The Human Brain During the Third Trimester

Inferior cerebellar peduncle

and spinocerebellar tracts

External cuneate nucleus

Spinocephalic tract?

External germinal layer

External germinal layer

Stem cells of choroid plexus

Germinal trigoneGerminal trigone

Germinal trigoneGerminal trigone

Molecular layer

Purkinje cell layer

Granule cell layer

Medullary layer

Pyra

mid

(cortic

ospin

al

tract)

Pyra

mid

(cortic

ospin

al

tract)

Medial

longitudinal

fasciculus and

tectospinal

tract

Medial

longitudinal

fasciculus and

tectospinal

tract

Cuneate

nucleus

Cuneate

nucleus

So

lit

ar

y

nu

cl

eu

s (^) a
nd
tr
ac
t
So
lit
ar
y
nu
cl
eu
s (^) a
nd
tr
ac
t
Reticular
formation
Reticular
formation
Lateral
reticular
nucleus
Lateral
reticular
nucleus
Hypoglossal
nucleus (XII)
Hypoglossal
nucleus (XII)
Nucleus of RollerNucleus of Roller
Medial
accessory olive
Medial
accessory olive
Inferior
olive complex
(principal
nucleus)
Inferior
olive complex
(principal
nucleus)
Middle and inferior
cerebellar peduncles
Middle and inferior
cerebellar peduncles
M
ed
ia
l
le
m
n
is
cu
s
M
ed
ia
l
le
m
n
is
cu
s
Spinal
nucleus
and tract
(V)
Spinal
nucleus
and tract
(V)
Fourth
Flocculus ventricl e
(HX)
Flocculus
(HX)
MEDULLAMEDULLA
MEDULLAMEDULLA
Lingula
(I, II)
Lingula
(I, II)
Nodulus
(X)
Nodulus
(X)
Centralis
(III)
Centralis
(III)
Culmen
(IV, V)
Culmen
(IV, V)
Medial
vestibular
nucleus
Medial
vestibular
nucleus
Superior
cerebellar
peduncle
Superior
cerebellar
peduncle
R
a
p
h
e
n
u
c
le
a
r
c
o
m
p
le
x
R
a
p
h
e
n
u
c
le
a
r
c
o
m
p
le
x
Vestibular
nuclear
complex
Ve stibular
nuclear
complex
Inferior
cerebellar
peduncle
Inferior
cerebellar
peduncle
Simplex
lobule
(HVI)
Simplex
lobu le
(HVI)
Paramedian
lobule
(HVIIB)
Paramedian
lobu le
(HVIIB)
Biventral
lobule
(HVIII)
Biventra l
lobu le
(HVIII)
Dorsal
longitudinal
fasciculus
Dorsal
longitudinal
fasciculus
Choroid
plexus
Choroid
plexus
Choroid
plexus
Choroid
plexus
CE
R
E
B
E
L
L A R D E E P N U C L E I
CE
R
E
B
E
L
L A R D E E P N U C L E I
Dentate
nucleus
Dentate
nucleus
Interpositus
nucleus
Interpositus
nucleus
Fastigial
nucleus
Fa stigial
nucleus
Middle
cerebellar
peduncle
Middle
cerebellar
peduncle
Dorsal
moto r
nucleus (X)
Dorsal
moto r
nucleus (X)
Dorsal
sensory
nucleus (X)
Dorsal
sensory
nucleus (X)
ANTERIOR LOBE
(HI-HV)
ANTERIOR LOBE
(HI-HV)
Part of
section
torn away
Fourth ventricle
(lateral recess)
Fourth ventricle
(lateral recess)
Ansiform lobule
Crus II
(HVIIA)
Ansiform lobu le
Crus II
(HVIIA)
Ansiform lobule
Crus I
(HVIIA)
Ansiform lobu le
Crus I
(HVIIA)
VERMIS
HEMISPHEREHEMISPHERE
CEREBELLUMCEREBELLUM
Germinal and transitional structures in italics
Medullary glioepithelium/ependymaMedullary glioepithelium/ependyma
PLATE 188B