The Human Brain During the Third Trimester

GW37 Sagittal

CR 310 mm

Y180-61

Level 2: Section 941

Superior

rostral gyrus?

Postcentral gyrus

Precuneus

Cingulate sulcus

Precentral sulcus?

Cingulate sulcus

(marginal part)

Precentral gyrus

Fourth ve ntricle

Central sulcus

Superior

frontal gyrus

GenuGenu

Spleniu

m

Spleniu

m

FFornixornix

Gyrus rectus

Orbital gyrus?

Cingulate gyru

s

Cingulate gyru

s

P

arieta

l

lobe

Parietal

lobe

Corpus

callosum

Corpus

callosum

ThalamusThalamus

M

id

br

ai

n

M

id

br

ai

n

Te

ctu

m

Te

ctu

T m

egm

en

tum

Te

gm

en

tum

MedullaMedulla

Paraflocculus

Cerebellum

(vermis)

Cerebellum

(vermis)

PPonsons

Lat

era

l

ven

tric

le

FrFrontal lobeontal lobe

Paracentral

lobule

Paracentral

lobu le

Cerebral peduncle

Corticofugal tract

Oculomotor nerve (III)

SeptumSeptum

Preoptic area

Hypo-

thalamus

Hypo-

thalamus

Subcallosal

area

Subcallosal

area

Optic nerve (II) and chiasm

See high magnification views of the

cerebellum in Plates 63 and 64.

See detail of brain core and

cerebellum in Plates 56A and B.

3 Mesencephalic glioepithelium/ependyma

11

8

22

33

44

66

7

1 Callosal sling

2 Strionuclear glioepithelium

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

7 External germinal layer (cerebellum)

4 Pontine glioepithelium/ependyma

5 Medullary glioepithelium/ependyma

6 Germinal trigone

8 Subpial granular layer (cortical)

55

Damaged areas in section

Cingulate sulcuCingulate sulcuss

Cortical plate

White matter

Layer I

PLATE 48