The Human Brain During the Third Trimester

Remnants of the germinal matrix, migratory streams, and transitional fields GW26 Horizontal

CR 235 mm

Y16-59

Level 8: Section 660

TTeemmppoorraal lol lobbee

Frontal

lobe

Frontal

lobe

Cerebellum

(vermis)

Cere bellum

(vermis)

Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

Cortical plate

Middle

frontal

gyrus

Orbital gyrus

Lateral

ventricle

Lateral

ventricle

Primary olfactory cortex (piriform)

Cerebral

aqueduct

Cere bral

aqueduct

Lateral fissure

Middle and inferior temporal gyri

SSuubbccaalllloossaall aarreeaa

White matter

22 11

66

77

55

88

99

99

33

44

Interhemispheric fissure

N

u

cl

eu

s

ac

cu

m

be

ns

N

u

cl

eu

s

ac

cu

m

be

ns

Inferior

colliculus

Inferior

colliculus

Parahip-

pocampal

gyrus

Parahip-

pocampal

gyrus

Hippo-

campus

Hippo-

campus

Substantia

nigra

Substantia

nigra

Lateral

lemniscus

HypothalamusHypothalamus

Third Third ventriclventriclee Red

nucleus

Red

nucleus

Central

gray

Central

gray

Optic

tract

Optic

tract

Insular gyrus

Anterior

commissure

Anterior

commissure

AmygdalAmygdalaa

A

m

yg

d

ala

A

m

yg

d

ala

Cerebral

peduncle

Cere bral

peduncle

Su

bs

ta

nt

ia

in

no

m

in

at

a

Su

bs

ta

nt

ia

in

no

m

in

at

a

2 Fr ontal neuroepithelium and subventricular zone

1 Rostral migratory stream

Pa rahippocampal neuroepithelium, subventricular

zone, and stratified transitional field

4

3 Fr ontal stratified transitional field 10 Amygdaloid glioepithelium/ependyma

11 Diencephalic (hypothalamic) glioepithelium/ependyma

12 Mesencephalic glioepithelium/ependyma

13 External germinal layer (cerebellar)

7 Alve ar glioepithelium

8 Subgranular zone (dentate)

9 Lateral migratory stream (cortical)

14 Subpial granular layer (cortical)

5 Te mporal neuroepithelium and subventricular zone

6 Te mporal stratified transitional field

1010

1111

1212

13

13

14

Layer I

TTe gmentumegmentum TTectuectumm

MidbrainMidbrain

See detail of brain core and

cerebellum in Plates 235A and B.

PLATE 223

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