The Human Brain During the Third Trimester

Level 19: Section 1161

Level 20: Section 1201

PPonsons

Pontine gray

Pyramid

Inferior olive

Transpontine corticofugal tract

Inferior olive

Pontine gray

Corticospinal tract

Flocculus

Fourth ventricle

Middle cerebellar peduncle

Inferior cerebellar peduncle

Choroid plexus

Fourth ventricle

Choroid plexus

MedullaMedulla

GW30 Horizontal, CR 260 mm, Y187-65

1 External germinal layer (cerebellum)

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

CEREBELLUMCEREBELLUM

VVermisermis

HemispheHemispherree

1

MedullaMedulla

1

Inferior cerebellar peduncle

CEREBELLUMCEREBELLUM

VVermisermis

HemispheHemispherree

See high magnification view in Plates 148A and B.

See high magnification view in Plates 149A and B

(left panel).

PLATE 129