The Human Brain During the Third Trimester

GW29 Coronal

CR 260 mm

Y14-59

Level 16: Section 1261

Postcentral gyrus?

Cingulate

gyrus

Cingulum

Induseum

griseum

Supramarginal/

angular gyri

Superior parietal lobu le

Middle

temporal

gyrus

Inferior

temporal

gyrus?

Occipital

gyrus

Occipital

gyrus

Fusiform

gyrus?

Fusiform

gyrus?

Pyramid (corticospinal tract)

Ve ntral cochlear nucleus

Choroid plexus

Choroid

plexus

Choroid

plexus

Fourth

ventricle

Vestibular

nuclear

complex

Vestibu lar

nuclear

complex

C

er

eb

el

lu

m

(h

em

is

ph

er

e)

C

er

eb

el

lu

m

(h

em

is

ph

er

e)

Dorsal cochlear nucleus

Inferior olive complex

Spinal nucleus and tract (V)

Prepositus nucleus

Medial lemniscus

Superior cerebellar peduncle

Raphe nuclear complex

Interhemi-

spheric fissure

Interhemi-

spheric fissure

Parietal

lobe

Parietal

lobe

Temporal

lobe

Te mporal

lobe

Lateral

ventricle

Lateral

ventricle

MedullaMedulla

SSuubbiiccuulluumm

Parahippo-

campal gyrus

Inferior

colliculus

Inferior

colliculus

Reticular

formatio

n

Reticular

formatio

n

Cerebellum

(vermis)

Cere bellum

(vermis)

Midbrain

tectum

Middle cerebellar peduncle

Inferior cerebellar peduncle

FimbriaFimbria

Hippocampus

Occipital

lobe

Occipital

lobe

Am

m

on

's

horn

Am

m

on

's

horn

Co

rp

us

ca

llo

su

m

(spleniu

m)

Co

rp

us

ca

llo

su

m

(spleniu

m)

1 Pa rietal neuroepithelium and subventricular zone

2 Pa rietal stratified transitional field

5 Po sterior striatal neuroepithelium and subventricular zone

13 External germinal layer (cerebellum)

12 Pontine and medullary glioepithelium/ependyma

11 Te mporal stratified transitional field

9 Occipital stratified transitional field

8 Occipital neuroepithelium and subventricular zone

10 Te mporal neuroepithelium and subventricular zone

6 Alve ar glioepithelium

3 Callosal glioepithelium

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

7 Subgranular zone (dentate)

33

11

22

55

66

88

99

77

1212

13

14

1111

1010

Dentate gyrus

Lateral

fissure

Layer I

Cortical plate

White matter

See detail of brain core and cerebellum

in Plates 187A and B.

PPonsons

Hippocampal

commissure

Hippocampal

commissure

4 Fi mbrial glioepithelium

44

14 Subpial granular layer (cortical)

PrPrecuneusecuneus

PrPrecuneusecuneus

PLATE 166