The Human Brain During the Third Trimester

LLiinngguullaa

Lateral Lateral ffissu reissure

ClaustrumClaustrum

ExterExternal capsulnal capsulee

GW37 Sagittal

CR 310 mm

Y180-61

Level 7: Section 621

Middle frontal gyrus

Inferior frontal gyrus

Occipital

lobe

Occipital

lobe

Fusiform gyrus?

Parahippocampal

gyrus

Orbital

gyri

Primary olfactory cortex (Piriform)

Insular

gyrus

Insular

gyrus

Parietal

lobe

Parietal

lobe

ThalamusThalamus

Ventral

hippocampus

Ventral

hippocampus

Dorsal

hippo-

campus

Dorsal

hippo-

campus

AAmmyyggddaallaa

Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

FrFrontal lobeontal lobe

Parieto-

occipital

sulcus

Supramarginal

gyrus

Occipital

gyri

Postcentral gyrus

Postcentral sulcus

Angular gyrus

Precentral gyrus Central sulcus

Precentral sulcus

Paracentral

lobule

Paracentral

lobu le

Lateral

ventricle

Lateral

ventricle

Lateral

ventricle

Lateral

ventricle

In

te

rn

al

ca

ps

ule

In

te

rn

al

ca

ps

ule

Corpus

callosum

Corpus

callosum

Entorh

inal

cor

tex

Entorh

inal

cor

tex

1 Callosal glioepithelium

2 Fo rnical glioepithelium

4 Alve ar glioepithelium

5 Subgranular zone (dentate)

3

Pa rahippocampal neuroepithelium, subventricular zone,

and stratified transitional field

6 Lateral migratory stream (cortical)

9 Strionuclear glioepithelium

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

10 External germinal layer (cerebellum)

7 Amygdaloid glioepithelium/ependyma

8 Po sterior striatal neuroepithelium and subventricular zone

11 Subpial granular layer (cortical)

See detail of brain core and

cerebellum in Plates 61A and B.

Damaged areas in section

Substantia

innominata

Substantia

innominata

FFornixornix

Calcarine fissure

CCuunneeuuss

11

99

10

1111

22

33

44

66

77

88

55

Basal gangliaBasal ganglia

Cortical plate

White matter

Layer I

PLATE 53