The Human Brain During the Third Trimester

Motor nuc-

leus (V)?

Motor nuc-

leus (V)?

Principal sensory

nucleus (V)?

Principal sensory

nucleus (V)?

Motor

nucleus

(VII)

Motor

nucleus

(VII)

Dorsal nucleus

of lat. lemniscus

Dorsal nucleus

of lat. lemniscus

Ventral nucleus

of lat. lemniscus

Ventral nucleus

of lat. lemniscus

PPontine grayontine gray

5

Accumbent neuroepithelium and subventricular zone

(infiltrated by the rostral migratory stream)

1 Rostral migratory stream

2 Rostral migratory stream (source area)

4 Fo rnical glioepithelium

3 Callosal glioepithelium

8 Strionuclear glioepithelium

11 External germinal layer (cerebellum)

10 Germinal trigone (cerebellum)

6 Anteromedial striatal neuroepithelium and subventricular zone

7 Anterolateral striatal neuroepithelium and subventricular zone

9 Pontine and medullary glioepithelium/ependyma

11

22

33

33

33

44

55

66

66

66

77

77

8

88

8

99

1010

11

Remnants of the germinal matrix, migratory streams, and transitional fields

THALAMUSTHALAMUS

Lateral

hypothalamus

Lateral

hypothalamus

Lateral

preoptic area

Lateral

preoptic area

Magnocellular preoptic nucleus

Supraoptic nucleus

Optic tract

Diagonal band of Broca (vertical limb)

Olfactory tubercle

Olfactory

bu lb

Olfactory peduncle

Nucleus

accumbens

Nucleus

accumbens

Internal

capsule

Internal

capsule

Caudate nucleus

(head)

Caudate nucleus

(head)

Lateral ventricle

FFornixornix

Dorsolateral nucleuDorsolateral nucleuss

Dorsomedial nucleuDorsomedial nucleuss

Be

d^

nu

cle

us

of

th

e

st

ria

te

rm

in

ali

s

Be

d^

nu

cle

us

of

th

e

st

ria

te

rm

in

ali

s

Anteroventral

nucleus

Anteroventral

nucleus

Mammillo-

thalamic

tract

Mammillo-

thalamic

tract

Ventral

anterior

nucleus

Ventral

anterior

nucleus

Ventral

postero-

lateral

nucleus

Ventral

postero-

lateral

nucleus

Ventral

posteromedial

nucleus

Ve ntral

posteromedial

nucleus

Centromedian

nucleus

Centromedian

nucleus

C

en

tr

al

la

te

r

a

l

nu

cle

us

C

en

tr

al

la

te

r

a

l

nu

cle

us

PulvinarPulvinar

Pr

et

ec

tu

m

Pr

et

ec

tu

m

Subthalamic

nucleus

Subthalamic

nucleus

Fie

lds

of (^) F
ore
l
Fie
lds
of (^) F
ore
l
Superior
colliculus
Superior
colliculus
Inferior
colliculus
Inferior
colliculus
Brachium of
inferior colliculus
Brachium of
inferior colliculus
Optic ne rve
layer
Optic nerve
laye r
Substantia
nigra
Substantia
nigra
Ret
icul
ar (^) f
orm
atio
n
Ret
icul
ar (^) f
orm
atio
n
Reticular
formatio
n
Reticular f
ormatio
n
Inferior
olive
Inferior
olive
Pontocerebellar fibers
Middle cerebellar peduncle
(roots)
Superior
cerebellar
peduncle
Superior
cerebellar
peduncle
Parabrachial
nucleus?
Parabrachial
nucleus?
Cuneate nucleuCuneate nucleuss
Cuneate fasciculus
Vestibular
nuclear
complex
Vestibular
nuclear
complex
Nucleus ambiguus
Lateral
lemniscus
Lateral
lemniscus
Ce
re
br
al
pe
du
nc
le
Ce
re
br
al
pe
du
nc
le
Spinal
nucleus
(V)
Spinal
nucleus
(V)

M

edial le

m

niscu

s

M

edial le

m

niscu

s

Corpus

callosum

(splenium)

Corpus

callosum

(splenium)

Corpus

callosum

(rostrum)

Corpus

callosum

(rostrum)

Corpus

callosum

(body)

Corpus

callosum

(body)

Stria

terminalis

Stria

terminalis

Subcallosal arSubcallosal areaea

THALAMUSTHALAMUS

MIDBRAIMIDBRAINN

PONSPONS

TEGMENTUMTEGMENTUM

TECTUMTECTUM

MMEDULLAEDULLA

Pyramis

VIII

Pyramis

VIII

Nodulus

(remnant)

Nodulus

(remnant)

Floccular

peduncle

Floccular

peduncle

Interpositus

nucleus

Interpositus

nucleus Fourth

ventricle

(lateral recess)

Fourth

ventricle

(lateral recess)

Choroid

plexus

Choroid

plexus

FlocculuFlocculuss

Uvula

(remnant)

Uvula

(remnant)

Folium

VIIa

Fo lium

VIIa

Declive

VI

Declive

VI

Culmen

IV, V

Culmen

IV, V

Centralis

III

Centralis

III

Tuber

VIIb

Tuber

VIIb

Paraflocculus

(tonsil, extends from uvula

to hemisphere)

Paraflocculus

(tonsil, extends from uvula

to hemisphere )

V E R M I SV E R M I S

P

ar

am

ed

ia

n

lo

b

ul

e

P

ar

am

ed

ia

n

lo

b

ul

e

Bi

ventral

lo

Biventrabule

l

lo

bule

ANTERIOR LOBEANTERIOR LOBE

CENTRAL

LOBE

CENTRAL

LOBE

H

E

M

I

S

P

H

E

R

E

H

E

M

I

S

P

H

E

R

E

Preculminate fissure

A (separates centralis and culmen)

Primary fissure

B (separates anterior and central lobes)

Prepyramidal fissure

C (separates tuber and pyramis)

Cerebellar fissu res

CC

AA

AA

BB

BB

CC

SUBSSUBSTTANTIA INNOMINANTIA INNOMINAAT ATA

Anterior limAnterior limAnterior limbbb

CEREBELLUM

PLATE 57B