front matter 1

Spi

no

ce

ph

a

li

c

t

r

a

c

t

s

?

Spi

no

ce

ph

a

li

c

t

r

a

c

t

s

?

VVentral funiculusentral funiculus

Central canal surrounded

by ependyma

Central canal surrounded

by ependyma

VVentral grayentral gray

Intermediate grayIntermediate gray

Dorsal root collateralization zone

Lateral

funiculus

Lateral

funiculus

Dorsal grayDorsal gray

Dorsal funiculus

Dark areas that are

likely edge artifact staining

Dorsal root bifurcation zone

Lissauer's

tract

Lateral

corticospinal

tract?

Lateral

corticospinal

tract?

Dorsal median septum Fasciculus gracilis

Ventral

median

fissure

VVentral gray commissureentral gray commissure

VVentral white commissureentral white commissure

I

nt

raspinal

tr

a

c

ts

?

I

nt

raspinal

tr

a

c

ts

?

The border of the lateral corticospinal tract is no longer
detectable in this section because the dorsal half of the
lateral funiculus has very sparse reactive glia. The fi ber
tracts at this level of the spinal cord are more immature
than the three rostral levels shown in this specimen.
Thus, the overall rostral (fi rst) to caudal (last) gradient of
maturation is evident in this third trimester specimen.

PLATE 60B

See the matched cell body stained section in Plates 61A and B