The Human Brain During the Third Trimester

GW26 Horizontal

CR 235 mm

Y16-59

Level 2: Section 340

Frontal

lobe

Frontal

lobe

Cortical plate

Superior and middle

frontal gyri

Internal capsule

(anterior limb)

Stria terminalis

Claustrum

External capsule

Internal capsule

(posterior limb)

Lateral ve

ntricle

Lateral

ven

tricle

Lateral ventricl

e

Late

ral^ v

entri

cle

Late

ral^ v

entri

Choroid cle

plexus

Choroid

plexus

Precentral gyrus

Postcentral gyrus

Postcentral sulcus

Lateral Lateral ffissuissurree

Supramarginal gyrus

Angular gyrus

Precuneus

Superior

parietal

lobu le

CCiningguulalatete ggyyrruuss Cingulate gyru

s

Cingulate gyru

s

Central sulcus

White matter

11

22

66

66

55

55

33

33

44

P

ar

ac

entra

l

lo

b

u

le

P

ar

ac

entra

l

lo

b

u

le

Interhemispheric fissure Interhemispheric fissure

Co

rp

us

ca

llo

su

m

g(

ne

)u

Co

rp

us

ca

llo

su

m

g(

ne

)u

roC

up

cs

lla

o

su

m

(s

pl

en

iu

m)

roC

up

cs

lla

o

su

m

(s

pl

en

iu

m)

InInsusular gyrular gyruss

77

99

88

CaudatCaudatee ThalamusThalamus

Th

ala

mu

s

Th

ala

mu

Basal gangliaBasal ganglia s

IInntteerrnnaallccaappssuullee

Putam

en

Putam

en

1 Fr ontal neuroepithelium and subventricular zone

10 Strionuclear glioepithelium

8 Anterolateral striatal neuroepithelium and subventricular zone

9 Anteromedial striatal neuroepithelium and subventricular zone

7 Po sterior striatal neuroepithelium and subventricular zone

2 Fr ontal stratified transitional field

3 Callosal glioepithelium

4 Fo rnical glioepithelium

5 Pa rietal neuroepithelium and subventricular zone

6 Pa rietal stratified transitional field

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

11 Subpial granular layer (cortical)

11

1010

Layer I

FFornixornix

FFornixornix

FFornixornix

Hippocampal

commissure?

Hippocampal

commissure?

Cho

roid

ple

xus

Cho

roid

ple

xus

PParietal lobearietal lobe

PLATE 217