The Human Brain During the Third Trimester

GW30 Horizontal

CR 260 mm

Y187-65

Level 13: Section 881

Gyru

s rec

tus

Gyru

s rec

tus

Fusiform

gyrus?

Fusiform

gyrus?

Orbital gyri

Lateral fissure

Third Third ventricleventricle

TTeemmppoorraal lol lobbee

Occipital

lobe

Occipital

Interhemispheric lobe

fissure

Frontal

lobe

Frontal

lobe

Hypo-

thalamus

Hypo-

thalamus

MMiiddbbrraaiinn

Para-

hippocampal

gyrus

Para -

hippocampal

gyrus

Middle temporal gyrus

Inferior temporal gyrus

Layer I

Cortical plate

White matter

11

22

33

44

55

66

77

88

99

1010

11

1312

TTe gmentumegmentum

CerCere bral aqueducebral aqueductt

Ce

re

bra

lpe

duncle

Ce

re

bra

lpe

duncle

Substantia

nigra

Substantia

nigra

Olfactory

peduncle

Olfactory

peduncle

A

m

y

g

d

a

la

A

m

y

g

d

a

la

Optic

chiasm

Central

nucleus

Central

nucleus

Corticomedial

complex

Corticomedial

complex

Cere bellum

(vermis)

Latera

vent l

ricle

H

ip

p

o

ca

mp

us

H

ip

p

o

ca

mp

us

L

at

er

al

vent

ricle

L

at

er

al

vent

ricle

B

as

ol

at

er

al

co

m

pl

ex

B

as

ol

at

er

al

co

m

pl

ex

Primary olfactory

cortex (piriform)

Pa rahippocampal neuroepithelium, subventricular

(^2) zone, and stratified transitional field
4 Occipital stratified transitional field
5 Te mporal neuroepithelium and subventricular zone
1 Rostral migratory stream
3 Occipital neuroepithelium and subventricular zone
6 Te mporal stratified transitional field
10 Amygdaloid glioepithelium/ependyma
7 Alve ar glioepithelium
9 Lateral migratory stream (cortical)
8 Subgranular zone (dentate gyrus)
12 Subpial granular layer (cortical)
11 External germinal layer (cerebellum)
Remnants of the germinal matrix, migratory streams, and transitional fields
See detail of brain core and
cerebellum in Plates 142A and B.
TTectuectumm
Damaged areas in section
PLATE 124