The Human Brain During the Third Trimester

Paracentral

lobule

Paracentral

lobule

F

r

o

n

ta

l lo

b

e

F

r

o

n

ta

l lo

b

e

Cin

gul

gyruate

s

Cin

gul

gyruate

s

Cingulate gyrus

(retrosplenial area)

Cingulate gyrus

(retrosplenial area)

Superior frontal

gyrus

Cingulum

Middle frontal gyrus

Precentral gyrus

Lateral fissure

Postcentral gyrus

Superior

parietal

lobu le

Supramarginal and angular gyri

Central sulcus

Interhemispheric fissure

ThalamusThalamus

Th

ala

mu

s

Th

ala

mu

s

Fo

rnix

Fo

rnix

For

nix

For

nix

Internal^ ca

psule

Internal^ ca

psule

CCllaauussttrruumm

IInnssuullaarr ggyyrruuss

BBaassaall ggaanngglliiaa

C

or

pu

scall

osum

C

or

pu

scall

osum

SpleniumSplenium

SpleniumSplenium

P

arietal lobe

Parietal lobe

La

te

ra

lv

ent

ricle

GW30 Horizontal

CR 260 mm

Y187-65

Level 3: Section 441

The splenium of the corpus callosum was cut during processing.

C

or

pu

sc

al

los

um

C

or

pu

sc

al

los

um

GenuGenu

Stria

terminalis

Stria

terminalis

Stria

terminalis

Stria

terminalis

Choroid

plexus

Choroid

plexus

Induseum

griseum

11

22

66

77

77

55

55

33

33

44

99

88

11

12

1111

1111

1010

Pr

ecuneus?

Pr

ecuneus?

Layer I

Cortical plate

White matter

See detail of brain core

in Plates 132A and B.

1 Fr ontal neuroepithelium and subventricular zone

2 Fr ontal stratified transitional field

3 Callosal glioepithelium

4 Callosal sling

5 Fo rnical glioepithelium

8 Po sterior striatal neuroepithelium and subventricular zone

10 Anteromedial striatal neuroepithelium and subventricular zone

9 Anterolateral striatal neuroepithelium and subventricular zone

11 Strionuclear glioepithelium

6 Pa rietal neuroepithelium and subventricular zone 12 Subpial granular layer (cortical)

7 Pa rietal stratified transitional field

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

PLATE 114