The Human Brain During the Third Trimester

GW26 Sagittal

CR 225 mm

Y147-63

Level 7: Section 341

Lateral ve ntricle

Lateral

ventricle

Subs

innomtantia

inata

Subs

innomtantia

inata

Primary olfactory cortex (piriform)

Primary Primary ffissuissurere

Parieto-

occipital

sulcus

Middle cerebellar peduncle

Inferior cerebellar peduncle

ThalamusThalamus

Paraflocculus?

Flocculus

Orbital gyrusOrbital gyrus

Parietal

lobe

Parietal

lobe

Frontal

lobe

Frontal

lobe

Paracen

tral^ lobu

le

Paracen

tral^ lobu

le

Frontal

lobe

Frontal

lobe

Sp

le

ni

um

Sp

le

ni

um

BBaassaall ggaanngglliiaa

Nucleu

accum s

bens

Nucleu

accum s

bens

Dorsal

hippo-

campus

Dorsal

hippo-

campus

Occipital

lobe

Occipital

lobe

Cortical plate

Postcentral gyrus

Precentral gyrus

White matter

L

at

e

ra

l^

ve

nt

ri

cl

e

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)

22 11

33

44 44

44

55

66

88

1010

1010

1212

1111

1313 17

1414

1515

16

18

18

18

99

77

C

or

pu

sc

all

osu

m

C

or

pu

sc

all

osu

m

Cingulate gyru

s

Cingulate gyru

s

Cingulate gyrus

(retr

osplenial ar

ea

)

Cingulate gyrus

(retrosplenial ar

ea

)

Central sulcus

Calcarine sulcuCalcarine sulcuss

Primary

visual

cortex

Primary

visual

cortex

For

nix

Forn

ix

Globus

pallidus

Globus

pallidus

C

au

da

te

C

au

da

te

A

m

yg

da

la

A

m

yg

da

la

PO

ST

ER

IO

R

C

O

M

LP

XE

PO

ST

ER

IO

R

C

O

M

LP

XE

V

EN

TR

AL

CO

MPLEX

V

EN

TR

AL

CO

MPLEX

Corona

radiata

Corona

radiata

Corona

radiata

Corona

radiata

Pa

ra

hi

pp

oc

am

pa

l^ g

yr

us

Pa

ra

hi

pp

oc

am

pa

l^ g

yr

us

Internal

ca

ps

ul

e

Internal

ca

ps

ul

e

Choroid

plexus

Choroid

plexus

Dentate nucleus

Cerebral

peduncle

Cere bral

peduncle

10 Alve ar glioepithelium

13 Amygdaloid glioepithelium/ependyma

12 Lateral migratory stream (cortical)

15 Anteromedial striatal neuroepithelium and subventricular zone

14 Anterolateral striatal neuroepithelium and subventricular zone

6 Occipital neuroepithelium and subventricular zone

7 Occipital stratified transitional field

8 Te mporal neuroepithelium and subventricular zone

9 Pa rahippocampal/temporal stratified transitional field

2 Fr ontal neuroepithelium and subventricular zone

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

17 External germinal layer (cerebellum)

16 Strionuclear glioepithelium

1 Rostral migratory stream (source area)

4 Callosal glioepithelium

5 Fo rnical glioepithelium

18 Subpial granular layer (cortical)

3 Fr ontal stratified transitional field

Layer I

11 Subgranular zone (dentate)

Ventral

hippo-

campus

Ve ntral

hippo-

campus

Damaged areas in section

See detail of brain core and

cerebellum in Plates 206A and B.

Te

m

po

ra

l

lo

Tembe

po

ra

l

lo

be

PLATE 196