The Human Brain During the Third Trimester

Moto r

nucleus

(VII)

Moto r

nucleus

(VII)

Ansiform lobule

(Crus I HVIIA)

(damaged)

Ansiform lobu le

(Crus I HVIIA)

(damaged)

Ansiform

lobule

(Crus II HVIIA)

Ansiform

lobu le

(Crus II HVIIA)

Nerve V (myelination gliosis in root)

Nerves VII and VIII?

Fourth

ventricle

Fourth

ventricle

CEREBELLAR

HEMISPHERE

CEREBELLAR

HEMISPHERE

External germinal

layer

Myelination gliosis

(lateral funiculus)

Myelination gliosis

(dorsal funiculus)

Germinal trigone (continuous with the

germinal source of the choroid plexus)

Prepositus

nucleus

Prepositus

nucleus

Raphe nuclear complexRaphe nuclear complex

Medial longitudina

l

fasciculus

Medial longitudina?

l

fasciculus

?

Reticula

r

formationReticula

r

formatio

n Reticula

r

formationReticula

r

formatio

n

Paramedian

lobule?

(HVIIB)

Paramedian

lobu le?

(HVIIB)

Flocculus

(HX)

Flocculus

(HX)

Biventral

lobule

(HVIII)

Biventra l

lobu le

(HVIII)

Tr anspontine corticofugal tract
(thick longitudinal bundles)

Pontocerebellar fiber s

(thin transve rse bundles)

Pontocerebellar fiber s

(decussation)

PONSPONS

MEDULLAMEDULLA

SPINAL CORD

Pontine

gray

Pontine

gray

Dorsal longitudinal

fasciculus

Dorsal longitudinal

fasciculus

Choroid

plexus

Choroid

plexus

Floccular peduncle

Dorsal cochlear nucleus

Cuneate nucleuCuneate nucleuss

Cuneate nucleuCuneate nucleuss

ArArea postrea postrememaa

External cuneate nucleus

External cuneate nucleus

Gracile fasciculuGracile fasciculuss

Sp

ino

cer

ebe

llar

tra

cts

Sp

ino

cer

ebe

llar

tra

cts

Cuneate^ f

asciculus

Cuneate^ f

asciculus

Lateral corticospinal tract

Lissauer's tract

Ve ntral corticospinal tract

Central canal

Ve ntral cochlear nucleus

Vestibular

nuclear

complex

Vestibular

nuclear

complex

Ner

ve (^) V
II
Ner
ve (^) V
II
NeNerve VI?rve VI?
Sp
inal
(^) nu
cleu
s
and
(^) tra
ct (
V)
Sp
inal
(^) nu
cleu
s
and
(^) tra
ct (
V)
Spin
al^ n
ucleu
s
and^
trac
Spina t^ (V)
l^ nu
cleu
s
and^
trac
t (V)
Su
perior ol
iv
e
com
p
le
x
Su
perior oliv
e
com
p
le
x
Trapezoid body an
d
medial lemniscu
s
Trapezoid body an
d
medial lemniscu
s
Middle cerebellar peduncle
Middle
cerebellar
peduncle
Middle
cerebellar
peduncle
Inferior cerebellar peduncle
Inferior cer
ebellar
pedu
ncle
Inferior cer
ebellar
pedu
ncle
R
et
ic
u
la
r
te
gm
en
ta
l
un
lc
eu
s
R
et
ic
u
la
r
te
gm
en
ta
l
un
lc
eu
s
Hypoglossal
nucleus? (XII)
Hypoglossal
nucleus? (XII)
Medullary glio-
epithelium/ependyma
Medullary glio-
epithelium/ependyma
Germinal and transitional
structures in italics
Germinal and transitional
structures in italics
Fourth ve ntricle (lateral recess)
Glioepithelium
(middle cerebellar peduncle)
PLATE 241B