The Human Brain During the Third Trimester

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C o rC o r o n a r a d i a to n a r a d i a taa

Mid
dle^
fron
tal^
gyru

s

Mid
dle^
fron
tal^
gyru

s

In
su
la
r
gy
ru
s

In
su
la
r
gy
ru
s
Orbital
gyrus

Orbital
gyrus

Lateral
ventricle

Lateral
ventricle
Choroid
plexus

Choroid
plexus

Pa
ra
hip

po
cam

pa
l^ g
yru

s

Pa
ra
hip

po
cam

pa
l^ g
yru

s

Parieto-
occipital
sulcus

Precentral gyrus Postcentral gyrus

Supramarginal gyrus

Angular gyrus

Central sulcus

Inferior
frontal
gyrus

Inferior
frontal
gyrus

Primary olfactory
cortex (piriform)

Anterior
commissure

Anterior
commissure

Internal
capsule

Internal
capsule

ClaustruClaustrumm

La
te
ral

ven
tri
cle
Lateral
ventricle

Lateral
ventricl e

Endopiriform
nucleus

Endopirifo rm
nucleus

External
capsule

External
capsule

UncuUncuss

Parietal
lobe

Parietal
lobe

Th
ala
mu

s

Th
ala
mu

s

Hi
pp
oca

mp

us

Hi
pp
oca

mp

us

Basal
ganglia

Basal
ganglia

Frontal
lobe

Frontal
lobe

AmygdalaAmygdala

Cerebellum
(Hemisphere)

Cerebellum
(Hemisphere )

GW32 Sagittal


CR 270 mm


Y15-60


Level 5: Section 481


See detail of brain core and


cerebellum in Plates 106A and B.


Occipital
lobe

Occipital
lobe

Paracentral
lobule

Paracentral
lobu le

Damaged areas in section

Lingula?Lingula?

8 Lateral migratory stream (cortical)


9 Amygdaloid glioepithelium/ependyma


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


12 External germinal layer (cerebellum)


10 Po sterior striatal neuroepithelium and subventricular zone


13 Subpial granular layer (cortical)


1 Fr ontal stratified transitional field


5 Fo rnical glioepithelium


6 Alve ar glioepithelium


7 Subgranular zone (dentate)


11 Strionuclear glioepithelium


3


Occipital neuroepithelium, subventricular zone,
and stratified transitional field

4


Pa rahippocampal neuroepithelium, subventricular zone,
and stratified transitional field

2


Pa rietal neuroepithelium, subventricular zone, and
stratified transitional field

77


88


88


1111


12


13


13


33


55


66


11


22


44


99


1010


Cortical plate

White matter

Layer I

PLATE 100

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