The Human Brain During the Third Trimester

GW37 Sagittal

CR 310 mm

Y180-61

Lev el 1: Section 961

Superior

rostral gyrus?

Postcentral gyrus

Precuneus

Cingulate sulcuCingulate sulcuss

Cingulate sulcus

Cingulate sulcus

(marginal part)

Precentral gyrus

Fourth ve ntricle

Cerebral aqueduct

Central sulcus

Superior

frontal gyrus

GenuGenu

Spleniu

m

Spleniu

m

FFornixornix

Subcallosal area

Inferior

rostral gyrus?

Cingulate gyru

s

Cingulate gyru

s

P

arieta

l

lobe

Parietal

lobe

Corp

us ca

llosum

Corp

us ca

llosum

ThalamusThalamus

M

id

br

a

in

M

id

br

a

in

Te

ctu

m

Te

ctu

m

Te

gm

ent

um

Te

gm

ent

um

MedullaMedulla

Paraflocculus

(from right side

of brain)

Cerebellum

(vermis)

Cere bellum

(vermis)

PPonsons

La

ter

al

ven

tri

Latecle

ra

l

ven

tri

cle

FrFrontal lobeontal lobe

Paracentral

lobule

Paracentral

lobu le

Cerebral peduncle

Optic nerve (II) and chiasm

Corticofugal tract

Oculomotor nerve (III)

Third vThird ventricleentricle

Se

p

tu

m

Se

p

tu

m

Preoptic area

Hypo-

thalamus

Hypo-

thalamus

4 Mesencephalic glioepithelium/ependyma

11

9

22

3

33

44

55

66

77

8

3 Diencephalic glioepithelium/ependyma

1 Callosal sling

2 Strionuclear glioepithelium

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

8 External germinal layer (cerebellum)

5 Pontine glioepithelium/ependyma

6 Medullary glioepithelium/ependyma

7 Germinal trigone (cerebellum)

9 Subpial granular layer (cortical)

See detail of brain core and

cer ebellum in Plates 55A and B.

Damaged areas in section

Cortical plate

White matter

Layer I

PLATE 47