The Human Brain During the Third Trimester

GW26 Sagittal

CR 225 mm

Y147-63

Level 4: Section 421

Pontine gray

Motor nucleus (VII)

Olfactory tubercle

Transpontine corticofugal tract

Primary Primary ffissuissurree

Lateral funiculus

Medial lemniscus

Lateral

lemniscus

Stria medullaris

Parieto-

occipital

sulcus

Marginal

sulcus

Induseum

griseum

Cerebral peduncle

Inferior olive complex

Vestibular nuclear complex

Lateral reticular nucleus

ThalamusThalamus

Cuneate fasciculus and nucleus

Spinal nucleus and tract (V)

Para-

flocculus

(HIX)

Para -

flocculus

(HIX)

Orbital gyrusOrbital gyrus

Parietal

lobe

Parietal

lobe

Frontal

lobe

Frontal

lobe

Paracentral

lobule

Paracentral

lobu le

Frontal

lobe

Frontal

lobe

Hypo-

thalamus

Hypo-

thalamus

GenuGenu

Sp

le

ni

um

Sp

le

ni

um

Nu

cleu

s

acc

um

ben

s

Nu

cleu

s

acc

um

ben

s

TTectuectumm

MidbraiMidbrainn

PPonsons

MedullaMedulla

Spinal cordSpinal cord

Occipital

lobe

Occipital

lobe

Cortical plate

White matter

Lateral

ventricle

Cere bellum

(hemisphere )

Anterior

lobe

Anterior

lobe

Dentate

nucleus

Dentate

nucleus

Simplex

lobule

Simplex

lobu le

Ansiform

lobule

(crus II)

Ansifo rm

lobu le

(crus II)

Biventral lobule (HVIII)

Paramedian lobule (HVIIB)

Ansiform

lobule

(crus I)

Ansiform

lobu le

(crus I)

TTe gmentumegmentum

Inferior

colliculus

Inferior

colliculus

Superior

colliculus

Superior

colliculus

(^2211)
33
44
44
55
66
6
Accumbent neuroepithelium and subventricular zone
(intermingled with the rostral migratory stream)
7 Strionuclear neuroepithelium and subventricular zone
2 Fr ontal neuroepithelium and subventricular zone
Co
rpu
sca
llosum
Co
rpu
sca
llosum
Hippocampal commissuHippocampal commissurree
FFa sciola cineasciola cinerre umeum
Cingulate gyrusCingulate gyrus
Cingulate
gyrus
(retrosplenial
area)
Cingulate
gyrus
(retrosplenial
area)
SubthalamusSubthalamus
Entorhinal
cortex
Entorhinal
cortex
CingulumCingulum
DORSAL
COMPLEX
DORSAL
COMPLEX
CENTRAL
COMPLEX
CENTRAL
COMPLEX
PO
ST
E
RI
O
R
CO
M
P
LE
X
PO
ST
E
RI
O
R
CO
M
P
LE
X
AN
TE
RI
OR
CO
M
PL
EX
AN
TE
RI
OR
CO
M
PL
EX
Cingulate sulcuCingulate sulcuss
Fourth
ventricle
Fourth
ventricle
Calcarine Calcarine ffissuissurre e
Primary
visual
cortex
Primary
visual
cortex
Forn
ix
Forn
ix
Remnants of the germinal matrix, migratory streams, and transitional fields
9 External germinal layer (cerebellum)
8 Pontine glioepithelium/ependyma
1 Rostral migratory stream
4 Callosal glioepithelium
5 Fo rnical glioepithelium 10 Subpial granular layer (cortical)
Layer I
3 Fr ontal stratified transitional field
B
de
o.cun
sf
rt
ia
te
rm
.
B
de
o.cun
sf
rt
ia
te
rm
77.
10
10
9
9
88
1010
Damaged areas in section
HHiippppooccaammppuuss
See detail of brain core and
cerebellum in Plates 203A and B.
PLATE 193