front matter 1

Sp

in

o

ce

p

h

a

li

c

t

r

a

c

ts

?

Sp

in

o

ce

p

h

a

li

c

t

r

a

c

ts

?

VVentral funiculusentral funiculus

VVentral grayentral gray

Intermediate grayIntermediate gray

Superficial fasciculus gracilis

Deep fasciculus gracilis

Dorsal root collateralization zone

Lateral

funiculus

Lateral

funiculus

Vestibulospinal tract?

Dorsal grayDorsal gray

Ventral rootlets

Ventral root

Dorsal funiculus

Dorsal root bifurcation zone

Lissauer's

tract

Myelinating terminals of

dorsal root collaterals

Ventral corticospinal tract

Lateral

corticospinal

tract

Lateral
reticulospinal
tract?

Lateral
reticulospinal
tract?

Central canal

surrounded by ependyma

Central canal

surrounded by ependyma

Intr

aspin

al

tr

a

c

t

s

?

Intr

aspin

al

tr

a

c

t

s

?

Incipient

subgelatinosal

plexus

Incipient

subgelatinosal

plexus

Reticulated

area

Reticulated

area

Myelinated proximal

axons of ventral horn

motoneurons

Myelinated proximal

axons of ventral horn

motoneurons

Dorsal median septum

Ventral median fissure

VVentral white commissureentral white commissure

VVentral gray commissureentral gray commissure

See the matched cell body stained section in Plates 74A and B

PLATE 73B