The Human Brain During the Third Trimester

An

te

ri

or

lo

be

(H

I-H

V

)

An

te

ri

or

lo

be

(H

I-H

V

)

Uvula

(IX)

Uvula

(IX)

Lateral Lateral ventricleventricle

Temporal

lobe

Te mporal

lobe

Frontal

lobe

Frontal

lobe

Rostral migratory streaRostral migratory streamm

Lateral fissure

Damaged area

Damaged area

Damaged area

Anterior

olfactory

nucleus?

Layer I

Layer II

Layer III

Layer IV

Layers V- VI

Subpial granular layer

Cortical plate

White matter

Orbital gyrusOrbital gyrus

Gyrus Gyrus rrectuectuss

Primary

fissure

Pyramis

(VIII)

Pyramis

(VIII)

Nodulus

(X)

Nodulus

(X)

De

nta

te^ n

ucle

us

De

nta

te^ n

ucle

us

Si

m

pl

ex

l

ob

ul

e

(H

V

I)

Si

m

pl

ex

l

ob

ul

e

(H

V

I)

Ansiform

lobule

(Crus I HVIIA)

Ansiform

lobu le

(Crus I HVIIA)

Ansiform

lobule

(Crus II HVIIA)

Ansiform

lobu le

(Crus II HVIIA)

Lateral lemniscus

Fourth

ventricle

Fourth ventricle

(lateral recess)

Fourth ventricle

(lateral recess)

CEREBELLAR CEREBELLAR VERMISVERMIS

CEREBELLAR

HEMISPHERE

CEREBELLAR

HEMISPHERE

Parahippocampal

gyrus

Parahippocampal

gyrus

External

germinal

layer

Inter

ped-

nucleusnucleusuncularuncularInterped-

Locus

coeruleus

Locus

coeruleus

Parabrachial

nucleus

Parabrachial

nucleus

Abducens

nucleus (VI)

Abducens

nucleus (VI)

Raphe nuclear complexRaphe nuclear complex

Lateral migratory stream

(entering the amygdala and temporal cortex)

Medial longitudinal fasciculuMedial longitudinal fasciculuss

Baso-

lateral

complex

Baso-

lateral

complex

Reticular

formation

Reticular

formatio n

Paramedian

lobule?

(HVIIB)

Paramedian

lobu le?

(HVIIB)

Optic chiasmOptic chiasm

Olfactory

peduncle

Olfactory

peduncle

Oculomotor

nerve (III)

Tr anspontine

corticofugal tract

PONSPONS

C

e

re

b

ra

lp

edu

ncle

C

e

re

b

ra

lp

edu

ncle

Pontine

gray

Pontine

gray

Dorsal longitudinal fasciculuDorsal longitudinal fasciculuss

Superior cerebellar

peduncle

Medial lemniscus?

C

h

o

r

o

i

d

p

l

e

x

u

s

C

h

o

r

o

i

d

p

l

e

x

u

s

In

fer

ior

ce

reb

ella

rp

ed

unc

le

In

fer

ior

ce

reb

ella

rp

ed

unc

le

Superiorcerebel

lar

pe

du

nc

le

Superiorcerebel

lar

pe

du

nc

le

CEREBELLAR

DEEP NUCLEI

CEREBELLAR

DEEP NUCLEI

Germinal trigoneGerminal trigone

Principal sensory nucleus (VPrincipal sensory nucleus (V))

E

nt

or

h

in

a

l

c

ro

et

x

E

nt

or

h

in

a

l

c

ro

et

x

S

u

b

ic

ulum

S

u

b

ic

ulum

A

m

m

o

n

's

h

or

n

A

m

m

o

n

's

h

or

n

A M Y G D A L A

A M Y G D A L A

HYPOTHALAMUS

(fragmented infundibu lar recess

of the third ve ntricle surrounded

by the arcuate nucleus)

Amygdaloid glioepithelium/ependyma

Pa rahippocampal neuroepithe-

lium, subventricular zone, and

stratified transitional field

TTe mporal stratified transitional fielemporal stratified transitional fieldd

TTe mporal neuroepithelium and subvemporal neuroepithelium and subventricular zoneentricular zone

Pontine

glioepithelium/

ependyma

Pontine

glioepithelium/

ependyma

Germinal and transitional

structures in italics

Germinal and transitional

structures in italics

AlAlvve ar glioepitheliuear glioepitheliumm

Inferior temporal gyrusInferior temporal gyrus

Myelination gliosis

PLATE 238B