventral

nucleus

Anteroventra l

nucleus

Dorsomedial

nucleus

Dorsomedial

nucleus

Centromedian

nucleus

Centro median

nucleus

Dorsolateral

nucleus

Dorsolateral

nucleus

Anteromedial

nucleus

Anteromedial

nucleus

V

estib

complexular nuclear

V

estib

complexular nuclear

Pa

ra

ce

nt

ral

(^) nu
cle
us
Pa
ra
ce
nt
ral
(^) nu
cle
us
Inferior
olive
complex
Inferior
oliv e
complex
Inte
rpo
situ
sn
uc
le
su
Inte
rpo
situ
sn
uc
le
su
De
nta
te
nu
cle
us
De
nta
te
nu
cle
us
Habenulo-interpeduncular
tract
Posterior commissure
Paraflocculus (HIX)
Inferior cerebellar
peduncle?
Inferior cerebellar
peduncle?
Sup
er
ior
ce
re
be
ll
a
r
pe
du
nc
le
Sup
er
ior
ce
re
be
ll
a
r
pe
du
nc
le
6 Mesencephalic glioepithelium/ependyma
8 Cerebellar glioepithelium/ependyma
5 Thalamic glioepithelium/ependyma
4 Strionuclear glioepithelium
10 External germinal layer
1 Rostral migratory stream
7 Pontine and medullary glioepithelium/ependyma
2 Callosal glioepithelium
3 Fo rnical glioepithelium
9 Germinal trigone
11 Subpial granular layer
Remnants of the germinal matrix,
migratory streams, and transitional fields
11
1111
Cortical
plate
Cortical
plate
Whit e
matter
Whit e
matter
LayLayer er II
Transpontine corticofugal tract
(thick longitudinal bundles)
Middle
cerebellar
peduncle
Pontocerebellar fibers
(thin transverse bundles)
PLATE 202B