The Human Brain During the Third Trimester

Nodulus

(X)

Nodulus

(X)

Uvula

(IX)

Uvula

(IX)

Raphe nuclear complexRaphe nuclear complex

Reticular

formation

Reticular

formation

Pyramidal

decussation

Pyramidal

decussation

ChorChoroid plexusoid plexus

FFFFourth ventricleourth ourth ourth vvventricleentricleentricle

Solitary

nuclear

complex

Solitary

nuclear

complex

Medial

vestibular

nucleus

Medial

vestibular

nucleus

Spinal tract (V)

Spinal nucleus (V)

Spinocerebellar tracts

(dorsal and ve ntral)

Ve ntral corticospinal tract?

Nucleus

ambiguus

Nucleus

ambiguus

Cuneate

nucleus

Cuneate

nucleus

Accessory nucleus (XI)

Paraflocculus

(HIX)

Paraflocculus

(HIX)

B

iv

en

tr

al

lo

b

u

le

(H

V

II

I)

B

iv

en

tr

al

lo

b

u

le

(H

V

II

I)

F

lo

cc

ul

a

r

p

ed

u

nc

le

F

lo

cc

ul

a

r

p

ed

u

nc

le

D

en

ta

te

(^) n
u
cl
e
u
s
D
en
ta
te
(^) n
u
cl
e
u
s
Ansiform lobule
Crus I (HVIIA)
Ansiform lobu le
Crus I (HVIIA)
Ansiform lobule
Crus II (HVIIA)
Ansiform lobu le
Crus II (HVIIA)
Fastigial
nucleus
Fa stigial
nucleus
In
ter
po
sit
nucl us
eu
s
In
ter
po
sit
nucl us
eu
s
D
ee
p
N
u
clei
D
ee
p
N
u
clei
External germinal layer
Molecular layer
Granular layer
Medullary layer
MEDULLAMEDULLA
Culmen
(IV, V)
Culmen
(IV, V)
Anterior Lobe (HI-HV)Anterior Lobe (HI-HV)
S
im
p
le
x
lo
b
u
le
(H
V
I
)
S
im
p
le
x
lo
b
u
le
(H
V
I
)
Flocculus
(HX)
Flocculus
(HX)
Paramedian lobule
(HVIIB)
Paramedian lobule
(HVIIB)
Primary fissure
HemispheHemispherree
Vermis
CEREBELLUMCEREBELLUM
Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics
Germinal trigoneGerminal trigone
Germinal trigoneGerminal trigone
Stem cells of
choroid plexus
Medullary
glioepithelium/
ependyma
Medullary
glioepithelium/
ependyma
PParamedian reticular nucleuaramedian reticular nucleuss
Dorsal
longitudinal
fasciculus
Dorsal
longitudinal
fasciculus
Medial longitudinal
fasciculus and tecto-
spinal tract
Medial longitudinal
fasciculus and tecto-
spinal tract
Centralis
(III)
Centralis
(III)
PLATE 44B