front matter 1

Clarke's

column?

Floor plateFloor plate

Ventral horn

motoneurons

Ventral horn

motoneurons

Lateral horn

motoneurons

(autonomic)

Ventral horn

interneurons

Ventral horn

interneurons

Intermediate

interneurons

Intermediate

interneurons

Dorsal root bifurcation zone

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

Vestibulospinal tract?

Clarke's

column?

Lamina I

Superficial fasciculus gracilis

Deep fasciculus gracilis

Roof plateRoof plate

Central canalCentral canal

trunk?trunk?

VVentral funiculus entral funiculus

Dorsal median septum

Ventral median fissure

VVentral white commissureentral white commissure

VVentral gray commissureentral gray commissure

I

n

tr

aspi

n

a

l

t

r

a

c

t

s

?

I

n

tr

aspi

n

a

l

t

r

a

c

t

s

?

Sp

in

oc

ep

h

a

li

c

tr

a

c

ts

?

Sp

in

oc

ep

h

a

li

c

tr

a

c

ts

?

S p i n o c e r e b e l l

a

r

t

r

a

c

t

s

?

S p i n o c e r e b e l l

a

r

t

r

a

c

t

s

?

The fi ne lines in the lateral and ventral funiculi segregate regions of dif-

fering densities of proliferating glia, not the borders of fi ber tracts.

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 42B