The Human Brain During the Third Trimester

1

Dark areas

are artifacts

of mounting

medium

crystallization

Temporal

lobe

Te mporal

lobe

GW37 Coronal

CR 350 mm

Y217-

Level 6: Section 691

Induseum griseum

Pu

ta

m

en

Pu

ta

m

en

In

te

rn

al

ca

ps

ul

e

In

te

rn

al

ca

ps

ul

e

Lateral fissure

Optic chiasm

Superior frontal gyrus

Middle frontal gyrus

Precentral gyrus

Superior temporal gyrus

Middle temporal gyrus

Frontal

lobe

Frontal

lobe

Interhemispheric

fissure

Inferior frontal gyrus?

Insular gyrus

Lateral

ventricl e

Fornix

Primary olfactory cortex (piriform)

White matter

Cortical plate

Layer I

33

1010

1212

55

6

77

22 88

1111 1

1111

Cingulate

gyrus

Cingulate

gyrus

CingulumCingulum

Basal

ganglia

Basal

ganglia

Nucleus

accumbens

Nucleus

accumbens

99

Preoptic

area

Preoptic

area

Globus

pallidus

Glob us

pallidus

Bed nucleus of the

stria terminalis

Bed nucleus of the

stria terminalis

Endopiriform

nucleus

Endopiriform

nucleus

Olfactory

tubercle

Olfactory

tubercle

Third Third ventriclventriclee

Paracentral

lobule

Paracentral

lobu le

44

Anterior

commissure

Anterior

commissure

CorCorpus callosupus callosumm

2 Fr ontal neuroepithelium and subventricular zone

3 Fr ontal stratified transitional field

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

1 Rostral migratory stream

9 Anteromedial striatal neuroepithelium and subventricular zone

8 Anterolateral striatal neuroepithelium and subventricular zone

11 Diencephalic (preoptic) glioepithelium/ependyma

10 Strionuclear glioepithelium

12 Subpial granular layer (cortical)

5 Callosal sling

6 Fo rnical glioepithelium

7 Lateral migratory stream (cortical)

4 Callosal glioepithelium

See detail of brain core

in Plates 32A and B.

CCaauuddaattee ((bbooddyy))

Damaged areas in section

Claustrum

(infiltrated by the

lateral migratory

stream)

PLATE 6