The Human Brain During the Third Trimester

S

p

in

a

l

n

u

cl

e

u

s

(V

)

Culmen

(IV, V)

Culmen

(IV, V)

Raphe nuclear complexRaphe nuclear complex

M

e

d

ia

l^

le

m

n

is

c

u

s

M

e

d

ia

l^

le

m

n

is

c

u

s

Medial longitudinal

fasciculus and tecto-

spinal tract

Medial longitudinal

fasciculus and tecto-

spinal tract

Superior

cer

ebellar peduncl

e

Superior

cer

ebellar peduncl

e

Inferior

cerebellar

peduncle

Inferior

cerebellar

peduncle

Inferior

olive

Inferior

olive

Inferior

olive

Inferior

oliv e

A

n

te

ri

o

r^

L

o

b

e^

(H

I-

H

V

)

A

n

te

ri

o

r^

L

o

b

e^

(H

I-

H

V

)

Lateral

reticular

nucleus

Lateral

reticular

nucleus

ChorChoroid plexusoid plexus

Cochlear nucleus

(ventral)

Cochlear nucleus

(ventral)

S
im

p

le

x

lo

bu

le

(H

V

I)

S
im

p

le

x

lo

bu

le

(H

V

I)

Flocculus

(HX)

Flocculus

(HX)

Middle

cerebellar

peduncle

Middle

cerebellar

peduncle

Centralis

(III)

Centralis

(III)

Fourth ventricle

Lingula

(I, II)

Lingula

(I, II)

Dorsal sensory

nucleus (X)

Dorsal sensory

nucleus (X)

Solitary

nuclear

complex

Solitary

nuclear

complex Solitary

tract

Solitary

tract

Hypoglossal

nucleus (XII)

Hypoglossal

nucleus (XII)

Superior

vestibular

nucleus

Superior

vestibular

nucleus Medial

vestibular

nucleus

Medial

vestibular

nucleus

Inferior

vestibular

nucleus

Inferior

vestibular

nucleus

S

p

in

a

l

n

u

cl

e

u

s

(V

)

Spinal tract (VSpinal tract (V))

Do

rs

al

ac

ce

sso

ry

oli

va

ry

(^) n
uc
leu
s
Do
rs
al
ac
ce
sso
ry
oli
va
ry
(^) n
uc
leu
s
Retrofacial
nucleus?
Retrofacial
nucleus?
Reticular
formation
Reticular
formation
Prepositus
nucleus
Prepositus
nucleus
PParamedian reticular nucleuaramedian reticular nucleuss
Nucleus of RollerNucleus of Roller
Corticospinal
(pyramidal) tract
Corticospinal
(pyramidal) tract
Molecular layer
Granular layer
Medullary layer
Inferior cerebellar peduncle
and spinocerebellar tracts
Fourth ventricle
(lateral recess)
Fourth ventricle
(lateral recess)
Floccular peduncleFloccular peduncle
MEDULLAMEDULLA
Pa
ra
m
ed
ian
lo
bu
le?

(H

VI

IB

)

Pa

ra

m

ed

ian

lo

bu

le?

(H

VI

IB

)

Primary fissure

HemispheHemispherree

Vermis

CEREBELLUMCEREBELLUM

External germinal layer

Germinal trigone

Stem cells of choroid plexus

Pontine

glioepithelium/

ependyma

Dorsal

longitudinal

fasciculus

PONSPONS

Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics

PLATE 43B