front matter 1

CR 8.0 mm, M2065

CR 10.5 mm, C6517

A

B

CR 8.0 mm, M2065

CR 10.5 mm, C6517

0.5 mm

1 mm

Floor

plate

Roof

plate

Central

canal

U

n

d

vi

id

e

d

n

e

u

ro

e

p

it

h

e

liu

m

U

n

d

vi

id

e

d

n

e

u

ro

e

p

it

h

e

liu

m

Gray

matter

Subdivided neuroepithelium

Dorsal

Inter-

mediate

Ventral

Subdivided

gray matter

Dorsal

horn

Intermediate

gray

Ventral

horn

Neuroepithelium and Gray Matter – GW5.25 to GW5.5 FIGURE 4