The Human Brain During the Third Trimester

1313

GW26 Horizontal

CR 235 mm

Y16-59

Level 10: Section 740

TTeemmppoorraal lol lobbee

Frontal

lobe

Frontal

lobe

Cerebellum

(vermis)

Cerebellum

(vermis)

Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

Cortical plate

Gyrus rGyrus rectuectuss

Orbital gyrusOrbital gyrus

Lateral

ventricle

Lateral

ventricle

Primary olfactory cortex (piriform)

Fourth

ventricle

Fourth

Olfactory peduncle Olfactory peduncle ventricle

Lateral fissure

Damaged area

Middle and inferior temporal gyri

White matter

11

22

66

77

88

99

1111

1010

55

33

44

Interhemispheric fissure

Parahip-

pocampal

gyrus

Parahip-

pocampal

gyrus

Hippo-

campus

Hippo-

campus

Superior

cerebellar

peduncle

Superior

cerebellar

peduncle

C

er

eb

el

lu

m

(d

ee

p

nu

cl

ei

)

C

er

eb

el

lu

m

(d

ee

p

nu

cl

ei

)

HypothalamusHypothalamus

Optic

tract

Optic

tract

AmygdalaAmygdala

Cerebral

peduncle

Cere bral

peduncle

Substantia

nigra

Substantia

nigra

Trochlear

nucleus (IV)

Tr ochlear

nucleus (IV)

Locus

coeruleus

Locus

coeruleus

PPonsons

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

1 Rostral migratory stream

Pa rahippocampal neuroepithelium, subventricular

(^3) zone, and stratified transitional field
2 Fr ontal stratified transitional field
9 Amygdaloid glioepithelium/ependyma
10 Diencephalic (hypothalamic) glioepithelium/ependyma
11 Pontine glioepithelium/ependyma
12 External germinal layer (cerebellar)
6 Alve ar glioepithelium
7 Subgranular zone (dentate)
8 Lateral migratory stream (cortical)
13 Subpial granular layer (cortical)
4 Te mporal neuroepithelium and subventricular zone
5 Te mporal stratified transitional field
Layer I
12
TTe gmentumegmentum 12
MidbrainMidbrain
See detail of brain core and
cerebellum in Plates 237A and B.
PLATE 225