front matter 1

Lumbar

enlargement

Cervical enlargement

Central canal (defines midline)

Thoracic area

Sacral area

Medial motor column (right)

Medial motor column (left)

Lateral motor columns

(cervical)

Lateral motor

columns (lumbar)

D

E

F

DORSAL

VENTRAL

GW8.5, CR 36 mm, M2050 Side View FIGURE 12