The Human Brain During the Third Trimester

Fourth

ventricle

An

te

ri

or

lo

be

(H

I-H

V

)

An

te

ri

or

lo

be

(H

I-H

V

)

Uvula

(IX)

Uvula

(IX)

Amygdaloid

glioepithelium/ependyma?

Rostral migratory streaRostral migratory streamm

Subpial granular layerSubpial granular layer

Medullary glioepithelium/ependyma

Primary

fissure

Nodulus

(X)

Nodulus

(X)

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?

Medial lemniscus?

Middle cerebellar peduncle

Layer I

Entorhinal

cortical

plate

Layer III

Layers V- VI

Layer IV (lamina dessicans)

Layer II (stellate cell islands)

Fourth

ventricl e

Fourth ventricle

(lateral recess)

Fourth ventricle

(lateral recess)

CEREBELLAR CEREBELLAR VERMISVERMIS

CEREBELLAR

HEMISPHERE

CEREBELLAR

HEMISPHERE

Parahippocampal

gyrus

Parahippocampal

gyrus

External

germinal

layer

Prepositus

nucleus

Prepositus

nucleus

Raphe nuclear

complex

Raphe nuclear

complex

Medial

longitudinal

fasciculus

Medial

longitudinal

fasciculus

Reticula

r

formationReticula

r

formatio

n

Paramedian

lobule?

(HVIIB)

Paramedian

lobu le?

(HVIIB)

Paraflocculus

(HIX)

Paraflocculus

(HIX)

Tr anspontine corticofugal tract

(thick longitudinal bundles)

Pontocerebellar fibers (thin transve rse bundles)

Pontocere-

bellar fiber s

(decussation)

PONSPONS MEDULLAMEDULLA

Pontine

gray

Pontine

gray

Dorsal longitudinal

fasciculus

Dorsal longitudinal

fasciculus

Spinal nuc-

leus (V)

Spinal nuc-

leus (V)

Spinal

tract(V)

Spinal

tract(V)

E

n

to

rh

in

a

l

c

ro

et

x

E

n

to

rh

in

a

l

c

ro

et

x

Dentate nucleusDentate nucleus

Choroid

plexus

Choroid

plexus

Choroid

plexus

Choroid

plexus

Lateral Lateral vestibvestibular nucleusular nucleus??

Floccular pedunclFloccular pedunclee

Dorsal cochlear

nucleus

Dorsal cochlear

nucleus

Vestibular

nuclear

complex

Vestibular

nuclear

complex

Inferior cer

ebella

r

peduncle

Inferior cer

ebella

r

peduncle

M

id

dle

ce

re

be

lla

r

pe

du

nc

le

M

id

dle

ce

re

be

lla

r

pe

du

nc

le

NeNerve VII?rve VII?

Moto r

nucleus

(V)

Moto r

nucleus

(V)

E

nto

rhin

al

co

rt

e

x

Optic nerve

HYPOTHALAMUS

(infundibu lar recess of the third ve ntricle

surrounded by the arcuate nucleus)

Entorhinal stratified transitional field

Entorhinal stratified transitional field

Te mporal neuroepithelium, subventricular zone,

and stratified transitional field?

R

te

ic

u

la

r

te

gm

en

ta

l

nu

cl

eu

s

R

te

ic

u

la

r

te

gm

en

ta

l

nu

cl

eu

s

Principal sensory

nucleus? (V)

Principal sensory

nucleus? (V)

Olfactory peduncle

Germinal trigone

(continuous with the

germinal source of the

choroid plexus)

Nucleus of the

lateral lemniscus?

(ventral)

Damaged area

Germinal and transitional

structures in italics

Germinal and transitional

structures in italics

Inferior temporal gyrusInferior temporal gyrus

PLATE 239B