front matter 1

Spino c eph

al

ic

t

r

a

c

t

s

?

Spino c eph

al

ic

t

r

a

c

t

s

?

VVentral funiculusentral funiculus

Central canal surrounded

by ependyma

Central canal surrounded

by ependyma

Myelinated ventral rootlets

VVentral grayentral gray

Intermediate grayIntermediate gray

Superficial fasciculus gracilis

Deep fasciculus gracilis

Dorsal root collateralization zone

Lateral

funiculus

Lateral

funiculus

Dorsal grayDorsal gray

Dorsal funiculus

Myelinating terminals of

dorsal root collaterals

corticospinalLateral

tract

corticospinalLateral

tract

Vestibulospinal tract?

Dorsal root bifurcation zone

Lissauer's

tract

Incipient

subgelatinosal

plexus

Incipient

subgelatinosal

plexus

Reticulated

area

Reticulated

area

Myelinated proximal

axons of ventral horn

motoneurons

Myelinated proximal

axons of ventral horn

motoneurons

I n t r a s

pi

na

l t ra c

ts

?

I n t r a s

pi

na

l t ra c

ts

?

Dorsal median septum

Ventral

median

fissure

VVentral gray commissureentral gray commissure

VVentral white commissureentral white commissure

PLATE 58B

See the matched cell body stained section in Plates 59A and B