The Human Brain During the Third Trimester

GW26 Sagittal

CR 225 mm

Y147-63

Level 8: Section 321

Lateral ve ntricle

La

ter

al

ven

tri

cle

Substantia

innominata

Substantia

innominata

Primary olfactory cortex (piriform)

Primary Primary ffissuissurree

Parieto-

occipital

sulcus

Middle cerebellar peduncle

Inferior cerebellar peduncle

ThalamusThalamus

Flocculus

Orbital gyrusOrbital gyrus

Parietal

lobe

Parietal

lobe

Paracent

ral^ lobule

Paracent

ral^ lobule

Frontal

lobe

Frontal

lobe

Te

m

p

or

al

lo

Tembe

p

or

al

lo

be

BBaassaall ggaanngglliiaa

V

en

tr

al

hi

pp

oc

am

pu

s

V

en

tr

al

hi

pp

oc

am

pu

s

Dorsal

hippo-

campus

Dorsal

hippo-

campus

Occipital

lobe

Occipital

lobe

Cortical plate

Postcentral gyrus

Precentral gyrus

White matter

Cere bellum

(hemisphere )

An

teri

or

lob

Ant e

erio

r

lob

e

Simplex

lobule

Simplex

lobule

Ansiform

lobule

(crus II)

Ansiform

lobu le

(crus II)

Biventral lobule

Paramedian lobule

Ansiform

lobule

(crus I)

Ansiform

lobu le

(crus I)

11

22

22

33

33

44

55

66

66

88

1010

99

1111

1414

1212

1313

1616 1313

1717

1818

1515

20

20

19

77

Cingulate gyrus

(retr

osplenial ar

ea

)

Cingulate gyrus

(retrosplenial ar

ea

)

Central sulcus

Calcarine sulcuCalcarine sulcuss

Primary

visual

cortex

Primary

visual

cortex

FFornorniixx

Globus

pallidus

Globus

pallidus

Ca

ud

ate

Ca

ud

ate

Am

yg

da

la

Am

yg

da

la

PO

ST

ER

IO

R

C

O

M

LP

XE

PO

ST

ER

IO

R

C

O

M

LP

XE

V

NE

T

R

A

LC

OM

PLEX

V

NE

T

R

A

LC

OM

PLEX

Corona

radiata

Corona

radiata

Corona

radiata

Corona

radiata

Intern

al

ca

ps

ul

e

Intern

al

ca

ps

ul

e

Choroid

plexus

Choroid

plexus

Cerebral

peduncle

Cere bral

peduncle

Lateral

ventricle

Lateral

ventricle

Cor

pus

cal

losu

m

Cor

pus

cal

losu

m

12 Alve ar glioepithelium

15 Amygdaloid glioepithelium/ependyma

14 Lateral migratory stream (cortical)

16 Anterolateral striatal neuroepithelium and subventricular zone

17 Anteromedial/posterior striatal neuroepithelium and subventricular zone

8 Occipital neuroepithelium and subventricular zone

9 Occipital stratified transitional field

10 Te mporal neuroepithelium and subventricular zone

11 Te mporal stratified transitional field

2 Fr ontal neuroepithelium and subventricular zone

4 Pa racentral neuroepithelium and subventricular zone

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

19 External germinal layer (cerebellum)

18 Strionuclear glioepithelium

1 Rostral migratory stream (source area)

6 Callosal glioepithelium

7 Fo rnical glioepithelium

20 Subpial granular layer (cortical)

3 Fr ontal stratified transitional field

5 Pa racentral stratified transitional field

PutamenPutamen

Layer I

13 Subgranular zone (dentate)

Damaged areas in section

See detail of brain core and

cerebellum in Plates 207A and B.

PLATE 197