The Human Brain During the Third Trimester

Dorsal

hippocampus

GW37 Sagittal

CR 310 mm

Y180-61

Level 5: Section 721

Middle frontal gyrus

Angular gyrus

Supramarginal

gyrus

Retro-

splenial

area

Retro-

splenial

area

B

a

sa

l^ g

an

gl

ia

B

a

sa

l^ g

an

gl

ia

Occipital

lobe

Occipital

lobe

External

capsule

External

capsule

Optic tractOptic tract

Cerebral peduncle

FFornixornix

Orbital

gyrus

Substantia

innominata

Substantia

innominata

Parietal

lobe

Parietal

lobe

ThalamusThalamus

Midbrain tegmentum

Ventral hippocampus

Amygdala Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

FrFrontal lobeontal lobe

Sub-

thalamus

Sub-

thalamus

Parieto-

occipital

sulcus

Parieto-

occipital

sulcus

Calcarine

fissure

Postcentral gyrus

Superior

parietal lobu le

Central sulcus

Precentral gyrus

Paracentral

lobule

Paracentral

lobu le

Lateral

ventricle

Lateral

Internal ventricle

capsule

Internal

capsule

Primary olfactory

cortex (Piriform)

Primary olfactory

cortex (Piriform)

1 Callosal glioepithelium

2 Fo rnical glioepithelium

3 Alve ar glioepithelium

4 Subgranular zone (dentate)

5 Lateral migratory stream (cortical)

9 Strionuclear glioepithelium

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

10 External germinal layer (cerebellum)

6 Amygdaloid glioepithelium/ependyma

7 Anterolateral striatal neuroepithelium and subventricular zone

8 Po sterior striatal neuroepithelium and subventricular zone

11 Subpial granular layer (cortical)

See detail of brain core and

cerebellum in Plates 59A and B.

Cor

pus c

allos

um

Cor

pus c

allos

um

Damaged areas in section

11

11

11

10

99

22

33

44

66

(^7788)
55
SSpplleenniiuumm
CCuunneeuuss
Cortical plate
White matter
Layer I
PLATE 51