The Human Brain During the Third Trimester

Optic tract

GW37 Sagittal

CR 310 mm

Y180-61

Level 6: Section 661

Middle

frontal gyrus

Lateral

fissure

Inferior frontal gyrus

Occipital

lobe

Occipital

lobe

Fusiform gyrus?

Parahippocampal

gyrus

Orbital gyri

Primary olfactory cortex (Piriform)

Entorhinal cortex (in parahippocampal gyrus)

Insular

gyrus

Substantia

innominata

Substantia

innominata

Parietal

lobe

Parietal

lobe

ThalamusThalamus

Ventral hippocampus

Amygdala

Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

FrFrontal lobeontal lobe

C

or

puscallosum

C

or

puscallosum

Parieto-

occipital

sulcus

Occipital

gyri

Postcentral gyrus

Superior parietal lobu le

Precentral gyrus Central sulcus

Paracentral

lobule

Paracentral

lobu le

Lateral

ventricle

Lateral

ventricle

Ex

te

rn

al

ca

ps

ul

e

Ex

te

rn

al

ca

ps

ul

e

C

la

us

tr

um

C

la

us

tr

um

Int

ern

al

ca

sp

u

le

Int

ern

al

ca

sp

u

le

B

as

al

ga

ng

lia

B

as

al

ga

ng

lia

See detail of brain core and

cerebellum in Plates 60A and B.

1 Callosal glioepithelium

2 Fo rnical glioepithelium

3 Alve ar glioepithelium

4 Subgranular zone (dentate)

5 Lateral migratory stream (cortical)

8 Strionuclear glioepithelium

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

9 External germinal layer (cerebellum)

6 Amygdaloid glioepithelium/ependyma

7 Po sterior striatal neuroepithelium and subventricular zone

10 Subpial granular layer (cortical)

Damaged areas in section

Angular gyrus

Supramarginal

gyrus

FFornixornix

11

1010

9

22

33

44

66

77

88

55

Dorsal

hippocampus

Dorsal

hippocampus

Calcarine

fissure

CCuunneeuuss

Cortical plate

White matter

Layer I

PLATE 52