The Human Brain During the Third Trimester

7 8

Ve

rm

is

Ve

rm

is

H

emi

sphere

H

emi

sphere

Ce

re

be

llu

m

Ce

re

be

llu

m

Cingulate gyrus

(retrosplenial area)

Lateral

lemniscus

Superior frontal gyrus

Superior

parietal lobu le

CuneusCuneus

Precentral gyrus

Postcentral gyrus

Central sulcus

Parieto-

occipital

sulcus

Cingulate

sulcus

Cingulate

sulcus

Orbital gyri

Optic tract

Ve ntral hippocampus

Cerebral peduncle

Middle cerebellar peduncle

Inferior cerebellar peduncle Fourth ve ntricle (lateral recess)

Superior cerebellar peduncle

Inferior olive

Pontine gray

Anterior

commissure

Anterior

commissure

InterInternal capsulnal capsulee

Primary visual

cortex

Lateral ventricle

SubthalamusSubthalamus

FFornixornix

Occipital

lobe

Occipital

MidbraiMidbrainn lobe

ThalamusThalamus

Basal

ganglia

Basal

ganglia

PPonsons

Medu

lla

Medu

lla

Parietal

lobe

Parietal

lobe

Paracentral

lobule

Paracentral

lobu le

Hypo-

thalamus

Hypo-

thalamus

Frontal

lobe

Frontal

lobe

GW32 Sagittal

CR 270 mm

Y15-60

Level 3: Section 681

See detail of brain core and

cerebellum in Plates 104A and B.

2

Accumbent neuroepithelium and subventricular zone

(intermingled with the source of the rostral migratory stream)

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

9 External germinal layer (cerebellum)

7

Anteromedial striatal neuroepithelium and

subventricular zone

10 Subpial granular layer (cortical)

1 Rostral migratory stream 6 Fo rnical glioepithelium

8 Strionuclear glioepithelium

4

Fr ontal neuroepithelium, subventricular zone, and

stratified transitional field

5 Callosal glioepithelium

3 Rostral migratory stream (source area)

Hippocampal

commissure

Hippocampal

commissure

Pr

ec

un

eu

s

Pr

ec

un

eu

s

SSpplleenniiuumm

TTectuectumm

TTe gmentumegmentum

Cingul Corpus callosuCorpus callosumm

um

Cing

ulum

Cin

gulate g

yr

us

Cin

gulate g

yr

us

33

55

55

66

11

22

44

99

99

1010

1010

Damaged areas in section

Cortical plate

White matter

Layer I

PLATE 98