The Human Brain During the Third Trimester

Inferior cerebellar

peduncle

Sim

pl

ex^

lob

ule

(H

VI

)

Sim

pl

ex^

lob

ule

(H

VI

)

Ansiform lobule

(Crus I HVIIA)

(damaged)

Ansiform lobu le

(Crus I HVIIA)

(damaged)

Ansiform

lobule

(Crus II HVIIA)

Ansiform

lobu le

(Crus II HVIIA)

Middle cerebellar peduncle

Nerve V (myelination gliosis in root)

Nerve V (myelination gliosis in root)

Fourth

ventricle

Fourth

ventricle

Fourth ventricle

(lateral recess)

Fourth ventricle

(lateral recess)

CEREBELLAR

HEMISPHERE

CEREBELLAR

HEMISPHERE

External germinal

layer

External germinal layer

(dorsal cochlear nucleus)

Glioepithelium

(middle cerebellar peduncle)

Myelination gliosis

(dorsal funiculus)

Germinal trigone (continuous with the

germinal source of the choroid plexus)

Prepositus

nucleus

Prepositus

nucleus

Raphe nuclear complexRaphe nuclear complex

Medial

longitudinal

fasciculus?

Medial

longitudinal

fasciculus?

Reticula

r

formatio

n

Reticula

r

fo

rmatio

n

Paramedian

lobule?

(HVIIB)

Paramedian

lobu le?

(HVIIB)

Flocculus

(HX)

Flocculus

(HX)

Biventral

lobule

(HVIII)

Biventra l

lobu le

(HVIII)

Tr anspontine corticofugal tract
(thick longitudinal bundles)

Pontocerebellar fiber s

(thin transve rse bundles)

Pontocerebellar fiber s

(decussation)

PONSPONS

MEDULLAMEDULLA

SPINAL CORD

Pontine

gray

Pontine

gray

Dorsal longitudinal

fasciculus

Dorsal longitudinal

fasciculus

Choroid

plexus

Choroid

plexus

Floccular peduncleFloccular peduncle

Dorsal cochlear nucleus

Cuneate fasciculus

Cuneate nucleus

Gracile fasciculus

Cuneate fasciculus

Lateral corticospinal tract

Central canal

Gracile fasciculus

Gracile nucleus

Ve ntral cochlear nucleus

Vestibular

nuclear

complex

Vestibular

nuclear

complex

M

idd

le^ c

ere

be

llar

pe

du

nc

le

M

idd

le^ c

ere

be

llar

pe

du

nc

le

Nerve VII?

(myelination

gliosis)

Nerve VII?

(myelination

gliosis)

NerNerve VII?ve VII?

NerNerve V?ve V?

Nerve VI?

(myelination

gliosis)

Nerve VI?

(myelination

gliosis)

Spinal nucleus

and tract? (V)

Spinal nucleus

and tract? (V)

Superior olive

complex

Superior olive

complex

Trapezoid body and

medial lemniscus

Tr apezoid body and

medial lemniscus

R

te

ic

u

al

r

te

g

m

en

ta

ln

u

cl

eu

s

R

te

ic

u

al

r

te

g

m

en

ta

ln

u

cl

eu

s

Inferior cerebellar

peduncle

Anterior lobe?

(HI-HV)

R

formeticular

atio

n

R

formeticular

atio

n

Medullary glio-

epithelium/ependyma

Medullary glio-

epithelium/ependyma

Germinal and transitional

structures in italics

Germinal and transitional

structures in italics

PLATE 240B