The Human Brain During the Third Trimester

CoCorpus callosurpus callosumm

K

See this area of cortex

in Plates 27 and 28

GW37 Coronal

CR 350 mm

Y217-65

Level 18: Section 1371

See detail of brain core and

cerebellum in Plates 44A and B.

Damaged areas in section

Temporal

lobe

Temporal

lobe

Cuneate nucleus

Spinal nucleus (V)

Pyramidal decussation

Floccular peduncle

Primary

visual cortex

Middle and inferior

cerebellar peduncles

Superior parietal lobu le

Supramarginal

gyrus

Angular gyrus

Middle

temporal

gyrus

Lingula?

Inferior temporal

gyrus

Cingulate

gyrus

(retrosplenial

area)

Cingulate

gyrus

(retrosplenial

area)

Parietal

lobe

Parietal

lobe

Interhemispheric

fissure

Lateral

ventricle

Lateral

ventricl e

Fourth

ventricle

Fourth

ventricle

VVeermrmisis

VVerermmisis

White

matter

Cortical plate

Layer I

33

1010

1111

1212

55

66

77

88

22

11

99

99

44

MedullaMedulla

C

er

eb

ellu

m

H

em

isp

her

e

H

em

isp

her

e

Choroid

plexus

Choroid

plexus

Choroid

plexus

Choroid

plexus

Occipital

lobe

Occipital

lobe

PrPrecuneusecuneus

CuneusCuneus

PrPrecuneusecuneus

De

ep

(^) nu
cle
i
De
ep
(^) nu
cle
i
1 Pa rietal neuroepithelium and subventricular zone 7 Te mporal neuroepithelium and subventricular zone
5 Occipital neuroepithelium and subventricular zone
4 Cingulate stratified transitional field
2 Pa rietal stratified transitional field 8 Te mporal stratified transitional field
6 Occipital stratified transitional field
Remnants of the germinal matrix, migratory streams, and transitional fields
12 Subpial granular layer (cortical)
9 External germinal layer (cerebellum)
10 Germinal trigone (cerebellum)
11 Medullary glioepithelium/ependyma
Callosal glioepithelium (intermingled with cingulate
neuroepithelium and subventricular zone)
3
PLATE 18