The Human Brain During the Third Trimester

GW29 Coronal

CR 260 mm

Y14-59

Level 18: Section 1361

Cingulate gyrus

(retrosplenial area)

Cingulate gyrus

(retrosplenial area)

Superior parietal lobu le

PrPrecuneusecuneus

Angular gyrus

Pyramid (corticospinal tract)

Pyramidal decussation

Inferior cerebellar peduncle and

spinocerebellar tracts

Central canal surrounded by 9

Choroid

plexus

Choroid

plexus

Choroid

plexus

Choroid

plexus

Fourth

ventricle

Fourth

ventricl e

C

er

eb

el

lu

m

(h

em

is

ph

er

e)

C

er

eb

el

lu

m

(h

em

is

ph

er

e)

Spinal nucleus and tract (V)

Accessory nucleus (XI)

Cuneate nucleus

External cuneate nucleus

Area postrema

Raphe nuclear complex

Interhemi-

spheric fissure

Parietal

lobe

Parietal

lobe

Lateral

ventricle

Lateral

ventricle

MedullaMedulla

Cerebellum

(vermis)

Cere bellum

(vermis)

Dentate nucleus

Interpositus nucleus

Fastigial nucleus

Ce

re

be

llu

m

(d

ee

p

n

uc

le

i)

Ce

re

be

llu

m

(d

ee

p

n

uc

le

i)

Reticular formation

Spinocephalic tract?

Layer I

Cortical plate

White matter

1 Pa rietal neuroepithelium and subventricular zone

2 Pa rietal stratified transitional field

4 Occipital neuroepithelium and subventricular zone

10 Subpial granular layer (cortical)

9 Spinomedullary glioepithelium/ependyma

3 Callosal glioepithelium 8 External germinal layer (cerebellum)

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

5 Occipital stratified transitional field

33

11

22

44

55

66

8

8

10

77

Oc

cip

ita

l^ g

yr

i

Oc

cip

ita

l^ g

yr

i

Occipital

lobe

Occipital

lobe

See detail of brain core and cerebellum

in Plates 189A and B.

7 Te mporal stratified transitional field

6 Te mporal neuroepithelium and subventricular zone

Precuneus

Middle

temporal

gyrus?

Inferior

temporal

gyrus?

Cuneus?Cuneus?

Temporal

lobe

Te mporal

lobe

Damaged areas in section

PLATE 168