front matter 1

A

B

C

D E F G H I

Central canal

(defines midlline)

Central and

lateral

motor columns

Medial motor

columns

White matter

outlined

Gray matter

outlined

Columns 1 and 4

Columns 1 and 5

Columns 1 and 6

Columns 1 and 7, 8, 9

Columns 1 and 2

Columns 1 and 3

11

22

33

66

77

88

99

44

55

Central

canal

Figure 27. The top front view of the cervical region in specimen Y68-65 (GW14, CR 108 mm). The individual sections (701-1061) in this model are
diagrammed in Figure 23. The length of the cervical region is 12.6 mm after fi xation. All panels show the entire model or parts of it from the top front.
Panel A shows both the white matter (outlined transparent envelope) and gray matter (inner transparent envelope) around the central canal (gray-white
solid) and motor columns (colored solids). Panel B shows only the gray matter (outlined transparent envelope) around the central canal and motor
columns. Panel C shows the central canal and all motor columns alone. Subsets of motor columns are shown in the small side panels D-I.

FIGURE 27 GW14, CR 108 mm, Y68-65