front matter 1

Spi

no

ce

ph

al

ic

tr

a

c

ts

Spi

no

ce

ph

al

ic

tr

a

c

ts

VVentral funiculusentral funiculus

VVentral grayentral gray

Intermediate grayIntermediate gray

Dorsal root bifurcation zone

Fasciculus gracilis

Dorsal root collateralization zone

Lissauer's tract

Lateral

funiculus

Lateral

funiculus

Spinocerebellar tractsSpinocerebellar tracts

Vestibulospinal tract?

Dorsal grayDorsal gray

Dorsal funiculus

Dorsal root

Clarke's

column

Clarke's

column

Central canal

surrounded by ependyma

Central canal

surrounded by ependyma

Lateral

corticospinal tract

Lateral

corticospinal tract

Myelinated terminals of

dorsal root collaterals

Intr

as

pi

n

al

tr

a

c

ts

Intr

as

pi

n

al

tr

a

c

ts

Subgelatinosal pleSubgelatinosal plexusxus

Reticulated areaReticulated area

Ventral white

commissure

Ventral white

commissure

VVentral gray commissureentral gray commissure

Dorsal median septum

Ventral

median fissure

Rubrospinal tract?Rubrospinal tract?

Lateral

reticulospinal

tract?

Lateral

reticulospinal

tract?

See the matched cell body stained section in Plates 99A and B

The ventral commissure stains darkly in this section, just as in Plate 96. A small ventral corticospinal tract may be

present on the right side in the unlabeled circular area bordering the ventral median fi ssure. All axons in the commis-

sure appear to be myelinated in this section. The ventral part of the lateral funiculus has a lightly stained area (contain-

ing late myelinating fi bers in the external parts of the spinocephalic tracts) sandwiched by dark staining medially

(containing early myelinating fi bers in the intraspinal and internal parts of the spinocephalic tracts) and dark staining

laterally (containing the early myelinating spinocerebellar fi bers).

PLATE 98B