The Human Brain During the Third Trimester

Fi

m

br

ia

Fi

m

br

ia

GW29 Coronal

CR 260 mm

Y14-59

Level 17: Section 1301

Cingulate

gyrus

Cingulate gyru

s

(ret

rosplen

ial ar

ea)

Cingulate gyru

s

(ret

rosplenial ar

ea)

Cingulum

Induseum

griseum

Superior parietal lobu le

Superior parietal lobu le

Pyramid (corticospinal tract)

Inferior cerebellar peduncle and

spinocerebellar tracts

Choroid

plexus

Choroid

plexus

Choroid

plexus

Choroid

plexus

Fourth

ventricle

Fourth

ventricle

Vesti bular

nuclear

comple x

Vestibular

nuclear

comple x

C

er

eb

el

lu

m

(h

em

is

ph

er

e)

C

er

eb

el

lu

m

(h

em

is

ph

er

e)

Inferior olive complex

Spinal nucleus and tract (V)

Solitary nucleus and tract

Cuneate nucleus

Hypoglossal nucleus (XII)

Dorsal motor nucleus (X)

Medial lemniscus

Raphe nuclear complex

Lateral reticular nucleus

Interhemi-

spheric fissure

Parietal

lobe

Parietal

lobe

Temporal

lobe

Te mporal

lobe

Lateral

ventricle

Lateral

ventricle

Hippocampal

commissure

Fasciola

cinereum

MedullaMedulla

Para-

hippocampal

gyrus

Para -

hippocampal

gyrus

Cerebellum

(vermis)

Cere bellum

(vermis)

Middle and inferior

cerebellar peduncles

Dentate nucleus

Interpositus nucleus

Fastigial nucleus

Corpus

callosum

(splenium)

Ce

re

be

llu

m

(d

ee

p

nu

cl

ei

)

Ce

re

be

llu

m

(d

ee

p

nu

cl

ei

)

Reticular formation

Angular

gyrus

K

See this area of cortex

in Plate 173.

Middle

temporal

gyrus

Precuneus

Inferior

temporal

gyrus

Layer I

Cortical plate

White matter

Oc

ci

pit

al

gy

Occ ri

ip

ita

l

gy

ri

O

cc

ip

ita

l

lo

b

e

O

cci

p

ita

l

lo

b

e

1 Pa rietal neuroepithelium and subventricular zone

2 Pa rietal stratified transitional field

4 Fi mbrial glioepithelium

8 Te mporal stratified transitional field

9 Medullary glioepithelium/ependyma

10 Germinal trigone (cerebellum)

7 Te mporal neuroepithelium and subventricular zone

5 Occipital neuroepithelium and subventricular zone 11 External germinal layer (cerebellum)

3 Callosal glioepithelium

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

6 Occipital stratified transitional field

33

11

22

44

55

66

88

1010

99

11

12

11

77

See detail of brain core and cerebellum

in Plates 188A and B.

Cuneus?Cuneus?

12 Subpial granular layer (cortical)

PrPrecuneusecuneus

Damaged areas in section

PLATE 167

pjwstk|402064|1435432943