front matter 1

foot?foot? foot?foot?

Floor plateFloor plate

VVentral funiculusentral funiculus

Ventral horn

motoneurons

Ventral horn

motoneurons

Ventral horn

interneurons

Ventral horn

interneurons

Intermediate

interneurons

Intermediate

interneurons

Dorsal root

bifurcation zone

Dorsal root

Ventral root

Dorsal root

collateralization zone

Lissauer's

tract?

Dorsal funiculus

Dorsal

horn

Substantia

gelatinosa

Substantia

gelatinosa

Lateral

funiculus

Lateral

funiculus

EpendymaEpendyma

Central autonomic areaCentral autonomic area

Laminae

IV-V

Laminae

IV-V

Lamina I

Fasciculus gracilis

Autonomic

motoneurons?

Autonomic

motoneurons? Roof plateRoof plate

Central canalCentral canal

lower

trunk?

lower

trunk?

thigh?thigh?

leleg?g?

ankle?ankle?

Dorsal median septum

Ventral median fissure

VVentral white commissureentral white commissure

VVentral gray commissureentral gray commissure

PLATE 45B

See Table III B-1 for the list of glial densities in each fi ber tract.

Examples of glial densities in each category are labeled in the lower

left corner of Plate 39B.