The Human Brain During the Third Trimester

GW37 Sagittal

CR 310 mm

Y180-61

Level 4: Section 781

Middle frontal gyrus?

Superior

frontal gyrus? Angular gyrus?

Precuneus

Cuneus Cuneus

Retro-

splenial

area

Retro-

splenial

area

Basal gangliaBasal ganglia

Occipital

lobe

Occipital

lobe

External

capsule

External

capsule

Optic tractOptic tract

Cerebral peduncle Middle cerebellar peduncle

Inferior cerebellar peduncle

FFornixornix

Orbital gyrus

Substantia innominata

Olfactory bu lb

Parietal

lobe

Parietal

lobe

ThalamusThalamus

Midbrain tegmentum

In

te

rn

al

(^) c
ap
su
le
In
te
rn
al
(^) c
ap
su
le
Trigeminal nerve (V)
Ventral hippocampus
Amygdala
Sple
nium
Sple
nium
Cerebellum
(hemisphere)
Cere bellum
(hemisphere )
FrFrontal lobeontal lobe
Sub-
thalamus
Sub-
thalamus
Co
rpus cal
los
um
Co
rpus cal
los
um
Parieto-
occipital
sulcus
Parieto-
occipital
sulcus
Primary
visual cortex
Cerebellar deep nuclei
Calcarine
fissure
Postcentral gyrus
Superior
parietal lobu le
Precentral gyrus Central sulcus
Paracentral
lobule
Paracentral
lobu le Cingulate
sulcus
Cingulate
Lateral sulcus
ventricle
Lateral
ventricl e
In
ter
na
l
cap
su
le
In
ter
na
l
cap
su
le
Unev en stain
due to variation
in section thickness
1 Rostral migratory stream
2
Fr ontal stratified transitional field (intermingled with the
source of the rostral migratory stream)
3 Fr ontal stratified transitional field
4 Callosal glioepithelium
5 Fo rnical glioepithelium
8 Strionuclear glioepithelium
Remnants of the germinal matrix, migratory streams, and transitional fields
9 External germinal layer (cerebellum)
6 Anterolateral striatal neuroepithelium and subventricular zone
7 Anteromedial striatal neuroepithelium and subventricular zone
10 Subpial granular layer (cortical)
See detail of brain core and
cerebellum in Plates 58A and B.
11
1010
9
22
33 44
(^667744)
88
55
Damaged areas in section
Cortical plate
White matter
Layer I
PLATE 50
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