A
B
C
D E F G H I J
Central canal
(defines midlline)
Central and
lateral
motor columns
Medial motor
columns
Autonomic
motor columns
White matter
outlined
Gray matter
outlined
Columns 1 and 11
Columns 1 and 12
Columns 1 and 13
Columns 1 and 14
Columns 1 and 15
Columns 1 and
Autonomic
Columns 1 and 10
11
Central
canal
1010
(^12121111)
1313 1414
15
Figure 29. The lumbar and sacral regions
in specimen Y68-65 (GW14, CR 108 mm).
The individual sections (1781-2101) in
this model are diagrammed in Figure 25.
The reconstructed length is 11.2 mm after
fi xation. All panels show the model from
the top front. Panel A shows both the
white matter (outlined transparent enve-
lope) and gray matter (inner transparent
envelope) around the central canal (gray-
white solid) and motor columns (colored
solids). Panel B shows the gray matter
(outlined transparent envelope) around the
central canal and motor columns. Panel C
shows the central canal and all the motor
columns. The small side panels (D-J)
show various subsets of motor columns
with the central canal.
Figure 30. A continuation of the previous fi gure in the same specimen except that all panels show either the entire model or parts of it in a side view.
Motor column 1 (cyan, medial panel, ventral tier) may innervate axial muscles. It is bifurcated in the fi rst section (1781) and single in sections 1821 to
- The autonomic motor column (green) is in the fi rst two sections of the model (1781-1821) and contains the most posterior neurons that innervate
the sympathetic ganglia. The remaining motor columns (10-15) are present only at lumbar levels or upper sacral levels (sections 1781-2061). Columns
FIGURE 29 GW14, CR 108 mm, Y68-65