The Human Brain During the Third Trimester

GW26 Horizontal

CR 235 mm

Y16-59

Level 12: Section 820

TTeemmppoorraal lol lobbee

FrFrontal lobeontal lobe

Cerebellum

(vermis)

Cere bellum

(vermis)

Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

Gyrus rGyrus rectuectuss

Orbital gyrusOrbital gyrus

F

ou

rt

h

ve

nt

ri

cl

e

F

ou

rt

h

ev

nt

ri

cl

e

Olfactory peduncle Olfactory peduncle

Inferior temporal gyrus

White matter

Cortical plate

11

22

33

44

6

7

55

Interhemispheric fissure

Middle cerebellar peduncle

Inferior cerebellar peduncle

Gracile

fasciculus

Cuneate

fasciculus

Lateral

funiculus

Hypothalamus Spinal cord

Optic nerve

Damaged area

Damaged area

Transpontine corticofugal tract

Pontine gray

Trigeminal nuclei (V)

Vestibular nuclear complex

PPonsons

MedullaMedulla

Entor

hin

al

co

rte

x

Entor

hin

al

co

rte

x

Lateral fissure

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
zone, and stratified transitional field
2
4 Amygdaloid glioepithelium/ependyma
5 Medullary glioepithelium/ependyma
6 External germinal layer (cerebellar)
7 Subpial granular layer (cortical)
Layer I
See detail of brain core and
cerebellum in Plates 239A and B.
PLATE 227