The Human Brain During the Third Trimester

PLATE 75

10 mm

GW37 Horizontal

CR 320 mm

Y301-62

Level 11: Section 981

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

1 Rostral migratory stream

2 Fo rnical glioepithelium

8 Lateral migratory stream (cortical)

9 Amygdaloid glioepithelium

3

Pa rahippocampal neuroepithelium, subventricular

zone and stratified transitional field

4 Te mporal neuroepithelium and subventricular zone

5 Te mporal stratified transitional field

6 Alve ar glioepithelium

7 Subgranular zone (dentate)

Inferior temporal

gyrus?

Third vThird ventricleentricle

Lateral fissure

Orbital gyri

Frontal

lobe

Frontal

lobe

GGyyrruuss rreeccttuuss

HYPO-

THALAMUS

HYPO-

THALAMUS

Inferior

colliculus

Inferior

colliculus

TTectuectumm

TTe gmentumegmentum

Para-

hippocampal

gyrus

Para -

hippocampal

gyrus

Superior temporal gyrus

Middle temporal gyrus

Interhemispheric fissure

Occipital

lobe

Occipital

lobe

11

22

66

55

33

44

77

88

99

Layer I

Cortical plate

White matter

Temporal

lobe

Te mporal

lobe

H

ip

po

ca

m

pu

s

H

ip

po

ca

m

pu

s

MIDBRAIMIDBRAINN

VVermisermis CEREBELLUMCEREBELLUM

AM HemispheHemispherree

Y

G

D

A

L

A

A

M

Y

G

D

A

L

A

Fusiform

gyr

us

?

Fusiform

gyr

us

?

10 External germinal layer (cerebellum)

10

Primary olfactory

cortex (piriform)

Primary olfactory

cortex (piriform)

Cerebral

aqueduct

Cere bral

aqueduct

Olfactory

peduncle

Olfactory

peduncle

See detail of brain core and

cerebellum in Plates 89A and B.