front matter 1

Lumbar

enlargement

Cervical enlargement

Central canal (defines midline)

Thoracic area

Sacral area

Medial motor column (right)

Medial motor column (left)

Central and

lateral motor

columns

(cervical)

Central

and

lateral

motor

columns

(lumbar)

Autonomic

motor

columns

D

E

F

DORSAL

VENTRAL

GW14, CR 108 mm, Y68-65 FIGURE 26