The Human Brain During the Third Trimester

Medullary glioepithelium/ependymaMedullary glioepithelium/ependyma

F

ourth

v

entricl

e

F

ourth

ventricl

e

Nerve IX (root)

Nerve VII (?)

Nerve VIII (root)

Solitary nucleuSolitary nucleuss

Hypoglossal

nucleus (XII)?

Hypoglossal

nucleus (XII)?

Inferior

olive

complex

Inferior

olive

complex

Inferior

olive

(capsule)

Inferior

olive

(capsule)

Medial longitudinal

fasciculus and

tectospinal tract

Medial longitudinal

fasciculus and

tectospinal tract

Dorsal longi-

tudinal fasciculus

Dorsal longi-

tudinal fasciculus

Reticular Reticular ffo rmationormation

Reticular Reticular ffo rmationormation

Pontocerebellar fibers

Pyramis

(VIII)

Pyramis

(VIII)

Nodulus

(X)

Nodulus

(X)

Uvula

(IX)

Uvula

(IX)

Raphe nuclear compleRaphe nuclear complexx

Spinal nucleus

and tract (V)

Spinal nucleus

and tract (V)

Crus I,

ansiform lobule

(HVIIA)

Crus I,

ansiform lobu le

(HVIIA)

Crus II,

ansiform lobule

(HVIIA)

Crus II,

ansiform lobu le

(HVIIA)

Crus II,

ansiform lobule

(HVIIA)

Crus II,

ansiform lobu le

(HVIIA)

P

ar

am

ed

ia

n lo

bu

le

(

H

V

II

B

)^

an

d^

bi

ve

nt

ra

l lo

bu

le

(H

V

II

I)

P

ar

am

ed

ia

n lo

bu

le

(

H

V

II

B

)^

a

nd

biv

en

tr

al lo

bu

le

(H

V

II

I)

Vestibular

nuclear

complex

Vestibular

nuclear

complex

Choroid

plexus

Choroid

plexus

Choroid

plexus

Choroid

plexus

Choroid

plexus

Choroid

plexus

Flocculus

(HX)

Flocculus

(HX)

Flocculus

(HX)

Flocculus

(HX)

M

ed

ia

l

le

m

ni

sc

us

M

ed

ia

l

le

m

ni

sc

us

Paramedian lo

bule (HVIIB) and

bi

ventral lo

bule (HVIII)

Paramedian lo

bule (HVIIB) and

biventral lo

bule (HVIII)

Do

rs

alc

och

learnu

cl

eu

s

Do

rs

alc

och

learnu

cl

eu

s

Ventralcochlea

rnu

cleu

s

Ventralcochlea

rnu

cleu

s

M

id

d

le

c

e

re

b

el

la

rpe

dunc

le

M

id

d

le

c

e

re

b

el

la

rpe

dunc

le

In

fe

ri

or

ce

re

b

el

la

r

pedu

nc

le

In

fe

ri

or

ce

re

b

el

la

r

pedu

nc

le

In

fe

ri

o

r

ce

re

b

ell

ar

ped

uncle

In

fe

ri

o

r

ce

re

b

ell

ar

ped

uncle

Cru

s (^) I,
(^) ans
ifor
m (^) lo
bule
(HV
IIA
)
Cru
s (^) I,
(^) ans
ifor
m (^) lo
bule
(HV
IIA
)
Paraflocculus
(HIX)
Paraflocculus
(HIX)
Paraflocculus
(HIX)
Paraflocculus
(HIX)
Spinal nucleus
and tract (V)
Spinal nucleus
and tract (V)
Mediall
em
nis
cu
s
Mediall
em
nis
cu
s
MEDULLAMEDULLA
PrPrepositus nucleuepositus nucleuss
Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics
Transpontine corticofugal tract
CEREBELLUMCEREBELLUM
VVermisermis
HemispheHemispherree
Pontine gray
External germinal layer
External germinal layer
P O N SP O N S
PLATE 148B