The Human Brain During the Third Trimester

Fusiform

gyrus

Fusiform

gyrus

Occipital

gyrus

Occipital

gyrus

F

ourth

ventricle

Lateral lemniscus

Layer I

Layer II

(stellate cell islands)

Layer III

Entorhinal cortical plate

Layer IV

(lamina dessicans)

Layers V- VI

VENTRAL

HIPPOCAMPUS

VENTRAL

HIPPOCAMPUS

Mesencephalic nucleus (VMesencephalic nucleus (V))

Locus coeruleuLocus coeruleuss

Motor nucleus (VII)

Inferior

cerebellar

peduncle?

Inferior

cerebellar

peduncle?

Medial longitudinal fasciculus

and tectospinal tract

Medial longitudinal fasciculus

and tectospinal tract

Dorsal longitudinal fasciculuDorsal longitudinal fasciculuss

Lateral migratory streamLateral migratory streamLateral migratory streamLateral migratory stream

Reticular Reticular ffo rmationormation

Transpontine corticofugal tract

Medial lemniscus, spinocephalic,

and trigemino-thalamic tracts

Pontine gray

Middle cerebellar peduncle

Pontocerebellar fibers (decussation

Pontocerebellar fibers

Culmen

(IV-V)

Culmen

(IV-V)

Declive

(VI)

Declive

(VI)

Lingula

(I-II)

Lingula

(I-II)

Simplex lobule

(HVI)

Simplex lobu le

(HVI)

Centralis

(III)

Centralis

(III)

Anterior lobe

(HIV-HV )

Anterior lobe

(HIV-HV )

Superior cerSuperior cerebellar peduncleebellar peduncle

SubiculuSubiculumm

Raphe nuclear

complex

Raphe nuclear

complex

R

te

ic

lu

ar

te

gm

en

ta

ln

uc

le

us

R

te

ic

lu

ar

te

gm

en

ta

ln

uc

le

us

PParabrachial nucleusarabrachial nucleus

Principal sensory nucleus (V)

E

nt

o r hi n

a

l

c

o

r

t

e

x

E

nt

o r hi n

a

l

c

o

r

t

e

x

En

tor

hi

na

lc

or

te

x

En

tor

hi

na

lc

or

te

x

PP O N SO N S

Primary

fissure

Primary

fissure

Tear in se

ction

Tear in se

ction

Tea

r (^) in
(^) sec
tion
Tea
r (^) in
(^) sec
tion
Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics
CEREBELLUM
VVermisermis
HemispheHemispherree
Alvear
glioepithelium
Alve ar
glioepithelium
Subpial
granular
layer
Subpial
granular
layer
External
germinal
layer
Pa rahippocampal neuroepithelium and subventricular zone
Pa rahippocampal stratified transitional field
Neocortical plate
White matter
Layer I
Layer II
Layer III
Layer IV
Layers V-VI
PParaharahipipppoocacammppal gyal gyruruss
InInferioferior temr temppooraral gyl gyruruss
PPontine glioepithelium/ependymaontine glioepithelium/ependyma
Amygdaloid
glioepithelium/ependyma
Amygdaloid
glioepithelium/ependyma
PLATE 144B