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)

D

E

F

DORSAL

VENTRAL

GW10.5, CR 56 mm, Y380-62 FIGURE 19