The Human Brain During the Third Trimester

Nucleus

accumbens

Nucleus

accumbens

GW37 Sagittal

CR 310 mm

Y180-61

Level 3: Section 841

Postcentral gyrus

Postcentral sulcus

Cingulate

sulcus

Cingulate

sulcus

Precuneus

Superior parietal

lobu le

Superior

frontal gyrus

Retro-

splenial

area

Retro-

splenial

area

Central sulcus

Precentral sulcus Precentral gyrus

Spleniu

m

Spleniu

m

Lateral hypothalamus

Basal

ganglia

Basal

ganglia

Occ

ipit

al

lob

Oc e

cip

ital

lob

e

Internal capsule

Optic tract

Cerebral peduncle

Forni

x

Forn

ix

Gyrus rectus?

Orbital gyrus?

Fourth ve ntricle

(lateral recess)

Substantia innominata

Olfactory bu lb

and peduncle

Cingula

te gyrus

Cingula

te gyrus Pa

ri

et

al

(^) l
ob
e
P
a
ri
et
al
(^) l
ob
e
ThalamusThalamus
MidbraiMidbrainn
Te
ct
um
Te
ct
um
Te
gm
ent
um
Te
gm
ent
um
MedullaMedulla
Cerebellum
(vermis)
Cere bellum
(vermis)
Cerebellum
(hemisphere)
PPonsons
Fr
on
ta
l^ l
ob
e
Fr
on
ta
l^ l
ob
e
Paracentral
lobule
Paracentral
lobu le
Sub-
thalamus
Sub-
thalamus
Paraflocculus (from left
side of brain)

C

or

puscallosum

C

or

puscallosum

Parieto-

occipital

sulcus

Parieto-

occipital

sulcus

Cing

ulu

m

Cing

ulu

m

Lat

eral

ventr

icle

Lat

eral

ventr

icle

See detail of brain core and

cerebellum in Plates 57A and B.

4

Accumbent neuroepithelium and subventricular zone

(infiltrated by the rostral migratory stream)

1 Rostral migratory stream

2 Rostral migratory stream (source area)

3 Callosal glioepithelium

7 Strionuclear glioepithelium

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

9 External germinal layer (cerebellum)

5 Anteromedial striatal neuroepithelium and subventricular zone

6 Anterolateral striatal neuroepithelium and subventricular zone

8 Pontine and medullary glioepithelium/ependyma

10 Subpial granular layer (cortical)

11

10

9

22

33 33

44

66

77

88

55

55

Damaged areas in section

Cortical plate

White matter

Layer I

PLATE 49