The Human Brain During the Third Trimester

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Occipital
lobe

Occipital
lobe

Parietal
lobe

Parieta l
lobe

Paracentral
lobule

Paracentral
lobu le

ThalamusThalamus


Basal
ganglia

Basal
ganglia

Cerebellum
(Hemisphere)

Cere bellum
(Hemisphere )

Dorsal
hippocampus

Dorsal
hippocampus

Ventral
hippocampus

Ve ntral
hippocampus

FFornixornix

Precentral gyrus

Precentral
sulcus

Middle fr

ontal gyrus
Middle fr

ontal gyrus

Postcentral gyrus
Postcentral sulcus
Superior parietal
lobu le

Angular
gyrus?

Supramarginal
gyrus?

Supramarginal
gyrus?

Central sulcus

Parieto-
occipital
sulcus

Parieto-
occipital
sulcus

Orbital
gyri

Primary olfactory cortex (piriform)

Entorhinal cortex

Amygdala

Anterior
commissure

Anterior
commissure

Frontal
lobe

Frontal
lobe

Calcarine fissure

Cerebellar deep nuclei

Middle and inferior
cerebellar peduncles

Parahippocampal gyrus

Internal
capsule

Internal
capsule

GW32 Sagittal


CR 270 mm


Y15-60


Level 4: Section 581


See detail of brain core and


cerebellum in Plates 105A and B.


8 Amygdaloid glioepithelium/ependyma


9


Anterolateral striatal neuroepithelium and subventricular zone
(intermingled with the source of the rostral migratory stream)

Remnants of the germinal matrix, migratory streams, and transitional fields


12 External germinal layer (cerebellum)


10 Anteromedial striatal neuroepithelium and subventricular zone


13 Subpial granular layer (cortical)


1


Fr ontal neuroepithelium, subventricular zone, and
stratified transitional field

5 Fo rnical glioepithelium


6 Alve ar glioepithelium


7 Subgranular zone (dentate)


11 Strionuclear glioepithelium


3


Pa rahippocampal neuroepithelium, subventricular zone,
and stratified transitional field

4 Callosal glioepithelium


2


Pa racentral neuroepithelium, subventricular zone, and
stratified transitional field

Damaged areas in section

Choroid
plexus

Choro id
plexus

Lateral ventricle

Corpus
callosum

Corpus
callosum

CuneusCuneus

Lingula?Lingula?

SubthalamuSubthalamuss

Primary visual
cortex

Cortical plate

White matter

Layer I

7
88

1111


12


12


13
13

33


55


66


11


11


22


44


99


99


1010


PLATE 99

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