The Human Brain During the Third Trimester

Inferi

or cer

ebella

r

pedu

ncle

Spinal^ nucleus

and^ tract^ (V)

Spinal^ nucleus

and^ tract^ (V)

Lat

eral

reti

cular

nuc.

Lat

eral

reti

cular

nuc.

Soli

tary

(^) nu
c.
and
(^) tra
ct
Soli
tary
(^) nu
c.
and
(^) tra
ct
Soli
tar
y (^) nu
c.
and
tra
ct
Soli
tar
y (^) nu
c.
and
tra
ct
Cu
nea
te
nu
cle
us
Cu
nea
te
nu
cle
us
Cu
ne
nuclate
eus
Cu
ne
nuclate
eus
Grac
nu ile
cleus
Grac
nu ile
cleus
MMEDULLAEDULLA
PONSPONS
PONS
MEDULLAMEDULLA
Anterior lobe
HI-H

V

Anterior lobe

HI-H

V

Simplex lo

b

ul

e

HVI

Simplex lo

bu

le

HVI

Simplex

lobule

HVI

Simplex

lobu le

HVI

Simplex

lobule

HVI

Simplex

lobu le

HVI

ChorChoroid plexusoid plexus

ChorChoroid plexusoid plexus

Paramedian lo

bul

e

HVIIB

Para

median lo

bu

le

HVIIB

Paramedian lobule

HVIIB

Paramedian lobule

HVIIB

Paramedian lobule

HVIIB

Paramedian lobule

HVIIB

Paramedian lobule

HVIIB

Paramedian lobule

HVIIB

B

iv

en

tr

al

(^) lo
bu
le
H
V
II
I
B
iv
en
tr
al
(^) lo
bu
le
H
V
II
I
Bi
ventral lo
bul
e
H
VIII
Biventral lo
bu
le
H
VIII
FlocculusFlocculus
FlocculuFlocculuss FlocculuFlocculuss
FlocculuFlocculuss
Inferior
olive
Inferior
oliv e
Inferior
olive
Inferior
oliv e
Reticular
formation
Reticular
fo rmation
Reticular
formation
Reticular
fo rmation
Corticospinal
tract (pyramid)
Middle
cerebellar
peduncle
Middle cerebellar
peduncle
Middle cerebellar
peduncle
Middle cerebellar
peduncle
Middle cerebellar
peduncle
Medial long. fas.
and tectospinal tract
Medial long. fas.
and tectospinal tract
Medial long. fas.
and tectospinal tr.
Medial long. fas.
and tectospinal tr.
Medial lemniscuMedial lemniscuss Medial^ lemnisc
us
Medial^ lemn
iscus
Inferi
or cer
ebella
r
pedu
ncle
Dorsa l
accessory olive
Dorsa l
accessory olive
Dorsal
accessory olive
Dorsal
Hypoglossal (XII)Hypoglossal (XII) accessory olive
Nuc. of RolleNuc. of Rollerr
Dorsal motor nuc. (XDorsal motor nuc. (X))
Nucleus ambiguusNucleus ambiguus
Nuc.
ambiguus
Nuc.
ambiguus
IX nerve root?
Dorsal sensory nuc. (XDorsal sensory nuc. (X))
Raphe nuclear complexRaphe nuclear complex
Latera
l
reticula
r^ nuc.
Latera
l
reticula
r^ nuc.
Fourth ve ntricle/central canal
Central
canal
Central
canal
Commissural nucleus (X)
Dorsal longitudinal fasciculus
Area postrema
Cuneat
efa
scic
ul
us
Cuneat
efa
scic
ul
us
Gracile fasciculuGracile fasciculuss
Gracile fasciculuGracile fasciculuss
Cuneate fasciculuCuneate fasciculuss
Gracile nucleusGracile nucleus

P

y

r

a

m

id

P

y

r

a

m

id

Corticospinal

tract (pyramid)

Spinocephalic tract

Spinocerebellar tracts

Middle

cerebellar

peduncle

X nerve root?

Raphe nuc. complexRaphe nuc. complex

Hypoglossal (XII)Hypoglossal (XII)

Nuc. of RolleNuc. of Rollerr

Dorsal motor nuc. (XDorsal motor nuc. (X))

Dorsal sensory nuc. (XDorsal sensory nuc. (X))

Inferior cerebellar

peduncle

Inferior cerebellar

peduncle

Spinocephalic tract

HEMISPHEREHEMISPHERE

HEMISPHEREHEMISPHERE

HEMISPHEREHEMISPHERE

HEMISPHEREHEMISPHERE

CEREBELLUM

CEREBELLUM

External

germinal

layer

External germinal layer

Ansiform lobule

(Crus II HVIIA)

Ansiform lobule

(Crus II HVIIA)

Ansiform lobule

(Crus II HVIIA)

Ansiform lobule

(Crus II HVIIA)

A

nsif

orm

lo

b

ul

e

(C

rus II

H

V

IIA

)

A

nsif

orm

lo

bu

le

(C

rus II

H

V

IIA

)

Ansiform lobule

(Crus II HVIIA)

Ansiform lobule

(Crus II HVIIA)

PPontine grayontine gray

Germinal and transitional structures in italics

Ansiform lobule

(Crus I HVIIA)

Ansiform lobu le

(Crus I HVIIA)

External germinal layer

External germinal layerExternal germinal layer

Spin

al (^) nu
cleu
s
and
(^) tra
ct (V
)
Spin
al (^) nu
cleu
s
and
(^) tra
ct (V
)
Glioepithelium/ependymaGlioepithelium/ependyma
Glioepithelium/ependymaGlioepithelium/ependyma
Section 1311 Section 1331
PLATE 94B