The Human Brain During the Third Trimester

F

ourth

ventricl

e

Late

ral

lemn

iscu

s

Late

ral

lemn

iscu

s

La

te

ra

l^ l

em

ni

sc

us

La

te

ra

l^ l

em

ni

sc

us

Nerve V

Moto r

nucleus (VII)

Moto r

nucleus (VII)

Moto r

nucleus (VII)

Moto r

nucleus (VII)

Abducens

nucleus (VI)

Abducens

nucleus (VI)

Superior olSuperior olive complexive complex

Superior olSuperior olive compleive complexx

Medial longitudinal

fasciculus and

tectospinal tract

Medial longitudinal

fasciculus and

tectospinal tract

Dorsal

longitudinal

fasciculus

Dorsal

longitudinal

fasciculus

Transpontine corticofugal tract Reticular Reticular ffo rmationormation

M

ed

ia

l^

le

m

n

is

cu

s

a

n

d^

tr

ap

ez

o

id

b

o

d

y

M

ed

ia

l^

le

m

n

is

cu

s

a

n

d^

tr

ap

ez

o

id

b

o

d

y

Pontine gray

Middle cerebellar peduncle

Pontocerebellar fibers (decussation)

Pontocerebellar fibers

Pyramis

(VIII)

Pyramis

(VIII)

Tuber

(VIIa)

Tuber

(VIIa)

Nodulus

(X)

Nodulus

(X)

Uvula

(IX)

Uvula

(IX)

Simplex lobule

(HVI)

Simplex lobu le

(HVI)

Simplex lobule

(HVI)

Simplex lobu le

(HVI)

Anterior lobe

(HIV-HV )

Anterior lobe

(HIV-HV )

Anterior lobe

(HIV-HV )

Anterior lobe

(HIV-HV )

Raphe nuclear

complex

Raphe nuclear

complex

Spinal nucleus

and tract (V)

Spinal nucleus

and tract (V)

Spinal nucleus

and tract (V)

Spinal nucleus

and tract (V)

P O N SP O N S

Primary

fissure

Primary

fissure

Dentate nucleuDentate nucleuss

Interpositus

nucleus

Interpositus

nucleus

Folium

(VIIa)

Fo lium

(VIIa)

Crus I,

ansiform lobule

(HVIIA)

Crus I,

ansiform lobu le

(HVIIA)

Crus I,

ansiform lobule

(HVIIA)

Crus I,

ansiform lobu le

(HVIIA)

T

ear in section

T

ear in section

Middle cerebel

lar

pe

du

nc

le

Middle cerebel

lar

pe

du

nc

le

Superiorcerebellarpe

duncle

Superiorcerebellarpe

duncle

SSuuppeerriioorrcceerreebbeellllaarrppeedduunnccllee

M

id

dl

e

ce

re

bel

lar

ped

uncle

M

id

dl

e

ce

re

bel

lar

ped

uncle

R

et

ic

ul

a

r

te

g

m

e

n

ta

ln

u

cl

eu

s

R

et

ic

ul

a

r

te

g

m

e

n

ta

ln

u

cl

eu

s

In

fe

ri

or

ce

re

be

ll

ar

p

ed

u

n

cl

e

In

fe

ri

or

ce

re

be

ll

ar

p

ed

u

n

cl

e

Vestibular

nuclear

complex

Vestibular

nuclear

complex

Vestibular

nuclear

complex

Vestibular

nuclear

complex

Choroid

plexus

Choroid

plexus

Inferior

cerebellar

peduncle

Inferior

cerebellar

peduncle

Dorsal cochlear nucleusDorsal cochlear nucleus

Dorsal cochlear nucleusDorsal cochlear nucleus

Nerve VII

(genu)

Nerve VII

(genu)

Fourth ventricle

(lateral recess)

Germinal

trigone

External germinal layer

External germinal layer

CEREBELLUM

VVermisermis

HemispheHemispherree

Germinal and transitional structuGerminal and transitional structurres ines in italicsitalics

DEEP NUCLEIDEEP NUCLEI

PPontine glioepithelium/ependymaontine glioepithelium/ependyma

PLATE 146B