front matter 1

Floor plateFloor plate

Central canalCentral canal

Ventral horn

interneurons

Ventral horn

interneurons

Intermediate

interneurons

Intermediate

interneurons

Dorsal root

bifurcation zone

Dorsal root

bifurcation zone

Fasciculus cuneatus

Fasciculus gracilis

Dorsal root

collateralization zone

Lissauer's

tract?

Lissauer's

tract?

Dorsal funiculus

Dorsal

horn Substantia

gelatinosa

Substantia

gelatinosa

EpendymaEpendyma

Central

autonomic

area

Central

autonomic

area

Lateral

cervical

nucleus

Lateral

cervical

nucleus

Lamina ILamina I

Laminae

IV-V

Laminae

IV-V

Central

cervical

nucleus?

Central

cervical

nucleus?

Dorsal rootDorsal root

neck?neck?

arm and

shoulder?

arm and

shoulder?

arm and

forearm?

arm and

forearm?

wrist and

hand?

wrist and

hand?

Ventral

white

commissure

Ventral

white

commissure

Ventral

median fissure

Dorsal intermediate septum?

Retreating roof plate

Dorsal median septum

V

e

n

t

r

al

funi

culu s

V

e

n

t

r

al

funi

culu s

L a t e r a l f u n i c u l u s

L a t e r a l f u n i c u l u s

Ventral horn

motoneuron

columns

Ventral horn

motoneuron

columns

PLATE 23B