front matter 1

Spi

no

ce

ph

a

li

c

tr

a

c

ts

?

Spi

no

ce

ph

a

li

c

tr

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

Lateral
corticospinal
tract

Lateral
corticospinal
tract
Clarke's
column

Clarke's

column

Vestibulospinal tract

Dorsal grayDorsal gray

Dorsal funiculus

Myelinating terminals

of dorsal root collaterals

Central canal with

surrounding ependyma

Dorsal root

bifurcation zone

Lissauer's

tract

Lissauer's

tract

Incipient

subgelatinosal

plexus

Incipient

subgelatinosal

plexus

Reticulated

area

Reticulated

area

I

n

tr

aspina

l

tr

a

c

ts

?

I

n

tr

aspina

l

tr

a

c

ts

?

S

p

in

o

c

e

re

b

e

ll

a

r

tr

a

c

t

s

?

S

p

in

o

c

e

re

b

e

ll

a

r

tr

a

c

t

s

?

Dorsal median septum

Ventral

median

fissure

VVentral gray commissureentral gray commissure

VVentral white commissureentral white commissure

The increased density of the myelin stain that was interpreted to be the rubrospi-

nal and lateral reticulospinal tracts in Plate 54 cannot be detected in this section,

so these fi ber tracts are not labeled. However, the medial and central fi bers in the

intraspinal tracts have a greater staining density than the dorsolateral parts. That

same gradient is seen in the thoracic cord of the GW26 specimen (Plate 51).

PLATE 56B

See the matched cell body stained section in Plates 57A and B