The Human Brain During the Third Trimester

Anterior lobe

(HI-HV)

Anterior lobe

(HI-HV)

Simplex

lobule

(HVI)

Simplex

lobu le

(HVI)

Primary fissure

Ansiform lobule

crus II

(HVIIA)

Ansifo rm lobu le

crus II

(HVIIA)

Ansiform lobule

crus I

(HVIIA)

Ansiform lobu le

crus I

(HVIIA)

Olfactory tubeOlfactory tuberrclecle

Orbital gyrusOrbital gyrus

Lateral hypothalamic area

Supraoptic nucleus

Lateral ventricle

Choroid

plexus

Choroid

plexus

Corpus

callosum

(splenium)

Corpus

callosum

(splenium)

HYPHYPOOTHALAMUSTHALAMUS

BASAL

GANGLIA

BA SAL

GANGLIA

VENTRAL

HIPPOCAMPUS

VENTRAL

HIPPOCAMPUS

MIDBRAIMIDBRAINN

PONSPONS

Pr

etectu

m

Pr

etectu

m

Inferior

colliculus

Inferior

colliculus

R

etic

u

la

r

form

atio

n

R

etic

u

la

r

fo

rm

atio

n

Reticular

formation

Reticular

fo rmation

Nerve XII? (roots)

Lateral funiculus (spinal cord)

Cuneate fasciculus?

External cuneate nucleus?

Cuneate nucleus

PulvinarPulvinar

POSTERIOR

COMPLEX

POSTERIOR

COMPLEX

Floccular peduncleFloccular peduncle

FFourth ourth ventricle (lateral rventricle (lateral recess)ecess)

Spinal nucleus and tract (V)

TEGMENTUMTEGMENTUM

TECTUMTECTUM

Brachium of the inferior colliculus

Lateral reticular nucleus

Principal olive

Superior

colliculus

Superior

colliculus

MEDULLAMEDULLA

SPISPINNAL CORDAL CORD

Pontine

gray

Pontine

gray

Superior olive complex

(periolivary nuclei)

Optic

tract

Optic

tract

Fore

l's fi

elds?

Fore

l's fi

elds?

Nucleus

accumbens

Nucleus

accumbens

Entorhinal

cortex

Entorhinal

cortex

SubiculuSubiculumm

In

ter

nal cap

su

le

In

ter

nal cap

su

le

Anterior

commissure

Anterior

commissure

Stria medullaris

Stria terminalis

Mammillo-

thalamic

tract

Mammillo-

thalamic

tract

Medial forebrain

bundle

Medial forebrai n

bundle

Choroid plexus

Stem cells of

the choroid plexus?

Fasciola

cinereum

C

in

g

u

la

te

g

y

r

u

s

C

in

g

u

la

te

g

y

r

u

s

Corpus callosum

(genu)

Corpus callosum

(genu)

11

11

33

22

44

55

66

710

88

99

77

107

11

11

Motor nucleus (VII)

CEREBELLUM

(HEMISPHERE)

C

in

g

u

lu

m

C

in

g

u

lu

m

Substantia

nigra

Substantia

nigra

ANTERIOR

COMPLEX

ANTERIOR

COMPLEX

DORSAL

COMPLEX

DORSAL

COMPLEX

CENTRAL

COMPLEX

CENTRAL

COMPLEX

Antero-

ventral

nucleus

Antero-

ventra l

nucleus

R

et

icu

la

r

nu

cl

eu

s

R

et

icu

la

r

nu

cl

eu

s

Dorsomedial

nucleus

Dorsomedial

nucleus

Centromedian

nucleus

Centromedian

nucleus

D

or

so

la

te

ra

l

n

uc

le

us

D

or

so

la

te

ra

l

n

uc

le

us

Ante

m ro-

edial

nucle

us

Ante

m ro-

edial

nucle

us

Sub-

thalamic

nucleus

Sub-

thalamic

nucleus

VENTRAL

COMPLEX

VENTRAL

COMPLEX

V

es

ti

b

ul

a

r

nu

cl

ea

r

co

m

p

le

x

V

es

ti

b

ul

a

r

nu

cl

ea

r

co

m

p

le

x

Inferior

olive

complex

Inferior

oliv e

complex

Inferior cerebellar

peduncle

Inferior cerebellar

peduncle

Parabigeminal nuclei (dorsal and ve ntral)

Dorsal nucleus of the lateral lemniscus

Lateral lemniscus

Ve ntral nucleus of the lateral lemniscus

Principal sensory nucleus (V) and nerve V bundles

S

pi

n

al

n

u

cl

eu

s

an

d

tr

ac

t (^) (
V
)
S
pi
n
al
n
u
cl
eu
s
an
d
tr
ac
t (^) (
V
)
C
e
re
b
ra
l pedu
nc
le
C
e
re
b
ra
l pedu
nc
le
Middle cerebellar peduncle
Transpontine corticofugal tract
(thick longitudinal bundles)
Bed nucleus of the
stria terminalis
P
a
ra
ce
nt
ra
ln
uc
leu
s
P
a
ra
ce
nt
ra
ln
uc
leu
s
Ventral
posterolateral
nucleus
Ve ntral
posterolateral
nucleus
Ventral
postero-
medial
nucleus
Ve ntral
postero-
medial
nucleus
Ventral
lateral
nucleus
Ve ntral
lateral
nucleus
THALAMUSTHALAMUS

SUBTHALAMUSSUBTHALAMUS

Dentate nucleusDentate nucleus

M

ed

ia

l

le

m

n

is

c

u

s

M

ed

ia

l

le

m

n

is

c

u

s

Para-

flocculus

(HIX)

Para -

flocculus

(HIX)

Biventral lobule

(HVIII)

Paramedian

lobule

(HVIIB)

Paramedian

lobu le

(HVIIB)

Corona

radiata

Corona

radiata

White matterWhite matter

CCoorrttiiccaall ppllaattee

5

Accumbent neuroepithelium and subventricular zone

(intermingled with the rostral migratory stream)

6 Strionuclear neuroepithelium and subventricular zone

7 Pontine glioepithelium/ependyma

8 Cerebellar glioepithelium/ependyma

9 Germinal trigone

2 Fr ontal neuroepithelium and subventricular zone

10 External germinal layer

1 Rostral migratory stream

4 Callosal glioepithelium

11 Subpial granular layer

3 Fr ontal stratified transitional field

Remnants of the germinal matrix,

migratory streams, and transitional fields

1111

LaLayer yer II

Pontocerebellar fibers

(thin transverse bundles)

Frontal

lobe

Frontal

lobe

Occipital

lobe

Occipital

lobe

Cingulate

gyrus

(retrosplenial

area)

Cingulate

gyrus

(retrosplenial

area) Parieto-occipital sulcus

Damaged areas in section

PLATE 203B