front matter 1

Floor plateFloor plate

Ventral funiculus

Central canal

Ventral horn motoneurons

Ventral horn moto-
neuron column
(lower trunk)

Ventral horn interneurons

Intermediate interneurons

Dorsal root bifurcation zone

Fasciculus gracilis Dorsal root collateralization zone

Lissauer's tract?

Dorsal

funiculus

Dorsal

horn Substantia

gelatinosa

Substantia gelatinosa

Lateral funiculus

EpendymaVentral neuroepithelium (glioepithelium?)

Central autonomic area

Lamina ILamina I

Laminae IV-V

Laminae IV-V Dorsal neuroepithelium

Ventral white commissure

Ventral median fissure

Retreating roof plate

Dorsal median septum

PLATE 28B