The Human Brain During the Third Trimester

GW26 Horizontal

CR 235 mm

Y16-59

Level 11: Section 780

TTeemmppoorraal lol lobbee

FrFrontal lobeontal lobe

Cerebellum

(vermis)

Cerebellum

(vermis)

Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

Cortical plate

Gyrus rGyrus rectuectuss

Orbital gyrusOrbital gyrus

Lateral

ventricle

Lateral

ventricl e

Fo

ur

th

ve

n

tr

ic

le

Fo

ur

th

ve

n

tr

ic

le

Olfactory peduncle Olfactory peduncle

Lateral fissure

Inferior temporal gyrus

White matter

11

22

66

77

8

9

55

33

44

Interhemispheric fissure

Parahip-

pocampal

gyrus

Parahip-

pocampal

gyrus

Superior

cerebellar

peduncle

Superior

cerebellar

peduncle Inferior

cerebellar

peduncle

Inferior

cerebellar

peduncle

Cer

ebellu

m

(deep nuclei

)

Cere

bellu

m

(deep nuclei

)

HypothalamusHypothalamus

Optic

chiasm

Optic

chiasm

AmygdalaAmygdala

Cerebral

peduncle

Cerebral

peduncle

PPontine grayontine gray

InterInterpeduncular nuc.peduncular nuc.

Abcucens

nucleus (VI)

Abcucens

nucleus (VI)

Trigeminal

nuclei (V)

Trigeminal

nuclei (V)

Locus

coeruleus

Locus

coeruleus

PPonsons

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

1 Rostral migratory stream

Te mporal neuroepithelium, subventricular

(^3) zone, and stratified transitional field
Pa rahippocampal neuroepithelium, subventricular
(^2) zone, and stratified transitional field
6 Amygdaloid glioepithelium/ependyma
7 Pontine glioepithelium/ependyma
8 External germinal layer (cerebellar)
4 Alve ar glioepithelium
5 Lateral migratory stream (cortical)
9 Subpial granular layer (cortical)
Layer I
See detail of brain core and
cerebellum in Plates 238A and B.
Damaged area
Damaged area
PLATE 226