The Human Brain During the Third Trimester

GW32 Sagittal

CR 270 mm

Y15-60

Level 1: Section 801

Superior

frontal gyrus

Superior frontal gyrus

Precentral gyrus

Postcentral gyrus

Postcentral sulcus

Precuneus

Primary visual

cortex

Calcarine

*Interhemispheric ffissure

issure

Central sulcus

CoCorpus callosurpus callosumm

Cave of

the septum

Hippocampal commissure

Fo rnix

Choroid

plexus

Pineal gland

Sub- Posterior commissure

callosal

area

Gyrus rectus

Anterior

commissure

Optic chiasm

Mammillary body

Cerebral peduncle

Pontine gray

Pyramid (corticospinal tract)

Pyramidal decussation

Medial lemniscus

(decussation)

Gracile nucleus

Gracile fasciculus

Third ventricle

TTectuectumm Lin

gu

la

?

Li

ng

ul

a?

Cu

ne

us

Cu

ne

us

TTe gmentumegmentum

Fourth ve ntricle

GenuGenu

High magnification views

of the cerebellar cortex

are in Plates 108-111.

Occipital

lobe

Occipital

lobe

MidbraiMidbrainn

PPonsons

M

e

d

u

lla

M

e

d

u

lla

Cerebellum

(vermis)

Cere bellum

(vermis)

Parietal

lobe

Parietal

lobe

Paracentral

lobule

Paracentral

lobu le

Hy

po

tha

lam

us

Hy

po

tha

lam

us

SeptumSeptum

Frontal

lobe

Frontal

lobe

See detail of brain core and

cerebellum in Plates 102A and B.

3 Mesencephalic glioepithelium/ependyma

2 Diencephalic/mesencephalic glioepithelium/ependyma

1 Diencephalic (hypothalamic) glioepithelium/ependyma

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 (cerebellum)

8 Subpial granular layer (cortical)

SpleniumSplenium

11

11

8

8

22

3

44

55

66

7

Damaged areas in section

Superior

rostral gyrus?

Inferior

rostral

gyrus?

Cortical plate

White matter

Layer I

The occipital lobe

in this section is from

the opposite side of

the midline.

*

PLATE 96

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