The Human Brain During the Third Trimester

GW29 Coronal

CR 260 mm

Y14-59

Level 14: Section 1161

Precentral gyrus

Postcentral gyrus

Postcentral gyrus

Supramarginal

gyrus

Supramarginal

gyrus?

Cingulate

gyrus

Cingulum

Induseum

griseum

Ex

te

rn

al

c

ap

su

le

Ex

te

rn

al

c

ap

su

le

Pyramid (corticospinal tract)

Arcuate nucleus (medulla)

Pontine gray

Middle cerebellar peduncle

Cere bellum (hemisphere )

Ve ntral cochlear nucleus

Inferior olive complex

Superior olive complex

Nerve V

Medial lemniscus

Lateral lemniscus

Raphe nuclear complex

Raphe nuclear complex

Abducens

nucleus (VI)?

Abducens

nucleus (VI)?

Interhemi-

spheric fissure

Parietal

lobe

Parietal

lobe

Temporal

lobe

Te mporal

lobe

Central sulcus

ThalamusThalamus

FFoorrnniixx

Lateral

ventricle

Lateral

ventricle

Lateral

ventricle

Caudate CorCorpus callosupus callosumm

(tail)

Caudate

(tail)

In

te

rn

al

c

ap

su

le

In

te

rn

al

c

ap

su

le

Stria

terminalis

Stria

terminalis

PPonsons

MidbraiMidbrainn

MedullaMedulla

Dentate

gyrus

Dentate

gyrus

SSuubbiiccuulluumm

Ammon's

horn

Ammon's

horn Sup

er

io

r

co

llic

ul

us

Su

pe

ri

or

co

llic

ul

us

Cerebral

aqueduct

Cere bral

aqueduct

TTe gmentumegmentum

T

ec

tu

m

T

ec

tu

m

Central

gray

Central

gray

Para-

hippocampal

gyrus

Para -

hippocampal

gyrus

Inferior

temporal

gyrus

Middle

temporal

gyrus

K

See this area of cortex

in Plate 172.

1 Pa racentral/parietal neuroepithelium and subventricular zone

2 Pa racentral/parietal stratified transitional field

14 Subpial granular layer (cortical)

10 Te mporal stratified transitional field

9 Te mporal neuroepithelium and subventricular zone

6 Alve ar glioepithelium

3 Callosal glioepithelium

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

7 Subgranular zone (dentate)

Posterior

complex

Po sterior

complex

Hippo-

campus

Hippo-

campus

33

11

22

44

44

55

66

88

99

77

14

1111

1010

13

Reticular

belt

Reticular

belt Lateral

fissure

Layer I

Cortical plate

White matter

13 External germinal layer (cerebellum)

12 Raphe migration

13

1212

Pa rahippocampal neuroepithelium, subventricular zone,

and stratified transitional field

8

4 Po sterior striatal neuroepithelium and subventricular zone

5 Strionuclear glioepithelium

See detail of brain core and cerebellum

in Plates 185A and B.

Paracentral

lobule

Paracentral

lobu le

11 Mesencephalic glioepithelium/ependyma

Fusiform

gyrus

Fusiform

gyrus

PLATE 164