The Human Brain During the Third Trimester

GW26 Horizontal

CR 235 mm

Y16-59

Level 9: Section 700

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Frontal

lobe

Frontal

lobe

Cerebellum

(vermis)

Cerebellum

(vermis)

Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

Cortical plate

Gyrus rectus

Orbital gyrus

Lateral

ventricle

Lateral

ventricle

Primary olfactory cortex (piriform)

Olfactory tubercle

Cerebral

aqueduct

Cere bral

aqueduct

Lateral fissure

Middle and inferior temporal gyri

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White matter
11
22
66
77
88
99
1010
1111
12
13
13
14
55
33
44
Interhemispheric fissure
Parahip-
pocampal
gyrus
Parahip-
pocampal
gyrus
Hippo-
campus
Hippo-
campus
Lateral
lemniscus
Cerebellum
(deep nuclei)
Cere bellum
(deep nuclei)
HypothalamusHypothalamus
Optic
tract
Optic
tract
AmygdalAmygdalaa
AmygdalAmygdalaa
Cerebral
peduncle
Cere bral
peduncle
Substantia
nigra
Substantia
nigra
Remnants of the germinal matrix, migratory streams, and transitional fields
2 Fr ontal neuroepithelium and subventricular zone
1 Rostral migratory stream
Pa rahippocampal neuroepithelium, subventricular
zone, and stratified transitional field
4
3 Fr ontal stratified transitional field 10 Amygdaloid glioepithelium/ependyma
11 Diencephalic (hypothalamic) glioepithelium/ependyma
12 Mesencephalic glioepithelium/ependyma
13 External germinal layer (cerebellar)
7 Alve ar glioepithelium
8 Subgranular zone (dentate)
9 Lateral migratory stream (cortical)
14 Subpial granular layer (cortical)
5 Te mporal neuroepithelium and subventricular zone
6 Te mporal stratified transitional field
Layer I
TTectuectumm
TTe gmentumegmentum
MidbrainMidbrain
See detail of brain core and
cerebellum in Plates 236A and B.
PLATE 224