front matter 1

Floor plateFloor plate

Ventral horn

motoneurons

Ventral horn

motoneurons

Ventral horn

interneurons

Ventral horn

interneurons

Intermediate

interneurons

Intermediate

interneurons

Dorsal root bifurcation zone

Dorsal root

Ventral root

Dorsal root collateralization zone

Lissauer's tract??

Dorsal funiculus

Dorsal

horn

Substantia

gelatinosa

Substantia

gelatinosa

Lateral

funiculus

Lateral

funiculus

EpendymaEpendyma

Central autonomic areaCentral autonomic area

Laminae

IV-V

Laminae

IV-V

Lamina I

Fasciculus gracilis

VVentral funiculusentral funiculus

Roof plateRoof plate

Central canalCentral canal

lower

trunk?

lower

pelvic trunk?

girdle?

pelvic

girdle?

thigh?thigh?

thigh

and leg?

thigh

leleg?g? and leg?

ankle?ankle?

VVentral white commissureentral white commissure

VVentral gray commissureentral gray commissure

Dorsal median septum

Ventral median fissure

I

n

t

r

a s p i n a l

t r

a

c

t

s

I?

n

t

r

a s p i n a l

t r

a

c

t

s

?

Sp

in

o

ce

p

h

a

li

c

t

r

a

c

t

s

?

Sp

in

o

ce

p

h

a

li

c

t

r

a

c

t

s

?

?? ??

See Table III B-1 for the list of glial densities in each fi ber tract.

Examples of glial densities in each category are labeled in the lower

left corner of Plate 39B.

PLATE 43B