The Human Brain During the Third Trimester

Lateral Lateral ffissuissurree

Supramarginal

gyrus

Angular gyrus

Precentral gyrus

Precentral sulcus

Postcentral gyrus

Postcentral sulcus

Central sulcus

Insular

gyrus

Insular

gyrus

Inferior

frontal

gyrus

Inferior

frontal

gyrus

Fusiform gyrus?

Superior temporal gyrus?

Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

22

33

44

9

1010

1010

55

88

77

66

Anterior

commissure

Anterior

commissure

Amygdal

a

Amygdal

a

UncuUncuss

Hi

pp

oc

am

pu

s

Hi

pp

oc

am

pu

s

Primary olfactory cortex (piriform)

Endopiriform nucleus

Internal

capsule

Internal

capsule

111

Parietal

lobe

Parieta l

lobe

Basal

gan

B glia

asal

gan

glia

Te

m

po

ra

l

lo

be

Te

m

po

ra

l

lo

be

Te

m

po

ra

l

lo

be

Frontal

lobe

Frontal

lobe

GW32 Sagittal

CR 270 mm

Y15-60

Level 6: Section 421

Paracentral

lobule

Paracentral

lobu le

ClaustruClaustrumm

ExterExternal capsulnal capsulee

Lateral

ventricle

Choroid

plexus

Choroid

plexus

La

ter

al

ven

tri

cle

Parahippocam

pal gyru

s

Parahippocampal gyrus

Middle fr

ontal gyrus

Middle fr

ontal gyrus

Orbital

gyrus

Orbital

gyrus

Occipital

lobe

Occipital

lobe

See detail of brain core and

cerebellum in Plates 107A and B.

Cortical plate

White matter

Layer I

5 Lateral migratory stream (cortical)

6 Amygdaloid glioepithelium/ependyma

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

9 External germinal layer (cerebellum)

7 Po sterior striatal neuroepithelium and subventricular zone

10 Subpial granular layer (cortical)

4 Alve ar glioepithelium

8 Strionuclear glioepithelium

2

Occipital neuroepithelium, subventricular zone,

and stratified transitional field

3

Pa rahippocampal neuroepithelium, subventricular zone,

and stratified transitional field

1

Pa rietal neuroepithelium, subventricular zone, and

stratified transitional field

Damaged areas in section

PLATE 101