front matter 1

VVentral funiculusentral funiculus Ventral horn

motoneurons?

Ventral horn interneurons

Intermediate interneurons

Dorsal root bifurcation zone

Dorsal root collateralization zone

Dorsal median septum Fasciculus gracilis

Ventral median fissure

Lissauer's tract

Dorsal funiculus

Dorsal

horn

Substantia gelatinosa

Lateral

funiculus

Lateral

funiculus

Central autonomic areaCentral autonomic area

Lamina ILamina I

Laminae IV-V

Central canal surrounded by ependyma

VVentral gray commissureentral gray commissure

VVentral white commissureentral white commissure

Lateral corticospinal tract?

lower trunk?

Refer to the matching myelin stained section for the approximate locations of the intraspi- nal and spinocephalic tracts.

PLATE 61B

See the matched myelin stained section in Plates 60A and B