front matter 1

Spin

oce

ph

al

ic

tr

a

c

ts

Spin

oce

ph

al

ic

tr

a

c

ts

VVentral funiculusentral funiculus

Ventral corticospinal tract?

VVentral grayentral gray

Intermediate grayIntermediate gray

Dorsal root

bifurcation zone

Fasciculus cuneatus

Fasciculus gracilis

Dorsal root

collateralization zone

Lissauer's tract

Lateral

funiculus

Lateral

funiculus

Tectospinal tract?

Medial longitudinal fasciculus?

Vestibulospinal tract?

Dorsal

gray

Dorsal

gray

Myelinated

terminals of

dorsal root

collaterals

Myelinated

terminals of

dorsal root

collaterals

Damaged area in sectionDamaged area in section

Dorsal funiculus

Lateral corticospinal tract

(myelinating)

(myelinaed)

Central canal

surrounded by ependyma

Central canal

surrounded by ependyma

In

traspinal tr

ac

ts

In

traspinal tr

ac

ts

S

p

in

o

ce

re

b

e

ll

a

r

tr

a

c

t

s

S

p

in

o

ce

re

b

e

ll

a

r

tr

a

c

t

s

Myelinated axons from
dorsal root afferents,
intraspinal tract afferents,
and ventral motoneuron efferents

myelination

gradient

myelination

gradient

Subgelatinosal pleSubgelatinosal plexusxus

Reticulated areaReticulated area

Ventral median fissure

Dorsal median septum

Dorsal intermediate septum

VVentral gray commissureentral gray commissure

VVentral white commissureentral white commissure

Lateral

reticulospinal

tract?

Lateral

reticulospinal

tract?

See the matched cell body stained section in Plates 107A and B

PLATE 106B