The Human Brain During the Third Trimester

GW29 Coronal

CR 260 mm

Y14-59

Level 15: Section 1201

Precentral gyrus?

Postcentral gyrus

Postcentral gyrus?

Cingulate

gyrus

Cingulum

Induseum

griseum

Exte

rnal capsul

e

Exter

nal capsule

Supramarginal

gyrus

Fusiform

gyrus

Fusiform

gyrus

Pyramid (corticospinal tract)

Dorsal cochlear nucleus?

Choroid plexus

M

id

dl

e

ce

re

be

lla

r

pe

du

nc

le

M

id

dl

e

ce

re

be

lla

r

pe

du

nc

le

FourthFourthventricleventricle Ce

re

be

llu

m

(h

em

isp

he

re

)

C

er

eb

el

lu

m

(h

em

isp

he

re

)

Ve ntral cochlear nucleus?

Inferior olive complex

Principal sensory and spinal nucleus (V)

Medial lemniscus

Lateral lemniscus

Superior cerebellar peduncle

Brachium of the

inferior colliculus

Raphe nuclear complex

Locus

coeruleus

Moto r

nuc. (V)

Moto r

nuc. (V)

Moto r

nuc. (VII)

Moto r

nuc. (VII)

Mesen-

cephalic

nuc. (V)

Interhemi-

spheric fissure

Interhemi-

spheric fissure

Parietal

lobe

Parietal

lobe

Temporal

lobe

Te mporal

lobe

Central sulcus?

ThalamusThalamus

For

nix

For

nix

Lateral

ventricle

Lateral

ventricle

Hippocampal

commissure

Hippocampal

commissure

CorCorpus callosupus callosumm

Caudate

(tail)

Caudate

(tail)

Stria

terminalis

Stria

terminalis

Stria

terminalis

Stria

terminalis

PPonsons

I

s

th

m

u

s

I

s

th

m

u

s

Midbrain

MedullaMedulla

Dentate

gyrus

Dentate

gyrus

SSuubbiiccuulluumm

Ammon's

horn

Ammon's

horn

Cerebral

aqueduct

Cere bral

aqueduct

TTeeccttuumm

Central

gray

Central

gray

Para-

hippocampal

gyrus

Para -

hippocampal

gyrus

Inferior

colliculus

Inferior

colliculus

Superior

colliculus

Superior

colliculus

Internal

capsule

Internal

capsule

Reticular

formatio

n

Reticular

formatio

n

R

et

ic

ul

ar

fo

rm

at

io

n

R

et

ic

ul

ar

fo

rm

at

io

n

Dark areas are artifacts of

mounting medium

crystallization

1 Pa racentral/parietal neuroepithelium and subventricular zone

2 Pa racentral/parietal stratified transitional field

14 External germinal layer (cerebellum)

13 Raphe migration

12 Isthmal and pontine glioepithelium/ependyma

11 Mesencephalic glioepithelium/ependyma

9 Te mporal neuroepithelium and subventricular zone

Pa rahippocampal neuroepithelium, subventricular zone,

and stratified transitional field

8

10 Te mporal stratified transitional field

6 Alve ar glioepithelium

3 Callosal glioepithelium

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

7 Subgranular zone (dentate)

Hippo-

campus

Hippo-

campus

33

11

22

44

44

55

66

88

99

77

14

1313

15

15

14

1111

1212

1010

Lateral

fissure

Layer I

Cortical plate

White matter

See detail of brain core and cerebellum

in Plates 186A and B.

4 Po sterior striatal neuroepithelium and subventricular zone

5 Strionuclear neuroepithelium/glioepithelium

Paracentral

lobule

Paracentral

lobu le

Inferior

temporal

gyrus

Middle

temporal

gyrus

15 Subpial granular layer (cortical)

Damaged areas in section

PLATE 165

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